Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [RFC PATCH 4/6] seqlock: Add raw_seqbegin() for non-waiting readers | Date | Wed, 21 Aug 2013 18:42:19 +0200 |
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Add the seqlock version of raw_seqcount_begin() for readers that can't wait for writers to complete their update and who can live with seqlock read acquirement failure.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Don Zickus <dzickus@redhat.com> --- include/linux/seqlock.h | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index 1829905..aa845de 100644 --- a/include/linux/seqlock.h +++ b/include/linux/seqlock.h @@ -203,6 +203,11 @@ static inline unsigned read_seqbegin(const seqlock_t *sl) return read_seqcount_begin(&sl->seqcount); } +static inline unsigned raw_seqbegin(const seqlock_t *sl) +{ + return raw_seqcount_begin(&sl->seqcount); +} + static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start) { return read_seqcount_retry(&sl->seqcount, start); -- 1.7.5.4
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