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x86: rename stack_pointer to kernel_trap_sp

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Choose a less generic name for such a special case.  Add
a comment explaining the odd use in X86_32.

Change the one user of stack_pointer.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Harvey Harrison 2008-01-30 13:33:16 +01:00 committed by Ingo Molnar
parent dbe3533b7f
commit f6e8e28410
2 changed files with 8 additions and 2 deletions
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2
arch/x86/oprofile/backtrace.c
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@ -77,7 +77,7 @@ void
x86_backtrace(struct pt_regs * const regs, unsigned int depth)
{
struct frame_head *head = (struct frame_head *)frame_pointer(regs);
unsigned long stack = stack_pointer(regs);
unsigned long stack = kernel_trap_sp(regs);
if (!user_mode_vm(regs)) {
if (depth)

8
include/asm-x86/ptrace.h
View file

@ -182,7 +182,13 @@ static inline int v8086_mode(struct pt_regs *regs)
#endif
}
static inline unsigned long stack_pointer(struct pt_regs *regs)
/*
* X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
* when it traps. So regs will be the current sp.
*
* This is valid only for kernel mode traps.
*/
static inline unsigned long kernel_trap_sp(struct pt_regs *regs)
{
#ifdef CONFIG_X86_32
return (unsigned long)regs;