[PATCH] powerpc: Merge bitops.h

Here's a revised version.  This re-introduces the set_bits() function
from ppc64, which I removed because I thought it was unused (it exists
on no other arch).  In fact it is used in the powermac interrupt code
(but not on pSeries).

- We use LARXL/STCXL macros to generate the right (32 or 64 bit)
  instructions, similar to LDL/STL from ppc_asm.h, used in fpu.S

- ppc32 previously used a full "sync" barrier at the end of
  test_and_*_bit(), whereas ppc64 used an "isync".  The merged version
  uses "isync", since I believe that's sufficient.

- The ppc64 versions of then minix_*() bitmap functions have changed
  semantics.  Previously on ppc64, these functions were big-endian
  (that is bit 0 was the LSB in the first 64-bit, big-endian word).
  On ppc32 (and x86, for that matter, they were little-endian.  As far
  as I can tell, the big-endian usage was simply wrong - I guess
  no-one ever tried to use minixfs on ppc64.

- On ppc32 find_next_bit() and find_next_zero_bit() are no longer
  inline (they were already out-of-line on ppc64).

- For ppc64, sched_find_first_bit() has moved from mmu_context.h to
  the merged bitops.  What it was doing in mmu_context.h in the first
  place, I have no idea.

- The fls() function is now implemented using the cntlzw instruction
  on ppc64, instead of generic_fls(), as it already was on ppc32.

- For ARCH=ppc, this patch requires adding arch/powerpc/lib to the
  arch/ppc/Makefile.  This in turn requires some changes to
  arch/powerpc/lib/Makefile which didn't correctly handle ARCH=ppc.

Built and running on G5.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/ppc_ksyms.c

@@ -81,15 +81,6 @@ EXPORT_SYMBOL(_prep_type);
 EXPORT_SYMBOL(ucSystemType);
 #endif
 
-#if !defined(__INLINE_BITOPS)
-EXPORT_SYMBOL(set_bit);
-EXPORT_SYMBOL(clear_bit);
-EXPORT_SYMBOL(change_bit);
-EXPORT_SYMBOL(test_and_set_bit);
-EXPORT_SYMBOL(test_and_clear_bit);
-EXPORT_SYMBOL(test_and_change_bit);
-#endif /* __INLINE_BITOPS */
-
 EXPORT_SYMBOL(strcpy);
 EXPORT_SYMBOL(strncpy);
 EXPORT_SYMBOL(strcat);

arch/powerpc/lib/Makefile

@@ -3,13 +3,14 @@
 #
 
 ifeq ($(CONFIG_PPC_MERGE),y)
-obj-y			:= string.o
+obj-y			:= string.o strcase.o
+obj-$(CONFIG_PPC32)	+= div64.o copy_32.o checksum_32.o
 endif
 
-obj-y			+= strcase.o
-obj-$(CONFIG_PPC32)	+= div64.o copy_32.o checksum_32.o
+obj-y			+= bitops.o
 obj-$(CONFIG_PPC64)	+= checksum_64.o copypage_64.o copyuser_64.o \
-			   memcpy_64.o usercopy_64.o mem_64.o string.o
+			   memcpy_64.o usercopy_64.o mem_64.o string.o \
+			   strcase.o
 obj-$(CONFIG_PPC_ISERIES) += e2a.o
 obj-$(CONFIG_XMON)	+= sstep.o
 

arch/ppc64/kernel/bitops.c → arch/powerpc/lib/bitops.c

-/*
- * These are too big to be inlined.
- */
-
-#include <linux/kernel.h>
+#include <linux/types.h>
 #include <linux/module.h>
-#include <linux/bitops.h>
 #include <asm/byteorder.h>
+#include <asm/bitops.h>
 
-unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
+/**
+ * find_next_bit - find the next set bit in a memory region
+ * @addr: The address to base the search on
+ * @offset: The bitnumber to start searching at
+ * @size: The maximum size to search
+ */
+unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
 			    unsigned long offset)
 {
-	const unsigned long *p = addr + (offset >> 6);
-	unsigned long result = offset & ~63UL;
+	const unsigned long *p = addr + BITOP_WORD(offset);
+	unsigned long result = offset & ~(BITS_PER_LONG-1);
 	unsigned long tmp;
 
 	if (offset >= size)
 		return size;
 	size -= result;
-	offset &= 63UL;
+	offset %= BITS_PER_LONG;
 	if (offset) {
 		tmp = *(p++);
-		tmp |= ~0UL >> (64 - offset);
-		if (size < 64)
+		tmp &= (~0UL << offset);
+		if (size < BITS_PER_LONG)
 			goto found_first;
-		if (~tmp)
+		if (tmp)
 			goto found_middle;
-		size -= 64;
-		result += 64;
+		size -= BITS_PER_LONG;
+		result += BITS_PER_LONG;
 	}
-	while (size & ~63UL) {
-		if (~(tmp = *(p++)))
+	while (size & ~(BITS_PER_LONG-1)) {
+		if ((tmp = *(p++)))
 			goto found_middle;
-		result += 64;
-		size -= 64;
+		result += BITS_PER_LONG;
+		size -= BITS_PER_LONG;
 	}
 	if (!size)
 		return result;
 	tmp = *p;
 
 found_first:
-	tmp |= ~0UL << size;
-	if (tmp == ~0UL)	/* Are any bits zero? */
+	tmp &= (~0UL >> (64 - size));
+	if (tmp == 0UL)		/* Are any bits set? */
 		return result + size;	/* Nope. */
 found_middle:
-	return result + ffz(tmp);
+	return result + __ffs(tmp);
 }
+EXPORT_SYMBOL(find_next_bit);
 
-EXPORT_SYMBOL(find_next_zero_bit);
-
-unsigned long find_next_bit(const unsigned long *addr, unsigned long size,
+/*
+ * This implementation of find_{first,next}_zero_bit was stolen from
+ * Linus' asm-alpha/bitops.h.
+ */
+unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size,
 				 unsigned long offset)
 {
-	const unsigned long *p = addr + (offset >> 6);
-	unsigned long result = offset & ~63UL;
+	const unsigned long *p = addr + BITOP_WORD(offset);
+	unsigned long result = offset & ~(BITS_PER_LONG-1);
 	unsigned long tmp;
 
 	if (offset >= size)
 		return size;
 	size -= result;
-	offset &= 63UL;
+	offset %= BITS_PER_LONG;
 	if (offset) {
 		tmp = *(p++);
-		tmp &= (~0UL << offset);
-		if (size < 64)
+		tmp |= ~0UL >> (BITS_PER_LONG - offset);
+		if (size < BITS_PER_LONG)
 			goto found_first;
-		if (tmp)
+		if (~tmp)
 			goto found_middle;
-		size -= 64;
-		result += 64;
+		size -= BITS_PER_LONG;
+		result += BITS_PER_LONG;
 	}
-	while (size & ~63UL) {
-		if ((tmp = *(p++)))
+	while (size & ~(BITS_PER_LONG-1)) {
+		if (~(tmp = *(p++)))
 			goto found_middle;
-		result += 64;
-		size -= 64;
+		result += BITS_PER_LONG;
+		size -= BITS_PER_LONG;
 	}
 	if (!size)
 		return result;
 	tmp = *p;
 
 found_first:
-	tmp &= (~0UL >> (64 - size));
-	if (tmp == 0UL)		/* Are any bits set? */
+	tmp |= ~0UL << size;
+	if (tmp == ~0UL)	/* Are any bits zero? */
 		return result + size;	/* Nope. */
 found_middle:
-	return result + __ffs(tmp);
+	return result + ffz(tmp);
 }
-
-EXPORT_SYMBOL(find_next_bit);
+EXPORT_SYMBOL(find_next_zero_bit);
 
 static inline unsigned int ext2_ilog2(unsigned int x)
 {
@@ -106,8 +110,8 @@ static inline unsigned int ext2_ffz(unsigned int x)
 	return rc;
 }
 
-unsigned long find_next_zero_le_bit(const unsigned long *addr, unsigned long size,
-				    unsigned long offset)
+unsigned long find_next_zero_le_bit(const unsigned long *addr,
+				    unsigned long size, unsigned long offset)
 {
 	const unsigned int *p = ((const unsigned int *)addr) + (offset >> 5);
 	unsigned int result = offset & ~31;
@@ -143,5 +147,4 @@ unsigned long find_next_zero_le_bit(const unsigned long *addr, unsigned long siz
 found_middle:
 	return result + ext2_ffz(tmp);
 }
-
 EXPORT_SYMBOL(find_next_zero_le_bit);

arch/ppc/Makefile

@@ -66,7 +66,8 @@ head-$(CONFIG_PPC_FPU)		+= arch/powerpc/kernel/fpu.o
 core-y				+= arch/ppc/kernel/ arch/powerpc/kernel/ \
 				   arch/ppc/platforms/ \
 				   arch/ppc/mm/ arch/ppc/lib/ \
-				   arch/ppc/syslib/ arch/powerpc/sysdev/
+				   arch/ppc/syslib/ arch/powerpc/sysdev/ \
+				   arch/powerpc/lib/
 core-$(CONFIG_4xx)		+= arch/ppc/platforms/4xx/
 core-$(CONFIG_83xx)		+= arch/ppc/platforms/83xx/
 core-$(CONFIG_85xx)		+= arch/ppc/platforms/85xx/

arch/ppc/kernel/bitops.c

-/*
- * Copyright (C) 1996 Paul Mackerras.
- */
-
-#include <linux/kernel.h>
-#include <linux/bitops.h>
-
-/*
- * If the bitops are not inlined in bitops.h, they are defined here.
- *  -- paulus
- */
-#if !__INLINE_BITOPS
-void set_bit(int nr, volatile void * addr)
-{
-	unsigned long old;
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-	
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%3 \n\
-	or	%0,%0,%2 \n"
-	PPC405_ERR77(0,%3)
-"	stwcx.	%0,0,%3 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc" );
-}
-
-void clear_bit(int nr, volatile void *addr)
-{
-	unsigned long old;
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%3 \n\
-	andc	%0,%0,%2 \n"
-	PPC405_ERR77(0,%3)
-"	stwcx.	%0,0,%3 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
-}
-
-void change_bit(int nr, volatile void *addr)
-{
-	unsigned long old;
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%3 \n\
-	xor	%0,%0,%2 \n"
-	PPC405_ERR77(0,%3)
-"	stwcx.	%0,0,%3 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
-}
-
-int test_and_set_bit(int nr, volatile void *addr)
-{
-	unsigned int old, t;
-	unsigned int mask = 1 << (nr & 0x1f);
-	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%4 \n\
-	or	%1,%0,%3 \n"
-	PPC405_ERR77(0,%4)
-"	stwcx.	%1,0,%4 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=&r" (t), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
-
-	return (old & mask) != 0;
-}
-
-int test_and_clear_bit(int nr, volatile void *addr)
-{
-	unsigned int old, t;
-	unsigned int mask = 1 << (nr & 0x1f);
-	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%4 \n\
-	andc	%1,%0,%3 \n"
-	PPC405_ERR77(0,%4)
-"	stwcx.	%1,0,%4 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=&r" (t), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
-
-	return (old & mask) != 0;
-}
-
-int test_and_change_bit(int nr, volatile void *addr)
-{
-	unsigned int old, t;
-	unsigned int mask = 1 << (nr & 0x1f);
-	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%4 \n\
-	xor	%1,%0,%3 \n"
-	PPC405_ERR77(0,%4)
-"	stwcx.	%1,0,%4 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=&r" (t), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
-
-	return (old & mask) != 0;
-}
-#endif /* !__INLINE_BITOPS */

arch/ppc64/kernel/Makefile

@@ -13,7 +13,7 @@ endif
 
 obj-y               +=	irq.o idle.o dma.o \
 			signal.o \
-			align.o bitops.o pacaData.o \
+			align.o pacaData.o \
 			udbg.o ioctl32.o \
 			rtc.o \
 			cpu_setup_power4.o \

include/asm-ppc64/bitops.h → include/asm-powerpc/bitops.h

 /*
- * PowerPC64 atomic bit operations.
- * Dave Engebretsen, Todd Inglett, Don Reed, Pat McCarthy, Peter Bergner,
- * Anton Blanchard
+ * PowerPC atomic bit operations.
  *
- * Originally taken from the 32b PPC code.  Modified to use 64b values for
- * the various counters & memory references.
+ * Merged version by David Gibson <david@gibson.dropbear.id.au>.
+ * Based on ppc64 versions by: Dave Engebretsen, Todd Inglett, Don
+ * Reed, Pat McCarthy, Peter Bergner, Anton Blanchard.  They
+ * originally took it from the ppc32 code.
  *
- * Bitops are odd when viewed on big-endian systems.  They were designed
- * on little endian so the size of the bitset doesn't matter (low order bytes
- * come first) as long as the bit in question is valid.
+ * Within a word, bits are numbered LSB first.  Lot's of places make
+ * this assumption by directly testing bits with (val & (1<<nr)).
+ * This can cause confusion for large (> 1 word) bitmaps on a
+ * big-endian system because, unlike little endian, the number of each
+ * bit depends on the word size.
  *
- * Bits are "tested" often using the C expression (val & (1<<nr)) so we do
- * our best to stay compatible with that.  The assumption is that val will
- * be unsigned long for such tests.  As such, we assume the bits are stored
- * as an array of unsigned long (the usual case is a single unsigned long,
- * of course).  Here's an example bitset with bit numbering:
- *
- *   |63..........0|127........64|195.......128|255.......196|
- *
- * This leads to a problem. If an int, short or char is passed as a bitset
- * it will be a bad memory reference since we want to store in chunks
- * of unsigned long (64 bits here) size.
- *
- * There are a few little-endian macros used mostly for filesystem bitmaps,
- * these work on similar bit arrays layouts, but byte-oriented:
+ * The bitop functions are defined to work on unsigned longs, so for a
+ * ppc64 system the bits end up numbered:
+ *   |63..............0|127............64|191...........128|255...........196|
+ * and on ppc32:
+ *   |31.....0|63....31|95....64|127...96|159..128|191..160|223..192|255..224|
  *
+ * There are a few little-endian macros used mostly for filesystem
+ * bitmaps, these work on similar bit arrays layouts, but
+ * byte-oriented:
  *   |7...0|15...8|23...16|31...24|39...32|47...40|55...48|63...56|
  *
- * The main difference is that bit 3-5 in the bit number field needs to be
- * reversed compared to the big-endian bit fields. This can be achieved
- * by XOR with 0b111000 (0x38).
+ * The main difference is that bit 3-5 (64b) or 3-4 (32b) in the bit
+ * number field needs to be reversed compared to the big-endian bit
+ * fields. This can be achieved by XOR with 0x38 (64b) or 0x18 (32b).
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -37,11 +33,13 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#ifndef _PPC64_BITOPS_H
-#define _PPC64_BITOPS_H
+#ifndef _ASM_POWERPC_BITOPS_H
+#define _ASM_POWERPC_BITOPS_H
 
 #ifdef __KERNEL__
 
+#include <linux/compiler.h>
+#include <asm/atomic.h>
 #include <asm/synch.h>
 
 /*
@@ -50,71 +48,85 @@
 #define smp_mb__before_clear_bit()	smp_mb()
 #define smp_mb__after_clear_bit()	smp_mb()
 
-static __inline__ int test_bit(unsigned long nr, __const__ volatile unsigned long *addr)
-{
-	return (1UL & (addr[nr >> 6] >> (nr & 63)));
-}
-
-static __inline__ void set_bit(unsigned long nr, volatile unsigned long *addr)
+#define BITOP_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
+#define BITOP_WORD(nr)		((nr) / BITS_PER_LONG)
+#define BITOP_LE_SWIZZLE	((BITS_PER_LONG-1) & ~0x7)
+
+#ifdef CONFIG_PPC64
+#define LARXL		"ldarx"
+#define STCXL		"stdcx."
+#define CNTLZL		"cntlzd"
+#else
+#define LARXL		"lwarx"
+#define STCXL		"stwcx."
+#define CNTLZL		"cntlzw"
+#endif
+
+static __inline__ void set_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long old;
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	__asm__ __volatile__(
-"1:	ldarx	%0,0,%3		# set_bit\n\
-	or	%0,%0,%2\n\
-	stdcx.	%0,0,%3\n\
-	bne-	1b"
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
+"1:"	LARXL "	%0,0,%3	# set_bit\n"
+	"or	%0,%0,%2\n"
+	PPC405_ERR77(0,%3)
+	STCXL "	%0,0,%3\n"
+	"bne-	1b"
+	: "=&r"(old), "=m"(*p)
+	: "r"(mask), "r"(p), "m"(*p)
+	: "cc" );
 }
 
-static __inline__ void clear_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ void clear_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long old;
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	__asm__ __volatile__(
-"1:	ldarx	%0,0,%3		# clear_bit\n\
-	andc	%0,%0,%2\n\
-	stdcx.	%0,0,%3\n\
-	bne-	1b"
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
+"1:"	LARXL "	%0,0,%3	# set_bit\n"
+	"andc	%0,%0,%2\n"
+	PPC405_ERR77(0,%3)
+	STCXL "	%0,0,%3\n"
+	"bne-	1b"
+	: "=&r"(old), "=m"(*p)
+	: "r"(mask), "r"(p), "m"(*p)
+	: "cc" );
 }
 
-static __inline__ void change_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ void change_bit(int nr, volatile unsigned long *addr)
 {
 	unsigned long old;
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	__asm__ __volatile__(
-"1:	ldarx	%0,0,%3		# change_bit\n\
-	xor	%0,%0,%2\n\
-	stdcx.	%0,0,%3\n\
-	bne-	1b"
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
+"1:"	LARXL "	%0,0,%3	# set_bit\n"
+	"xor	%0,%0,%2\n"
+	PPC405_ERR77(0,%3)
+	STCXL "	%0,0,%3\n"
+	"bne-	1b"
+	: "=&r"(old), "=m"(*p)
+	: "r"(mask), "r"(p), "m"(*p)
+	: "cc" );
 }
 
-static __inline__ int test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ int test_and_set_bit(unsigned long nr,
+				       volatile unsigned long *addr)
 {
 	unsigned long old, t;
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	__asm__ __volatile__(
 	EIEIO_ON_SMP
-"1:	ldarx	%0,0,%3		# test_and_set_bit\n\
-	or	%1,%0,%2 \n\
-	stdcx.	%1,0,%3 \n\
-	bne-	1b"
+"1:"	LARXL "	%0,0,%3		# test_and_set_bit\n"
+	"or	%1,%0,%2 \n"
+	PPC405_ERR77(0,%3)
+	STCXL "	%1,0,%3 \n"
+	"bne-	1b"
 	ISYNC_ON_SMP
 	: "=&r" (old), "=&r" (t)
 	: "r" (mask), "r" (p)
@@ -123,18 +135,20 @@ static __inline__ int test_and_set_bit(unsigned long nr, volatile unsigned long
 	return (old & mask) != 0;
 }
 
-static __inline__ int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ int test_and_clear_bit(unsigned long nr,
+					 volatile unsigned long *addr)
 {
 	unsigned long old, t;
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	__asm__ __volatile__(
 	EIEIO_ON_SMP
-"1:	ldarx	%0,0,%3		# test_and_clear_bit\n\
-	andc	%1,%0,%2\n\
-	stdcx.	%1,0,%3\n\
-	bne-	1b"
+"1:"	LARXL "	%0,0,%3		# test_and_clear_bit\n"
+	"andc	%1,%0,%2 \n"
+	PPC405_ERR77(0,%3)
+	STCXL "	%1,0,%3 \n"
+	"bne-	1b"
 	ISYNC_ON_SMP
 	: "=&r" (old), "=&r" (t)
 	: "r" (mask), "r" (p)
@@ -143,18 +157,20 @@ static __inline__ int test_and_clear_bit(unsigned long nr, volatile unsigned lon
 	return (old & mask) != 0;
 }
 
-static __inline__ int test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ int test_and_change_bit(unsigned long nr,
+					  volatile unsigned long *addr)
 {
 	unsigned long old, t;
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	__asm__ __volatile__(
 	EIEIO_ON_SMP
-"1:	ldarx	%0,0,%3		# test_and_change_bit\n\
-	xor	%1,%0,%2\n\
-	stdcx.	%1,0,%3\n\
-	bne-	1b"
+"1:"	LARXL "	%0,0,%3		# test_and_change_bit\n"
+	"xor	%1,%0,%2 \n"
+	PPC405_ERR77(0,%3)
+	STCXL "	%1,0,%3 \n"
+	"bne-	1b"
 	ISYNC_ON_SMP
 	: "=&r" (old), "=&r" (t)
 	: "r" (mask), "r" (p)
@@ -168,66 +184,76 @@ static __inline__ void set_bits(unsigned long mask, unsigned long *addr)
         unsigned long old;
 
 	__asm__ __volatile__(
-"1:	ldarx	%0,0,%3		# set_bit\n\
-	or	%0,%0,%2\n\
-	stdcx.	%0,0,%3\n\
-	bne-	1b"
+"1:"	LARXL "	%0,0,%3         # set_bit\n"
+	"or	%0,%0,%2\n"
+	STCXL "	%0,0,%3\n"
+	"bne-	1b"
 	: "=&r" (old), "=m" (*addr)
 	: "r" (mask), "r" (addr), "m" (*addr)
 	: "cc");
 }
 
-/*
- * non-atomic versions
- */
-static __inline__ void __set_bit(unsigned long nr, volatile unsigned long *addr)
+/* Non-atomic versions */
+static __inline__ int test_bit(unsigned long nr,
+			       __const__ volatile unsigned long *addr)
 {
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	return 1UL & (addr[BITOP_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
+}
+
+static __inline__ void __set_bit(unsigned long nr,
+				 volatile unsigned long *addr)
+{
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	*p  |= mask;
 }
 
-static __inline__ void __clear_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ void __clear_bit(unsigned long nr,
+				   volatile unsigned long *addr)
 {
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	*p &= ~mask;
 }
 
-static __inline__ void __change_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ void __change_bit(unsigned long nr,
+				    volatile unsigned long *addr)
 {
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 
 	*p ^= mask;
 }
 
-static __inline__ int __test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ int __test_and_set_bit(unsigned long nr,
+					 volatile unsigned long *addr)
 {
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 	unsigned long old = *p;
 
 	*p = old | mask;
 	return (old & mask) != 0;
 }
 
-static __inline__ int __test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ int __test_and_clear_bit(unsigned long nr,
+					   volatile unsigned long *addr)
 {
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 	unsigned long old = *p;
 
 	*p = old & ~mask;
 	return (old & mask) != 0;
 }
 
-static __inline__ int __test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
+static __inline__ int __test_and_change_bit(unsigned long nr,
+					    volatile unsigned long *addr)
 {
-	unsigned long mask = 1UL << (nr & 0x3f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 6);
+	unsigned long mask = BITOP_MASK(nr);
+	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
 	unsigned long old = *p;
 
 	*p = old ^ mask;
@@ -235,27 +261,27 @@ static __inline__ int __test_and_change_bit(unsigned long nr, volatile unsigned
 }
 
 /*
- * Return the zero-based bit position (from RIGHT TO LEFT, 63 -> 0) of the
- * most significant (left-most) 1-bit in a double word.
+ * Return the zero-based bit position (LE, not IBM bit numbering) of
+ * the most significant 1-bit in a double word.
  */
 static __inline__ int __ilog2(unsigned long x)
 {
 	int lz;
 
-	asm ("cntlzd %0,%1" : "=r" (lz) : "r" (x));
-	return 63 - lz;
+	asm (CNTLZL " %0,%1" : "=r" (lz) : "r" (x));
+	return BITS_PER_LONG - 1 - lz;
 }
 
 /*
- * Determines the bit position of the least significant (rightmost) 0 bit
- * in the specified double word. The returned bit position will be zero-based,
- * starting from the right side (63 - 0).
+ * Determines the bit position of the least significant 0 bit in the
+ * specified double word. The returned bit position will be
+ * zero-based, starting from the right side (63/31 - 0).
  */
 static __inline__ unsigned long ffz(unsigned long x)
 {
 	/* no zero exists anywhere in the 8 byte area. */
 	if ((x = ~x) == 0)
-		return 64;
+		return BITS_PER_LONG;
 
 	/*
 	 * Calculate the bit position of the least signficant '1' bit in x
@@ -286,7 +312,13 @@ static __inline__ int ffs(int x)
  * fls: find last (most-significant) bit set.
  * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
  */
-#define fls(x) generic_fls(x)
+static __inline__ int fls(unsigned int x)
+{
+	int lz;
+
+	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
+	return 32 - lz;
+}
 
 /*
  * hweightN: returns the hamming weight (i.e. the number
@@ -297,41 +329,50 @@ static __inline__ int ffs(int x)
 #define hweight16(x) generic_hweight16(x)
 #define hweight8(x) generic_hweight8(x)
 
-extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size, unsigned long offset);
-#define find_first_zero_bit(addr, size) \
-	find_next_zero_bit((addr), (size), 0)
-
-extern unsigned long find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset);
-#define find_first_bit(addr, size) \
-	find_next_bit((addr), (size), 0)
+#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
+unsigned long find_next_zero_bit(const unsigned long *addr,
+				 unsigned long size, unsigned long offset);
+/**
+ * find_first_bit - find the first set bit in a memory region
+ * @addr: The address to start the search at
+ * @size: The maximum size to search
+ *
+ * Returns the bit-number of the first set bit, not the number of the byte
+ * containing a bit.
+ */
+#define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
+unsigned long find_next_bit(const unsigned long *addr,
+			    unsigned long size, unsigned long offset);
 
-extern unsigned long find_next_zero_le_bit(const unsigned long *addr, unsigned long size, unsigned long offset);
-#define find_first_zero_le_bit(addr, size) \
-	find_next_zero_le_bit((addr), (size), 0)
+/* Little-endian versions */
 
-static __inline__ int test_le_bit(unsigned long nr, __const__ unsigned long * addr)
+static __inline__ int test_le_bit(unsigned long nr,
+				  __const__ unsigned long *addr)
 {
-	__const__ unsigned char	*ADDR = (__const__ unsigned char *) addr;
-	return (ADDR[nr >> 3] >> (nr & 7)) & 1;
+	__const__ unsigned char	*tmp = (__const__ unsigned char *) addr;
+	return (tmp[nr >> 3] >> (nr & 7)) & 1;
 }
 
-#define test_and_clear_le_bit(nr, addr) \
-	test_and_clear_bit((nr) ^ 0x38, (addr))
-#define test_and_set_le_bit(nr, addr) \
-	test_and_set_bit((nr) ^ 0x38, (addr))
-
-/*
- * non-atomic versions
- */
-
 #define __set_le_bit(nr, addr) \
-	__set_bit((nr) ^ 0x38, (addr))
+	__set_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
 #define __clear_le_bit(nr, addr) \
-	__clear_bit((nr) ^ 0x38, (addr))
-#define __test_and_clear_le_bit(nr, addr) \
-	__test_and_clear_bit((nr) ^ 0x38, (addr))
+	__clear_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
+
+#define test_and_set_le_bit(nr, addr) \
+	test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
+#define test_and_clear_le_bit(nr, addr) \
+	test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
+
 #define __test_and_set_le_bit(nr, addr) \
-	__test_and_set_bit((nr) ^ 0x38, (addr))
+	__test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
+#define __test_and_clear_le_bit(nr, addr) \
+	__test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, (addr))
+
+#define find_first_zero_le_bit(addr, size) find_next_zero_le_bit((addr), (size), 0)
+unsigned long find_next_zero_le_bit(const unsigned long *addr,
+				    unsigned long size, unsigned long offset);
+
+/* Bitmap functions for the ext2 filesystem */
 
 #define ext2_set_bit(nr,addr) \
 	__test_and_set_le_bit((nr), (unsigned long*)addr)
@@ -343,18 +384,54 @@ static __inline__ int test_le_bit(unsigned long nr, __const__ unsigned long * ad
 #define ext2_clear_bit_atomic(lock, nr, addr) \
 	test_and_clear_le_bit((nr), (unsigned long*)addr)
 
-
 #define ext2_test_bit(nr, addr)      test_le_bit((nr),(unsigned long*)addr)
+
 #define ext2_find_first_zero_bit(addr, size) \
 	find_first_zero_le_bit((unsigned long*)addr, size)
 #define ext2_find_next_zero_bit(addr, size, off) \
 	find_next_zero_le_bit((unsigned long*)addr, size, off)
 
-#define minix_test_and_set_bit(nr,addr)		test_and_set_bit(nr,addr)
-#define minix_set_bit(nr,addr)			set_bit(nr,addr)
-#define minix_test_and_clear_bit(nr,addr)	test_and_clear_bit(nr,addr)
-#define minix_test_bit(nr,addr)			test_bit(nr,addr)
-#define minix_find_first_zero_bit(addr,size)	find_first_zero_bit(addr,size)
+/* Bitmap functions for the minix filesystem.  */
+
+#define minix_test_and_set_bit(nr,addr) \
+	__test_and_set_le_bit(nr, (unsigned long *)addr)
+#define minix_set_bit(nr,addr) \
+	__set_le_bit(nr, (unsigned long *)addr)
+#define minix_test_and_clear_bit(nr,addr) \
+	__test_and_clear_le_bit(nr, (unsigned long *)addr)
+#define minix_test_bit(nr,addr) \
+	test_le_bit(nr, (unsigned long *)addr)
+
+#define minix_find_first_zero_bit(addr,size) \
+	find_first_zero_le_bit((unsigned long *)addr, size)
+
+/*
+ * Every architecture must define this function. It's the fastest
+ * way of searching a 140-bit bitmap where the first 100 bits are
+ * unlikely to be set. It's guaranteed that at least one of the 140
+ * bits is cleared.
+ */
+static inline int sched_find_first_bit(const unsigned long *b)
+{
+#ifdef CONFIG_PPC64
+	if (unlikely(b[0]))
+		return __ffs(b[0]);
+	if (unlikely(b[1]))
+		return __ffs(b[1]) + 64;
+	return __ffs(b[2]) + 128;
+#else
+	if (unlikely(b[0]))
+		return __ffs(b[0]);
+	if (unlikely(b[1]))
+		return __ffs(b[1]) + 32;
+	if (unlikely(b[2]))
+		return __ffs(b[2]) + 64;
+	if (b[3])
+		return __ffs(b[3]) + 96;
+	return __ffs(b[4]) + 128;
+#endif
+}
 
 #endif /* __KERNEL__ */
-#endif /* _PPC64_BITOPS_H */
+
+#endif /* _ASM_POWERPC_BITOPS_H */

include/asm-ppc/bitops.h

-/*
- * bitops.h: Bit string operations on the ppc
- */
-
-#ifdef __KERNEL__
-#ifndef _PPC_BITOPS_H
-#define _PPC_BITOPS_H
-
-#include <linux/config.h>
-#include <linux/compiler.h>
-#include <asm/byteorder.h>
-#include <asm/atomic.h>
-
-/*
- * The test_and_*_bit operations are taken to imply a memory barrier
- * on SMP systems.
- */
-#ifdef CONFIG_SMP
-#define SMP_WMB		"eieio\n"
-#define SMP_MB		"\nsync"
-#else
-#define SMP_WMB
-#define SMP_MB
-#endif /* CONFIG_SMP */
-
-static __inline__ void set_bit(int nr, volatile unsigned long * addr)
-{
-	unsigned long old;
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-	
-	__asm__ __volatile__("\n\
-1:	lwarx	%0,0,%3 \n\
-	or	%0,%0,%2 \n"
-	PPC405_ERR77(0,%3)
-"	stwcx.	%0,0,%3 \n\
-	bne-	1b"
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc" );
-}
-
-/*
- * non-atomic version
- */
-static __inline__ void __set_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
-	*p |= mask;
-}
-
-/*
- * clear_bit doesn't imply a memory barrier
- */
-#define smp_mb__before_clear_bit()	smp_mb()
-#define smp_mb__after_clear_bit()	smp_mb()
-
-static __inline__ void clear_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long old;
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
-	__asm__ __volatile__("\n\
-1:	lwarx	%0,0,%3 \n\
-	andc	%0,%0,%2 \n"
-	PPC405_ERR77(0,%3)
-"	stwcx.	%0,0,%3 \n\
-	bne-	1b"
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
-}
-
-/*
- * non-atomic version
- */
-static __inline__ void __clear_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
-	*p &= ~mask;
-}
-
-static __inline__ void change_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long old;
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
-	__asm__ __volatile__("\n\
-1:	lwarx	%0,0,%3 \n\
-	xor	%0,%0,%2 \n"
-	PPC405_ERR77(0,%3)
-"	stwcx.	%0,0,%3 \n\
-	bne-	1b"
-	: "=&r" (old), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc");
-}
-
-/*
- * non-atomic version
- */
-static __inline__ void __change_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-
-	*p ^= mask;
-}
-
-/*
- * test_and_*_bit do imply a memory barrier (?)
- */
-static __inline__ int test_and_set_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned int old, t;
-	unsigned int mask = 1 << (nr & 0x1f);
-	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%4 \n\
-	or	%1,%0,%3 \n"
-	PPC405_ERR77(0,%4)
-"	stwcx.	%1,0,%4 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=&r" (t), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc", "memory");
-
-	return (old & mask) != 0;
-}
-
-/*
- * non-atomic version
- */
-static __inline__ int __test_and_set_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-	unsigned long old = *p;
-
-	*p = old | mask;
-	return (old & mask) != 0;
-}
-
-static __inline__ int test_and_clear_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned int old, t;
-	unsigned int mask = 1 << (nr & 0x1f);
-	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%4 \n\
-	andc	%1,%0,%3 \n"
-	PPC405_ERR77(0,%4)
-"	stwcx.	%1,0,%4 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=&r" (t), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc", "memory");
-
-	return (old & mask) != 0;
-}
-
-/*
- * non-atomic version
- */
-static __inline__ int __test_and_clear_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-	unsigned long old = *p;
-
-	*p = old & ~mask;
-	return (old & mask) != 0;
-}
-
-static __inline__ int test_and_change_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned int old, t;
-	unsigned int mask = 1 << (nr & 0x1f);
-	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
-
-	__asm__ __volatile__(SMP_WMB "\n\
-1:	lwarx	%0,0,%4 \n\
-	xor	%1,%0,%3 \n"
-	PPC405_ERR77(0,%4)
-"	stwcx.	%1,0,%4 \n\
-	bne	1b"
-	SMP_MB
-	: "=&r" (old), "=&r" (t), "=m" (*p)
-	: "r" (mask), "r" (p), "m" (*p)
-	: "cc", "memory");
-
-	return (old & mask) != 0;
-}
-
-/*
- * non-atomic version
- */
-static __inline__ int __test_and_change_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = 1 << (nr & 0x1f);
-	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
-	unsigned long old = *p;
-
-	*p = old ^ mask;
-	return (old & mask) != 0;
-}
-
-static __inline__ int test_bit(int nr, __const__ volatile unsigned long *addr)
-{
-	return ((addr[nr >> 5] >> (nr & 0x1f)) & 1) != 0;
-}
-
-/* Return the bit position of the most significant 1 bit in a word */
-static __inline__ int __ilog2(unsigned long x)
-{
-	int lz;
-
-	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
-	return 31 - lz;
-}
-
-static __inline__ int ffz(unsigned long x)
-{
-	if ((x = ~x) == 0)
-		return 32;
-	return __ilog2(x & -x);
-}
-
-static inline int __ffs(unsigned long x)
-{
-	return __ilog2(x & -x);
-}
-
-/*
- * ffs: find first bit set. This is defined the same way as
- * the libc and compiler builtin ffs routines, therefore
- * differs in spirit from the above ffz (man ffs).
- */
-static __inline__ int ffs(int x)
-{
-	return __ilog2(x & -x) + 1;
-}
-
-/*
- * fls: find last (most-significant) bit set.
- * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
- */
-static __inline__ int fls(unsigned int x)
-{
-	int lz;
-
-	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
-	return 32 - lz;
-}
-
-/*
- * hweightN: returns the hamming weight (i.e. the number
- * of bits set) of a N-bit word
- */
-
-#define hweight32(x) generic_hweight32(x)
-#define hweight16(x) generic_hweight16(x)
-#define hweight8(x) generic_hweight8(x)
-
-/*
- * Find the first bit set in a 140-bit bitmap.
- * The first 100 bits are unlikely to be set.
- */
-static inline int sched_find_first_bit(const unsigned long *b)
-{
-	if (unlikely(b[0]))
-		return __ffs(b[0]);
-	if (unlikely(b[1]))
-		return __ffs(b[1]) + 32;
-	if (unlikely(b[2]))
-		return __ffs(b[2]) + 64;
-	if (b[3])
-		return __ffs(b[3]) + 96;
-	return __ffs(b[4]) + 128;
-}
-
-/**
- * find_next_bit - find the next set bit in a memory region
- * @addr: The address to base the search on
- * @offset: The bitnumber to start searching at
- * @size: The maximum size to search
- */
-static __inline__ unsigned long find_next_bit(const unsigned long *addr,
-	unsigned long size, unsigned long offset)
-{
-	unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
-	unsigned int result = offset & ~31UL;
-	unsigned int tmp;
-
-	if (offset >= size)
-		return size;
-	size -= result;
-	offset &= 31UL;
-	if (offset) {
-		tmp = *p++;
-		tmp &= ~0UL << offset;
-		if (size < 32)
-			goto found_first;
-		if (tmp)
-			goto found_middle;
-		size -= 32;
-		result += 32;
-	}
-	while (size >= 32) {
-		if ((tmp = *p++) != 0)
-			goto found_middle;
-		result += 32;
-		size -= 32;
-	}
-	if (!size)
-		return result;
-	tmp = *p;
-
-found_first:
-	tmp &= ~0UL >> (32 - size);
-	if (tmp == 0UL)        /* Are any bits set? */
-		return result + size; /* Nope. */
-found_middle:
-	return result + __ffs(tmp);
-}
-
-/**
- * find_first_bit - find the first set bit in a memory region
- * @addr: The address to start the search at
- * @size: The maximum size to search
- *
- * Returns the bit-number of the first set bit, not the number of the byte
- * containing a bit.
- */
-#define find_first_bit(addr, size) \
-	find_next_bit((addr), (size), 0)
-
-/*
- * This implementation of find_{first,next}_zero_bit was stolen from
- * Linus' asm-alpha/bitops.h.
- */
-#define find_first_zero_bit(addr, size) \
-	find_next_zero_bit((addr), (size), 0)
-
-static __inline__ unsigned long find_next_zero_bit(const unsigned long *addr,
-	unsigned long size, unsigned long offset)
-{
-	unsigned int * p = ((unsigned int *) addr) + (offset >> 5);
-	unsigned int result = offset & ~31UL;
-	unsigned int tmp;
-
-	if (offset >= size)
-		return size;
-	size -= result;
-	offset &= 31UL;
-	if (offset) {
-		tmp = *p++;
-		tmp |= ~0UL >> (32-offset);
-		if (size < 32)
-			goto found_first;
-		if (tmp != ~0U)
-			goto found_middle;
-		size -= 32;
-		result += 32;
-	}
-	while (size >= 32) {
-		if ((tmp = *p++) != ~0U)
-			goto found_middle;
-		result += 32;
-		size -= 32;
-	}
-	if (!size)
-		return result;
-	tmp = *p;
-found_first:
-	tmp |= ~0UL << size;
-	if (tmp == ~0UL)        /* Are any bits zero? */
-		return result + size; /* Nope. */
-found_middle:
-	return result + ffz(tmp);
-}
-
-
-#define ext2_set_bit(nr, addr)	__test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
-#define ext2_set_bit_atomic(lock, nr, addr)  test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
-#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))
-#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))
-
-static __inline__ int ext2_test_bit(int nr, __const__ void * addr)
-{
-	__const__ unsigned char	*ADDR = (__const__ unsigned char *) addr;
-
-	return (ADDR[nr >> 3] >> (nr & 7)) & 1;
-}
-
-/*
- * This implementation of ext2_find_{first,next}_zero_bit was stolen from
- * Linus' asm-alpha/bitops.h and modified for a big-endian machine.
- */
-
-#define ext2_find_first_zero_bit(addr, size) \
-        ext2_find_next_zero_bit((addr), (size), 0)
-
-static __inline__ unsigned long ext2_find_next_zero_bit(const void *addr,
-	unsigned long size, unsigned long offset)
-{
-	unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
-	unsigned int result = offset & ~31UL;
-	unsigned int tmp;
-
-	if (offset >= size)
-		return size;
-	size -= result;
-	offset &= 31UL;
-	if (offset) {
-		tmp = cpu_to_le32p(p++);
-		tmp |= ~0UL >> (32-offset);
-		if (size < 32)
-			goto found_first;
-		if (tmp != ~0U)
-			goto found_middle;
-		size -= 32;
-		result += 32;
-	}
-	while (size >= 32) {
-		if ((tmp = cpu_to_le32p(p++)) != ~0U)
-			goto found_middle;
-		result += 32;
-		size -= 32;
-	}
-	if (!size)
-		return result;
-	tmp = cpu_to_le32p(p);
-found_first:
-	tmp |= ~0U << size;
-	if (tmp == ~0UL)        /* Are any bits zero? */
-		return result + size; /* Nope. */
-found_middle:
-	return result + ffz(tmp);
-}
-
-/* Bitmap functions for the minix filesystem.  */
-#define minix_test_and_set_bit(nr,addr) ext2_set_bit(nr,addr)
-#define minix_set_bit(nr,addr) ((void)ext2_set_bit(nr,addr))
-#define minix_test_and_clear_bit(nr,addr) ext2_clear_bit(nr,addr)
-#define minix_test_bit(nr,addr) ext2_test_bit(nr,addr)
-#define minix_find_first_zero_bit(addr,size) ext2_find_first_zero_bit(addr,size)
-
-#endif /* _PPC_BITOPS_H */
-#endif /* __KERNEL__ */

include/asm-ppc64/mmu_context.h

@@ -16,21 +16,6 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-/*
- * Every architecture must define this function. It's the fastest
- * way of searching a 140-bit bitmap where the first 100 bits are
- * unlikely to be set. It's guaranteed that at least one of the 140
- * bits is cleared.
- */
-static inline int sched_find_first_bit(unsigned long *b)
-{
-	if (unlikely(b[0]))
-		return __ffs(b[0]);
-	if (unlikely(b[1]))
-		return __ffs(b[1]) + 64;
-	return __ffs(b[2]) + 128;
-}
-
 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 {
 }