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Date: Fri, 8 Aug 2014 19:44:39 +0200 From: Denys Vlasenko <dvlasenk@...hat.com> To: linux-kernel@...r.kernel.org Cc: Denys Vlasenko <dvlasenk@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Oleg Nesterov <oleg@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...capital.net>, Frederic Weisbecker <fweisbec@...il.com>, X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>, Will Drewry <wad@...omium.org>, Kees Cook <keescook@...omium.org> Subject: [PATCH 16/17] x86: entry_64.S: trivial optimization for ENOSYS This code uses a slightly shorter insn. Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com> CC: Linus Torvalds <torvalds@...ux-foundation.org> CC: Oleg Nesterov <oleg@...hat.com> CC: "H. Peter Anvin" <hpa@...or.com> CC: Andy Lutomirski <luto@...capital.net> CC: Frederic Weisbecker <fweisbec@...il.com> CC: X86 ML <x86@...nel.org> CC: Alexei Starovoitov <ast@...mgrid.com> CC: Will Drewry <wad@...omium.org> CC: Kees Cook <keescook@...omium.org> CC: linux-kernel@...r.kernel.org --- arch/x86/kernel/entry_64.S | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 7bc8c24..5d639a6 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -272,6 +272,7 @@ system_call_fastpath: ja badsys movq %r10,%rcx call *sys_call_table(,%rax,8) # XXX: rip relative +from_badsys: movq %rax,RAX(%rsp) /* * Syscall return path ending with SYSRET (fast path) @@ -334,8 +335,8 @@ sysret_signal: jmp int_check_syscall_exit_work badsys: - movq $-ENOSYS,RAX(%rsp) - jmp ret_from_sys_call + movq $-ENOSYS,%rax + jmp from_badsys #ifdef CONFIG_AUDITSYSCALL /* -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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