Messages in this thread Patch in this message |  | | Date | Thu, 9 Apr 2015 02:02:52 -0700 | From | tip-bot for Denys Vlasenko <> | Subject | [tip:x86/asm] x86/asm/entry/64: Optimize [v]fork/clone stubs |
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Commit-ID: 772951c4e4b06cdffeff499259dba07b544f3166 Gitweb: http://git.kernel.org/tip/772951c4e4b06cdffeff499259dba07b544f3166 Author: Denys Vlasenko <dvlasenk@redhat.com> AuthorDate: Tue, 7 Apr 2015 22:43:40 +0200 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Thu, 9 Apr 2015 10:31:25 +0200
x86/asm/entry/64: Optimize [v]fork/clone stubs
Replace "call func; ret" with "jmp func".
Run-tested.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.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: Thomas Gleixner <tglx@linutronix.de> Cc: Will Drewry <wad@chromium.org> Link: http://lkml.kernel.org/r/1428439424-7258-4-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/kernel/entry_64.S | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 5380b3a..ce85256 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -484,8 +484,7 @@ ENTRY(stub_\func) CFI_STARTPROC DEFAULT_FRAME 0, 8 /* offset 8: return address */ SAVE_EXTRA_REGS 8 - call sys_\func - ret + jmp sys_\func CFI_ENDPROC END(stub_\func) .endm
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