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| author | Andrea Parri <parri.andrea@gmail.com> | 2018-02-20 19:45:56 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-21 10:12:29 +0100 |
| commit | cb13b424e986aed68d74cbaec3449ea23c50e167 (patch) | |
| tree | 853b0d99f04da0e569ea74f016686f0b7d51800e /certs/blacklist_hashes.c | |
| parent | 88e77dc6a354095ddaaae715bc0d3b55702fa3db (diff) | |
| download | linux-cb13b424e986aed68d74cbaec3449ea23c50e167.tar.bz2 | |
locking/xchg/alpha: Add unconditional memory barrier to cmpxchg()
Continuing along with the fight against smp_read_barrier_depends() [1]
(or rather, against its improper use), add an unconditional barrier to
cmpxchg. This guarantees that dependency ordering is preserved when a
dependency is headed by an unsuccessful cmpxchg. As it turns out, the
change could enable further simplification of LKMM as proposed in [2].
[1] https://marc.info/?l=linux-kernel&m=150884953419377&w=2
https://marc.info/?l=linux-kernel&m=150884946319353&w=2
https://marc.info/?l=linux-kernel&m=151215810824468&w=2
https://marc.info/?l=linux-kernel&m=151215816324484&w=2
[2] https://marc.info/?l=linux-kernel&m=151881978314872&w=2
Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-alpha@vger.kernel.org
Link: http://lkml.kernel.org/r/1519152356-4804-1-git-send-email-parri.andrea@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'certs/blacklist_hashes.c')
0 files changed, 0 insertions, 0 deletions