[PATCH] x86-64: fix vtime() vsyscall

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There is a tiny probability that the return value from vtime(time_t *t) is
Signed-off-by: Andi Kleen <ak@suse.de>

different than the value stored in *t

Using a temporary variable solves the problem and gives a faster code.

   17:   48 85 ff                test   %rdi,%rdi
   1a:   48 8b 05 00 00 00 00    mov    0(%rip),%rax        #
__vsyscall_gtod_data.wall_time_tv.tv_sec
   21:   74 03                   je     26
   23:   48 89 07                mov    %rax,(%rdi)
   26:   c9                      leaveq
   27:   c3                      retq

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>

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This commit is contained in:

Eric Dumazet 2007-05-02 19:27:11 +02:00 • committed by Andi Kleen

parent bd8559c38e

commit 272a3713bb

1 changed files with 5 additions and 3 deletions

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arch/x86_64/kernel/vsyscall.c

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