Hi all, This is version two of the patches I posted yesterday:
http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/534666.html I'd normally leave it longer before posting again, but Peter had a good suggestion to rework the layout of the lock word, so I wanted to post a version that follows that approach. I've updated my branch if you're after the full patch stack: git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git qrwlock As before, all comments (particularly related to testing and performance) welcome! Cheers, Will --->8 Will Deacon (5): kernel/locking: Use struct qrwlock instead of struct __qrwlock locking/atomic: Add atomic_cond_read_acquire kernel/locking: Use atomic_cond_read_acquire when spinning in qrwlock arm64: locking: Move rwlock implementation over to qrwlocks kernel/locking: Prevent slowpath writers getting held up by fastpath arch/arm64/Kconfig | 17 ++++ arch/arm64/include/asm/Kbuild | 1 + arch/arm64/include/asm/spinlock.h | 164 +------------------------------- arch/arm64/include/asm/spinlock_types.h | 6 +- include/asm-generic/atomic-long.h | 3 + include/asm-generic/qrwlock.h | 20 +--- include/asm-generic/qrwlock_types.h | 15 ++- include/linux/atomic.h | 4 + kernel/locking/qrwlock.c | 83 +++------------- 9 files changed, 58 insertions(+), 255 deletions(-) -- 2.1.4
