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The following two commits:79d442461d("locking/xchg/alpha: Clean up barrier usage by using smp_mb() in place of __ASM__MB")472e8c55cf("locking/xchg/alpha: Fix xchg() and cmpxchg() memory ordering bugs") ... ended up adding unnecessary barriers to the _local() variants on Alpha, which the previous code took care to avoid. Fix them by adding the smp_mb() into the cmpxchg() macro rather than into the ____cmpxchg() variants. Reported-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrea Parri <parri.andrea@gmail.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-alpha@vger.kernel.org Fixes:472e8c55cf("locking/xchg/alpha: Fix xchg() and cmpxchg() memory ordering bugs") Fixes:79d442461d("locking/xchg/alpha: Clean up barrier usage by using smp_mb() in place of __ASM__MB") Link: http://lkml.kernel.org/r/1519704058-13430-1-git-send-email-parri.andrea@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.