seqlock: provide the same ordering semantics as mainline
[ Upstream commit afa4c06b89a3c0fb7784ff900ccd707bef519cb7 ] The mainline implementation of read_seqbegin() orders prior loads w.r.t. the read-side critical section. Fixup the RT writer-boosting implementation to provide the same guarantee. Also, while we're here, update the usage of ACCESS_ONCE() to use READ_ONCE(). Fixes: e69f15cf77c23 ("seqlock: Prevent rt starvation") Cc: stable-rt@vger.kernel.org Signed-off-by:Julia Cartwright <julia@ni.com> Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org>
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