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	RISC-V: Add CONFIG_HVC_RISCV_SBI=y to defconfig	2018-06-11 09:16:24 -07:00
include	atomics/treewide: Make atomic_fetch_add_unless() optional	2018-06-21 14:22:33 +02:00
kernel	RISC-V Updates for the 4.18 Merge Window	2018-06-16 06:42:43 +09:00
lib	RISC-V: Make our port sparse-clean	2018-06-11 09:09:49 -07:00
mm	RISC-V changes for 4.16	2018-02-07 11:33:08 -08:00
Kconfig	RISC-V Updates for the 4.18 Merge Window	2018-06-16 06:42:43 +09:00
Makefile	riscv: add riscv-specific predefines to CHECKFLAGS	2018-06-11 09:03:43 -07:00