On Sun, 31 Dec 2006 11:45:09 -0800 Daniel Walker wrote:
> On Sun, 2006-12-31 at 23:04 +0800, Fengguang Wu wrote:
> > Hi,
> >
> > The following messages keeps popping up when CONFIG_PROFILE_LIKELY=y:
> >
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> > init[1]: segfault at ffffffff8118c110 rip ffffffff8118c110 rsp 00007fff9a9d14d8 error 15
> >
>
>
> Does this seem like an appropriate solution? This just reconstitutes
> Ingo's patch by removing the unlikely calls that got added recently.
How does this fix the problem? (if it does)
What is the real cause of the problem?
> Maybe a comment into vsyscall.c that says to stay away from all macro's
> and possible debug code that could be added might be helpful ?
Why?
> Signed-Off-By: Daniel Walker <[email protected]>
>
> ---
> arch/x86_64/kernel/vsyscall.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> Index: linux-2.6.19/arch/x86_64/kernel/vsyscall.c
> ===================================================================
> --- linux-2.6.19.orig/arch/x86_64/kernel/vsyscall.c
> +++ linux-2.6.19/arch/x86_64/kernel/vsyscall.c
> @@ -111,7 +111,7 @@ static __always_inline void do_vgettimeo
> seq = read_seqbegin(&__vsyscall_gtod_data.lock);
>
> vread = __vsyscall_gtod_data.clock.vread;
> - if (unlikely(!__vsyscall_gtod_data.sysctl_enabled || !vread)) {
> + if (!__vsyscall_gtod_data.sysctl_enabled || !vread) {
> gettimeofday(tv,0);
> return;
> }
> @@ -151,7 +151,7 @@ int __vsyscall(0) vgettimeofday(struct t
> * unlikely */
> time_t __vsyscall(1) vtime(time_t *t)
> {
> - if (unlikely(!__vsyscall_gtod_data.sysctl_enabled))
> + if (!__vsyscall_gtod_data.sysctl_enabled)
> return time_syscall(t);
> else if (t)
> *t = __vsyscall_gtod_data.wall_time_tv.tv_sec;
---
~Randy
-
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