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[Qemu-devel] [PATCH v2 03/13] seqlock: remove optional mutex
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [PATCH v2 03/13] seqlock: remove optional mutex |
Date: |
Thu, 7 Apr 2016 13:32:28 -0400 |
This option is unused; besides, it bloats the struct when not needed.
Let's just let writers define their own locks elsewhere.
Reviewed-by: Alex Bennée <address@hidden>
Signed-off-by: Emilio G. Cota <address@hidden>
---
cpus.c | 2 +-
include/qemu/seqlock.h | 10 +---------
2 files changed, 2 insertions(+), 10 deletions(-)
diff --git a/cpus.c b/cpus.c
index 8ae4777..7f550b9 100644
--- a/cpus.c
+++ b/cpus.c
@@ -611,7 +611,7 @@ 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);
diff --git a/include/qemu/seqlock.h b/include/qemu/seqlock.h
index 70b01fd..e673482 100644
--- a/include/qemu/seqlock.h
+++ b/include/qemu/seqlock.h
@@ -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)
--
2.5.0
- Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, (continued)
- [Qemu-devel] [PATCH v2 10/13] tb hash: hash phys_pc, pc, and flags with xxhash, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 02/13] compiler.h: add QEMU_ALIGNED() to enforce struct alignment, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 08/13] qemu-thread: optimize spin_lock for uncontended locks, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 07/13] qemu-thread: call cpu_relax() while spinning, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 03/13] seqlock: remove optional mutex,
Emilio G. Cota <=
- Re: [Qemu-devel] [PATCH v2 00/10] tb hash improvements, Alex Bennée, 2016/04/08
- Message not available