From: Pavel Begunkov <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Subject: [PATCH v2 1/2] barriers: add load relaxed
Date: Sun, 21 Jun 2020 19:14:25 +0300 [thread overview]
Message-ID: <f7de9c7842c666cfe7b255224bd934427274b465.1592755912.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1592755912.git.asml.silence@gmail.com>
Add io_uring_smp_load_relaxed() for internal use.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
src/include/liburing/barrier.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/include/liburing/barrier.h b/src/include/liburing/barrier.h
index ad69506..6a1aa52 100644
--- a/src/include/liburing/barrier.h
+++ b/src/include/liburing/barrier.h
@@ -47,6 +47,8 @@ do { \
___p1; \
})
+#define io_uring_smp_load_relaxed(p) IO_URING_READ_ONCE(*(p))
+
#else /* defined(__x86_64__) || defined(__i386__) */
/*
* Add arch appropriate definitions. Use built-in atomic operations for
@@ -55,6 +57,8 @@ do { \
#define io_uring_smp_store_release(p, v) \
__atomic_store_n(p, v, __ATOMIC_RELEASE)
#define io_uring_smp_load_acquire(p) __atomic_load_n(p, __ATOMIC_ACQUIRE)
+#define io_uring_smp_load_relaxed(p) __atomic_load_n(p, __ATOMIC_RELAXED)
+
#endif /* defined(__x86_64__) || defined(__i386__) */
#endif /* defined(LIBURING_BARRIER_H) */
--
2.24.0
next prev parent reply other threads:[~2020-06-21 16:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-21 16:14 [PATCH v2 0/2] Fix hang in io_uring_get_cqe() with iopoll Pavel Begunkov
2020-06-21 16:14 ` Pavel Begunkov [this message]
2020-06-21 16:14 ` [PATCH v2 2/2] " Pavel Begunkov
2020-06-21 18:48 ` [PATCH v2 0/2] " Jens Axboe
2020-06-21 19:54 ` Pavel Begunkov
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