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| author | Andy Lutomirski <luto@kernel.org> | 2017-11-02 00:59:11 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-11-02 11:04:44 +0100 |
| commit | 3500130b84a3cdc5b6796eba1daf178944935efe (patch) | |
| tree | fb207c28ace59732ef5e4b16807b5db3d83c69bb /arch/x86/include | |
| parent | da51da189a24bb9b7e2d5a123be096e51a4695a5 (diff) | |
| download | lwn-3500130b84a3cdc5b6796eba1daf178944935efe.tar.gz lwn-3500130b84a3cdc5b6796eba1daf178944935efe.zip | |
x86/entry: Add task_top_of_stack() to find the top of a task's stack
This will let us get rid of a few places that hardcode accesses to
thread.sp0.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/b49b3f95a8ff858c40c9b0f5b32be0355324327d.1509609304.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 064b84722166..ad59cec14239 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -795,6 +795,8 @@ static inline void spin_lock_prefetch(const void *x) #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \ TOP_OF_KERNEL_STACK_PADDING) +#define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1)) + #ifdef CONFIG_X86_32 /* * User space process size: 3GB (default). |