Messages in this thread Patch in this message | | | Date | Thu, 2 Nov 2017 03:54:21 -0700 | From | tip-bot for Andy Lutomirski <> | Subject | [tip:x86/asm] x86/entry: Add task_top_of_stack() to find the top of a task's stack |
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Commit-ID: 3500130b84a3cdc5b6796eba1daf178944935efe Gitweb: https://git.kernel.org/tip/3500130b84a3cdc5b6796eba1daf178944935efe Author: Andy Lutomirski <luto@kernel.org> AuthorDate: Thu, 2 Nov 2017 00:59:11 -0700 Committer: Ingo Molnar <mingo@kernel.org> 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@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> --- 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).
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