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| author | Ingo Molnar <mingo@kernel.org> | 2015-03-17 16:42:59 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-17 18:01:41 +0300 |
| commit | 9854dd74c3f6af8d9d527de86c6074b7ed0495f1 (patch) | |
| tree | 9e37ff521247975e3e37359ff54c050811ed98a4 /arch/x86/include/asm/processor.h | |
| parent | 33db1fd48ac3d90385b412b41a8a6525096ac6d5 (diff) | |
| download | linux-9854dd74c3f6af8d9d527de86c6074b7ed0495f1.tar.xz | |
x86/asm/entry/64: Simplify 'old_rsp' usage
Remove all manipulations of PER_CPU(old_rsp) in C code:
- it is not used on SYSRET return anymore, and system entries
are atomic, so updating it from the fork and context switch
paths is pointless.
- Tweak a few related comments as well: we no longer have a
"partial stack frame" on entry, ever.
Based on (split out of) patch from Denys Vlasenko.
Originally-from: Denys Vlasenko <dvlasenk@redhat.com>
Tested-by: Borislav Petkov <bp@alien8.de>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1426599779-8010-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/processor.h')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 5abd9a535a24..3ac5092ec113 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -905,11 +905,6 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk); #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1) extern unsigned long KSTK_ESP(struct task_struct *task); -/* - * User space RSP while inside the SYSCALL fast path - */ -DECLARE_PER_CPU(unsigned long, old_rsp); - #endif /* CONFIG_X86_64 */ extern void start_thread(struct pt_regs *regs, unsigned long new_ip, |