Commit-ID: 3500130b84a3cdc5b6796eba1daf178944935efe Gitweb: https://git.kernel.org/tip/3500130b84a3cdc5b6796eba1daf178944935efe Author: Andy Lutomirski <[email protected]> AuthorDate: Thu, 2 Nov 2017 00:59:11 -0700 Committer: Ingo Molnar <[email protected]> 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 <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/b49b3f95a8ff858c40c9b0f5b32be0355324327d.1509609304.git.l...@kernel.org Signed-off-by: Ingo Molnar <[email protected]> --- 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).
