Commit-ID: 3500130b84a3cdc5b6796eba1daf178944935efe Gitweb: https://git.kernel.org/tip/3500130b84a3cdc5b6796eba1daf178944935efe Author: Andy Lutomirski <luto@xxxxxxxxxx> AuthorDate: Thu, 2 Nov 2017 00:59:11 -0700 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Thu, 2 Nov 2017 11:04:44 +0100 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@xxxxxxxxxx> Cc: Borislav Petkov <bpetkov@xxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/b49b3f95a8ff858c40c9b0f5b32be0355324327d.1509609304.git.luto@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/include/asm/processor.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 064b847..ad59cec 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). -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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