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Use identical memory barrier implementations on 32 and 64 bit Intel CPUs.
In the past the Linux kernel supported 32 bit CPUs that violate the x86
ordering standard. Since io_uring is not supported by these older kernels,
do not support these older CPUs in liburing. See also Linux kernel commit
5927145efd5d ("x86/cpu: Remove the CONFIG_X86_PPRO_FENCE=y quirk") # v4.16.
Cc: Roman Penyaev <rpenyaev@suse.de>
Suggested-by: Roman Penyaev <rpenyaev@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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This patch improves consistency with the Linux kernel source code.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Introduce the smp_load_acquire() and smp_store_release() macros. Fix
synchronization in io_uring_cq_advance() and __io_uring_get_cqe().
Remove a superfluous local variable, if-test and write barrier from
__io_uring_submit(). Remove a superfluous barrier from
test/io_uring_enter.c.
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Roman Penyaev <rpenyaev@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Signed-off-by: Jens Axboe <axboe@kernel.dk>
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