linux-kernel - Re: 2.6.23-rc3-mm1 - vdso and gettimeofday issues with glibc

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Date:	Thu, 30 Aug 2007 12:30:57 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Valdis.Kletnieks@...edu, jakub@...hat.com,
	Ulrich Drepper <drepper@...hat.com>,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>
Subject: Re: 2.6.23-rc3-mm1 - vdso and gettimeofday issues with glibc

On 08/29/2007 07:15 PM, Andrew Morton wrote:
> 
> So it's an interaction between the x86_64 vdso patches in Andi's tree and 
> newer glibc, and we don't know which one is getting it wrong yet?
> 

Just found this duplicated code in 2.6.23-rc4, maybe it was supposed
to be something else? The second one was added in the x86_64 vdso patch.

arch/x86_64/kernel/vsyscall.c:

void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
{
        unsigned long flags;

        write_seqlock_irqsave(&vsyscall_gtod_data.lock, flags);
        /* copy vsyscall data */
        vsyscall_gtod_data.clock.vread = clock->vread;
        vsyscall_gtod_data.clock.cycle_last = clock->cycle_last;
        vsyscall_gtod_data.clock.mask = clock->mask;
        vsyscall_gtod_data.clock.mult = clock->mult;
        vsyscall_gtod_data.clock.shift = clock->shift;
        vsyscall_gtod_data.wall_time_sec = wall_time->tv_sec;
        vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;  <===
        vsyscall_gtod_data.sys_tz = sys_tz;
        vsyscall_gtod_data.wall_time_nsec = wall_time->tv_nsec;  <===
        vsyscall_gtod_data.wall_to_monotonic = wall_to_monotonic;
        write_sequnlock_irqrestore(&vsyscall_gtod_data.lock, flags);
}
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