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Date: Wed, 26 Nov 2008 22:17:01 +0300 From: gorcunov@...il.com To: mingo@...e.hu, tglx@...utronix.de, hpa@...or.com Cc: linux-kernel@...r.kernel.org, heukelum@...tmail.fm, Cyrill Gorcunov <gorcunov@...il.com> Subject: [PATCH 2/5] x86: ret_from_fork - get rid of jump back From: Cyrill Gorcunov <gorcunov@...il.com> Impact: cleanup, microoptimization Use straightforward jumping if possible, cpu like it. Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com> --- arch/x86/kernel/entry_64.S | 10 ++++------ 1 files changed, 4 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 098ba0b..7b52b0f 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -379,7 +379,10 @@ ENTRY(ret_from_fork) GET_THREAD_INFO(%rcx) testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%rcx) CFI_REMEMBER_STATE - jnz rff_trace + jz rff_action + movq %rsp,%rdi + call syscall_trace_leave + GET_THREAD_INFO(%rcx) rff_action: RESTORE_REST testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread? @@ -389,11 +392,6 @@ rff_action: RESTORE_TOP_OF_STACK %rdi, -ARGOFFSET jmp ret_from_sys_call CFI_RESTORE_STATE -rff_trace: - movq %rsp,%rdi - call syscall_trace_leave - GET_THREAD_INFO(%rcx) - jmp rff_action CFI_ENDPROC END(ret_from_fork) -- 1.6.0.4.603.gbc9c0 -- 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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