Further PPC updates - fix thread_saved_pc, make sure init_thread_union

is properly 8kB-aligned.

arch/ppc/kernel/head.S

@@ -1727,10 +1727,6 @@ m8260_gorom:
 	.data
 	.globl	sdata
 sdata:
-	.globl	init_thread_union
-init_thread_union:
-	.space	8192
-
 	.globl	empty_zero_page
 empty_zero_page:
 	.space	4096

arch/ppc/kernel/head_4xx.S

@@ -1082,8 +1082,6 @@ _GLOBAL(set_context)
  */
 	.data
 _GLOBAL(sdata)
-_GLOBAL(init_thread_union)
-	.space	8192
 _GLOBAL(empty_zero_page)
 	.space	4096
 _GLOBAL(swapper_pg_dir)

arch/ppc/kernel/head_8xx.S

@@ -971,10 +971,6 @@ set_dec_cpu6:
 	.data
 	.globl	sdata
 sdata:
-	.globl	init_thread_union
-init_thread_union:
-	.space	8192
-
 	.globl	empty_zero_page
 empty_zero_page:
 	.space	4096

arch/ppc/kernel/iSeries_head.S

@@ -1496,11 +1496,6 @@ _GLOBAL(abort)
 	.data
 	.globl	sdata
 sdata:
-
-	.globl	init_thread_union
-init_thread_union:
-	.space	8192
-
 	.globl	empty_zero_page
 empty_zero_page:
 	.space	4096

arch/ppc/kernel/process.c

@@ -59,6 +59,12 @@ static struct files_struct init_files = INIT_FILES;
 static struct signal_struct init_signals = INIT_SIGNALS;
 struct mm_struct init_mm = INIT_MM(init_mm);
 
+/* this is 8kB-aligned so we can get to the thread_info struct
+   at the base of it from the stack pointer with 1 integer instruction. */
+union thread_union init_thread_union
+	__attribute__((__section__(".data.init_task"))) =
+{ INIT_THREAD_INFO(init_task) };
+
 /* initial task structure */
 struct task_struct init_task = INIT_TASK(init_task);
 

arch/ppc/kernel/setup.c

@@ -35,7 +35,6 @@
 #include <asm/uaccess.h>
 #include <asm/system.h>
 #include <asm/pmac_feature.h>
-#include <asm/thread_info.h>
 
 #if defined CONFIG_KGDB
 #include <asm/kgdb.h>
@@ -542,9 +541,6 @@ int __init ppc_init(void)
 
 arch_initcall(ppc_init);
 
-/* Initial thread_info struct, copied into init_task_union */
-struct thread_info init_thread_values __initdata = INIT_THREAD_INFO(init_task);
-
 /* Warning, IO base is not yet inited */
 void __init setup_arch(char **cmdline_p)
 {
@@ -553,9 +549,6 @@ void __init setup_arch(char **cmdline_p)
 	extern char *klimit;
 	extern void do_init_bootmem(void);
 
-	/* initialize the thread_info for the init task */
-	init_thread_info = init_thread_values;
-
 	/* so udelay does something sensible, assume <= 1000 bogomips */
 	loops_per_jiffy = 500000000 / HZ;
 

arch/ppc/vmlinux.lds

@@ -49,8 +49,9 @@ SECTIONS
   .fini      : { *(.fini)    } =0
   .ctors     : { *(.ctors)   }
   .dtors     : { *(.dtors)   }
+
   /* Read-write section, merged into data segment: */
-  . = (. + 0x0FFF) & 0xFFFFF000;
+  . = ALIGN(4096);
   .data    :
   {
     *(.data)
@@ -80,6 +81,9 @@ SECTIONS
   . = ALIGN(32);
   .data.cacheline_aligned : { *(.data.cacheline_aligned) }
 
+  . = ALIGN(8192);
+  .data.init_task : { *(.data.init_task) }
+
   . = ALIGN(4096);
   __init_begin = .;
   .text.init : { *(.text.init) }

include/asm-ppc/processor.h

@@ -714,10 +714,8 @@ struct thread_struct {
 /*
  * Return saved PC of a blocked thread. For now, this is the "user" PC
  */
-static inline unsigned long thread_saved_pc(struct thread_struct *t)
-{
-	return (t->regs) ? t->regs->nip : 0;
-}
+#define thread_saved_pc(tsk)	\
+	((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 
 #define copy_segments(tsk, mm)		do { } while (0)
 #define release_segments(mm)		do { } while (0)