Hi, This series contains long due update to ARC atomics, discussed back in 2018 [1] and [2]. I had them for arc64 port and decided to post them here for some review and inclusion, after Mark's rework. The main changes are use of relaxed atomics and generic bitops. Latter does cause some cogen bloat on ARC due to signed args but that can be reviewd seperately consider cross-arch impact. The changes survive glibc testsuite with no regressions whatsoever. Please review and provide any feedback. Thx, -Vineet [1] https://lore.kernel.org/r/20180830144344.GW24142@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx [2] https://lore.kernel.org/r/20180830135749.GA13005@xxxxxxx Vineet Gupta (10): ARC: atomics: disintegrate header ARC: atomic: !LLSC: remove hack in atomic_set() for for UP ARC: atomic: !LLSC: use int data type consistently ARC: atomic64: LLSC: elide unused atomic_{and,or,xor,andnot}_return ARC: atomics: implement relaxed variants ARC: bitops: fls/ffs to take int (vs long) per asm-generic defines ARC: xchg: !LLSC: remove UP micro-optimization/hack ARC: cmpxchg/xchg: rewrite as macros to make type safe ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only) ARC: atomic_cmpxchg/atomic_xchg: implement relaxed variants Will Deacon (1): ARC: switch to generic bitops arch/arc/include/asm/atomic-llsc.h | 97 ++++++ arch/arc/include/asm/atomic-spinlock.h | 102 ++++++ arch/arc/include/asm/atomic.h | 444 ++----------------------- arch/arc/include/asm/atomic64-arcv2.h | 250 ++++++++++++++ arch/arc/include/asm/bitops.h | 188 +---------- arch/arc/include/asm/cmpxchg.h | 233 ++++++------- arch/arc/include/asm/smp.h | 14 - arch/arc/kernel/smp.c | 2 - 8 files changed, 588 insertions(+), 742 deletions(-) create mode 100644 arch/arc/include/asm/atomic-llsc.h create mode 100644 arch/arc/include/asm/atomic-spinlock.h create mode 100644 arch/arc/include/asm/atomic64-arcv2.h -- 2.25.1
