Andrea Parri 7505779c61 locking/xchg/alpha: Add unconditional memory barrier to cmpxchg() ... [ Upstream commit cb13b424e986aed68d74cbaec3449ea23c50e167 ] 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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-05-30 07:48:59 +02:00
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alpha	locking/xchg/alpha: Add unconditional memory barrier to cmpxchg()	2018-05-30 07:48:59 +02:00
arc	ARC: Fix malformed ARC_EMUL_UNALIGNED default	2018-05-30 07:48:58 +02:00
arm	ARM: OMAP1: clock: Fix debugfs_create_*() usage	2018-05-30 07:48:59 +02:00
arm64	arm64: spinlock: Fix theoretical trylock() A-B-A with LSE atomics	2018-05-30 07:48:56 +02:00
avr32
blackfin
c6x
cris
frv	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
h8300
hexagon	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
ia64	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
m32r
m68k
metag
microblaze	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
mips	MIPS: TXx9: use IS_BUILTIN() for CONFIG_LEDS_CLASS	2018-05-30 07:48:56 +02:00
mn10300
nios2
openrisc
parisc	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
powerpc	powerpc/numa: Ensure nodes initialized for hotplug	2018-05-30 07:48:54 +02:00
s390	s390: use expoline thunks in the BPF JIT	2018-05-26 08:48:59 +02:00
score
sh	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
sparc	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
tile	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
um
unicore32
x86	x86/power: Fix swsusp_arch_resume prototype	2018-05-30 07:48:55 +02:00
xtensa	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
.gitignore
Kconfig