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linux-next/arch/hexagon
Mark Rutland eccc2da8c0 atomics/treewide: Make atomic_fetch_add_unless() optional
Several architectures these have a near-identical implementation based
on atomic_read() and atomic_cmpxchg() which we can instead define in
<linux/atomic.h>, so let's do so, using something close to the existing
x86 implementation with try_cmpxchg().

Where an architecture provides its own atomic_fetch_add_unless(), it
must define a preprocessor symbol for it. The instrumented atomics are
updated accordingly.

Note that arch/arc's existing atomic_fetch_add_unless() had redundant
barriers, as these are already present in its atomic_cmpxchg()
implementation.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Palmer Dabbelt <palmer@sifive.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineet Gupta <vgupta@synopsys.com>
Link: https://lore.kernel.org/lkml/20180621121321.4761-7-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-06-21 14:22:33 +02:00
..
configs Hexagon: Comet platform support 2011-11-01 07:34:21 -07:00
include atomics/treewide: Make atomic_fetch_add_unless() optional 2018-06-21 14:22:33 +02:00
kernel hexagon: fix printk format warning in setup.c 2018-06-15 07:55:25 +09:00
lib hexagon: export csum_partial_copy_nocheck 2018-05-01 15:49:50 -05:00
mm hexagon: drop the unused variable zero_page_mask 2018-06-15 07:55:25 +09:00
Kconfig scatterlist: move the NEED_SG_DMA_LENGTH config symbol to lib/Kconfig 2018-05-09 06:55:59 +02:00
Makefile Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00