Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

u64_stats: Introduce IRQs disabled helpers

Browse source 
Introduce light versions of u64_stats helpers for context where
either preempt or IRQs are disabled. This way we can make this library
usable by scheduler irqtime accounting which currenty implement its
ad-hoc version.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1474849761-12678-4-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2016-09-26 02:29:19 +02:00 committed by Ingo Molnar
parent 2810f611f9
commit 68107df5f2
1 changed files with 25 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

47
include/linux/u64_stats_sync.h
View file

@ -103,29 +103,40 @@ static inline void u64_stats_update_end_raw(struct u64_stats_sync *syncp)
#endif
}
static inline unsigned int u64_stats_fetch_begin(const struct u64_stats_sync *syncp)
static inline unsigned int __u64_stats_fetch_begin(const struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
return read_seqcount_begin(&syncp->seq);
#else
#if BITS_PER_LONG==32
return 0;
#endif
}
static inline unsigned int u64_stats_fetch_begin(const struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG==32 && !defined(CONFIG_SMP)
preempt_disable();
#endif
return 0;
return __u64_stats_fetch_begin(syncp);
}
static inline bool __u64_stats_fetch_retry(const struct u64_stats_sync *syncp,
unsigned int start)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
return read_seqcount_retry(&syncp->seq, start);
#else
return false;
#endif
}
static inline bool u64_stats_fetch_retry(const struct u64_stats_sync *syncp,
unsigned int start)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
return read_seqcount_retry(&syncp->seq, start);
#else
#if BITS_PER_LONG==32
#if BITS_PER_LONG==32 && !defined(CONFIG_SMP)
preempt_enable();
#endif
return false;
#endif
return __u64_stats_fetch_retry(syncp, start);
}
/*
@ -136,27 +147,19 @@ static inline bool u64_stats_fetch_retry(const struct u64_stats_sync *syncp,
*/
static inline unsigned int u64_stats_fetch_begin_irq(const struct u64_stats_sync *syncp)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
return read_seqcount_begin(&syncp->seq);
#else
#if BITS_PER_LONG==32
#if BITS_PER_LONG==32 && !defined(CONFIG_SMP)
local_irq_disable();
#endif
return 0;
#endif
return __u64_stats_fetch_begin(syncp);
}
static inline bool u64_stats_fetch_retry_irq(const struct u64_stats_sync *syncp,
unsigned int start)
unsigned int start)
{
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
return read_seqcount_retry(&syncp->seq, start);
#else
#if BITS_PER_LONG==32
#if BITS_PER_LONG==32 && !defined(CONFIG_SMP)
local_irq_enable();
#endif
return false;
#endif
return __u64_stats_fetch_retry(syncp, start);
}
#endif /* _LINUX_U64_STATS_SYNC_H */