[PATCH RT 04/25][RFC 3.0.23-rt39-rc1] revert-seqlock-remove-unused-functions
From: Steven Rostedt <rostedt@goodmis.org>
Date: 2012-03-06 16:23:56
Also in:
lkml
Subsystem:
locking primitives, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Will Deacon, Boqun Feng, Linus Torvalds
From: Steven Rostedt <rostedt@goodmis.org>
revert: seqlock-remove-unused-functions.patch
Revert:
Author: Thomas Gleixner [off-list ref]
Date: Sat Jul 16 18:38:22 2011 +0200
seqlock-remove-unused-functions.patch
Signed-off-by: Thomas Gleixner [off-list ref]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
include/linux/seqlock.h | 21 +++++++++++++++++++++
1 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index b990f6e..c6db9fb 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h@@ -69,6 +69,17 @@ static inline void write_sequnlock(seqlock_t *sl) spin_unlock(&sl->lock); } +static inline int write_tryseqlock(seqlock_t *sl) +{ + int ret = spin_trylock(&sl->lock); + + if (ret) { + ++sl->sequence; + smp_wmb(); + } + return ret; +} + /* Start of read calculation -- fetch last complete writer token */ static __always_inline unsigned read_seqbegin(const seqlock_t *sl) {
@@ -237,4 +248,14 @@ static inline void write_seqcount_barrier(seqcount_t *s) #define write_sequnlock_bh(lock) \ do { write_sequnlock(lock); local_bh_enable(); } while(0) +#define read_seqbegin_irqsave(lock, flags) \ + ({ local_irq_save(flags); read_seqbegin(lock); }) + +#define read_seqretry_irqrestore(lock, iv, flags) \ + ({ \ + int ret = read_seqretry(lock, iv); \ + local_irq_restore(flags); \ + ret; \ + }) + #endif /* __LINUX_SEQLOCK_H */
--
1.7.8.3