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| author | Eric Dumazet <dada1@cosmosbay.com> | 2007-02-13 13:26:21 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-02-13 13:26:21 +0100 |
| commit | 5809f9d442e9dbb23859e2c37d8c47043f6b5cc9 (patch) | |
| tree | 24c634f6de962734a1a6a8b94504d9555a35fcea | |
| parent | 26054ed02bb20f5b2e02d92cb6f0be0e2b0196d5 (diff) | |
| download | linux-5809f9d442e9dbb23859e2c37d8c47043f6b5cc9.tar.gz linux-5809f9d442e9dbb23859e2c37d8c47043f6b5cc9.tar.bz2 linux-5809f9d442e9dbb23859e2c37d8c47043f6b5cc9.zip | |
[PATCH] x86-64: get rid of ARCH_HAVE_XTIME_LOCK
ARCH_HAVE_XTIME_LOCK is used by x86_64 arch . This arch needs to place a
read only copy of xtime_lock into vsyscall page. This read only copy is
named __xtime_lock, and xtime_lock is defined in
arch/x86_64/kernel/vmlinux.lds.S as an alias. So the declaration of
xtime_lock in kernel/timer.c was guarded by ARCH_HAVE_XTIME_LOCK define,
defined to true on x86_64.
We can get same result with _attribute__((weak)) in the declaration. linker
should do the job.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
| -rw-r--r-- | include/asm-x86_64/vsyscall.h | 5 | ||||
| -rw-r--r-- | include/linux/time.h | 2 | ||||
| -rw-r--r-- | kernel/timer.c | 4 |
3 files changed, 2 insertions, 9 deletions
diff --git a/include/asm-x86_64/vsyscall.h b/include/asm-x86_64/vsyscall.h index 05cb8dd200de..0c7847165eae 100644 --- a/include/asm-x86_64/vsyscall.h +++ b/include/asm-x86_64/vsyscall.h @@ -56,11 +56,6 @@ extern struct vxtime_data vxtime; extern int vgetcpu_mode; extern struct timezone sys_tz; extern int sysctl_vsyscall; -extern seqlock_t xtime_lock; - -extern int sysctl_vsyscall; - -#define ARCH_HAVE_XTIME_LOCK 1 #endif /* __KERNEL__ */ diff --git a/include/linux/time.h b/include/linux/time.h index 55cee172d723..eceb1a59b078 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -90,7 +90,7 @@ static inline struct timespec timespec_sub(struct timespec lhs, extern struct timespec xtime; extern struct timespec wall_to_monotonic; -extern seqlock_t xtime_lock; +extern seqlock_t xtime_lock __attribute__((weak)); void timekeeping_init(void); diff --git a/kernel/timer.c b/kernel/timer.c index 8533c3796082..4902181e10e6 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -1162,11 +1162,9 @@ static inline void calc_load(unsigned long ticks) * This read-write spinlock protects us from races in SMP while * playing with xtime and avenrun. */ -#ifndef ARCH_HAVE_XTIME_LOCK -__cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock); +__attribute__((weak)) __cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock); EXPORT_SYMBOL(xtime_lock); -#endif /* * This function runs timers and the timer-tq in bottom half context. |