[PATCH] s390: core changes

From: Christian Borntrdger <cborntra@de.ibm.com>
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
From: Thomas Spatzier <tspat@de.ibm.com>

s390 core changes:
 - Add default storage key and introduce page_{set,get}_storage_key.
 - Fix access to siginfo in copy_siginfo_from_user32.
 - Regenerate default configuration.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/s390/defconfig

 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.9-rc2
-# Mon Sep 20 17:16:38 2004
+# Linux kernel version: 2.6.9-rc3
+# Fri Oct  8 19:17:35 2004
 #
 CONFIG_MMU=y
 CONFIG_RWSEM_XCHGADD_ALGORITHM=y
@@ -520,7 +520,7 @@ CONFIG_CRYPTO=y
 # CONFIG_CRYPTO_SHA1_Z990 is not set
 # CONFIG_CRYPTO_SHA256 is not set
 # CONFIG_CRYPTO_SHA512 is not set
-# CONFIG_CRYPTO_WHIRLPOOL is not set
+# CONFIG_CRYPTO_WP512 is not set
 # CONFIG_CRYPTO_DES is not set
 # CONFIG_CRYPTO_DES_Z990 is not set
 # CONFIG_CRYPTO_BLOWFISH is not set

arch/s390/kernel/compat_signal.c

@@ -118,10 +118,10 @@ int copy_siginfo_from_user32(siginfo_t *to, siginfo_t32 __user *from)
 	err |= __get_user(to->si_errno, &from->si_errno);
 	err |= __get_user(to->si_code, &from->si_code);
 
-	if (from->si_code < 0)
+	if (to->si_code < 0)
 		err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
 	else {
-		switch (from->si_code >> 16) {
+		switch (to->si_code >> 16) {
 		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
 		case __SI_MESGQ >> 16:
 			err |= __get_user(to->si_int, &from->si_int);

arch/s390/kernel/s390_ksyms.c

@@ -34,6 +34,7 @@ EXPORT_SYMBOL(__clear_user_asm);
 EXPORT_SYMBOL(__strncpy_from_user_asm);
 EXPORT_SYMBOL(__strnlen_user_asm);
 EXPORT_SYMBOL(diag10);
+EXPORT_SYMBOL(default_storage_key);
 
 /*
  * semaphore ops

arch/s390/kernel/setup.c

@@ -53,6 +53,7 @@ unsigned int console_devno = -1;
 unsigned int console_irq = -1;
 unsigned long memory_size = 0;
 unsigned long machine_flags = 0;
+unsigned int default_storage_key = 0;
 struct {
 	unsigned long addr, size, type;
 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };

include/asm-s390/page.h

@@ -162,6 +162,25 @@ typedef struct { unsigned long pgd; } pgd_t;
 #define __pgd(x)        ((pgd_t) { (x) } )
 #define __pgprot(x)     ((pgprot_t) { (x) } )
 
+/* default storage key used for all pages */
+extern unsigned int default_storage_key;
+
+static inline void
+page_set_storage_key(unsigned long addr, unsigned int skey)
+{
+	asm volatile ( "sske %0,%1" : : "d" (skey), "a" (addr) );
+}
+
+static inline unsigned int
+page_get_storage_key(unsigned long addr)
+{
+	unsigned int skey;
+
+	asm volatile ( "iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0) );
+
+	return skey;
+}
+
 #endif /* !__ASSEMBLY__ */
 
 /* to align the pointer to the (next) page boundary */

include/asm-s390/pgtable.h

@@ -597,17 +597,13 @@ ptep_establish(struct vm_area_struct *vma,
  * should therefore only be called if it is not mapped in any
  * address space.
  */
-#define page_test_and_clear_dirty(page)					  \
+#define page_test_and_clear_dirty(_page)				  \
 ({									  \
-	struct page *__page = (page);					  \
+	struct page *__page = (_page);					  \
 	unsigned long __physpage = __pa((__page-mem_map) << PAGE_SHIFT);  \
-	int __skey;							  \
-	asm volatile ("iske %0,%1" : "=d" (__skey) : "a" (__physpage));   \
-	if (__skey & _PAGE_CHANGED) {					  \
-		asm volatile ("sske %0,%1"				  \
-			      : : "d" (__skey & ~_PAGE_CHANGED),	  \
-			          "a" (__physpage));			  \
-	}								  \
+	int __skey = page_get_storage_key(__physpage);			  \
+	if (__skey & _PAGE_CHANGED)					  \
+		page_set_storage_key(__physpage, __skey & ~_PAGE_CHANGED);\
 	(__skey & _PAGE_CHANGED);					  \
 })
 
@@ -655,11 +651,10 @@ static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
 })
 
 #define SetPageUptodate(_page) \
-	do {								  \
-		struct page *__page = (_page);				  \
-		if (!test_and_set_bit(PG_uptodate, &__page->flags))	  \
-			asm volatile ("sske %0,%1" : : "d" (0),		  \
-			      "a" (__pa((__page-mem_map) << PAGE_SHIFT)));\
+	do {								      \
+		struct page *__page = (_page);				      \
+		if (!test_and_set_bit(PG_uptodate, &__page->flags))	      \
+			page_test_and_clear_dirty(_page);		      \
 	} while (0)
 
 #ifdef __s390x__