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seqlock: remove optional mutex 

This option is unused; besides, it bloats the struct when not needed.
Let's just let writers define their own locks elsewhere.

Reviewed-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1465412133-3029-3-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Emilio G. Cota 2016-06-08 14:55:20 -04:00 committed by Richard Henderson
parent 911a4d2215
commit ccdb3c1fc8
2 changed files with 2 additions and 10 deletions
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2
cpus.c
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@ -621,7 +621,7 @@ int cpu_throttle_get_percentage(void)
void cpu_ticks_init(void)
{
seqlock_init(&timers_state.vm_clock_seqlock, NULL);
seqlock_init(&timers_state.vm_clock_seqlock);
vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
cpu_throttle_timer_tick, NULL);

10
include/qemu/seqlock.h
View File

@ -19,22 +19,17 @@
typedef struct QemuSeqLock QemuSeqLock;
struct QemuSeqLock {
QemuMutex *mutex;
unsigned sequence;
};
static inline void seqlock_init(QemuSeqLock *sl, QemuMutex *mutex)
static inline void seqlock_init(QemuSeqLock *sl)
{
sl->mutex = mutex;
sl->sequence = 0;
}
/* Lock out other writers and update the count. */
static inline void seqlock_write_lock(QemuSeqLock *sl)
{
if (sl->mutex) {
qemu_mutex_lock(sl->mutex);
}
++sl->sequence;
/* Write sequence before updating other fields. */
@ -47,9 +42,6 @@ static inline void seqlock_write_unlock(QemuSeqLock *sl)
smp_wmb();
++sl->sequence;
if (sl->mutex) {
qemu_mutex_unlock(sl->mutex);
}
}
static inline unsigned seqlock_read_begin(QemuSeqLock *sl)