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    SubjectRe: [PATCH 2/5] x86: ret_from_fork - get rid of jump back
    [Andi Kleen - Wed, Nov 26, 2008 at 09:04:33PM +0100]
    | gorcunov@gmail.com writes:
    | > --- 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)
    |
    | The uncommon path is supposed to be out of line. I don't think
    | the CPU will like that.
    |
    | -Andi
    |
    | > rff_action:
    |
    | --
    | ak@linux.intel.com
    |

    Aha! Thanks Andi for review.

    - Cyrill -


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