Hello! There is no agreed-upon definition of spin_unlock_wait()'s semantics, and it appears that all callers could do just as well with a lock/unlock pair. This series therefore removes spin_unlock_wait() and changes its users to instead use a lock/unlock pair. The commits are as follows, in three groups: 1-7. Change uses of spin_unlock_wait() and raw_spin_unlock_wait() to instead use a spin_lock/spin_unlock pair. These may be applied in any order, but must be applied before any later commits in this series. The commit logs state why I believe that these commits won't noticeably degrade performance. 8. Remove core-kernel definitions for spin_unlock_wait() and raw_spin_unlock_wait(). 9. Remove arch-specific definitions of arch_spin_unlock_wait(). Changes since v2: o Add comment-only update from Manfred. Changes since v1: o Disable interrupts where needed, thus avoiding embarrassing interrupt-based self-deadlocks. o Substitute Manfred's patch for contrack_lock (#1 above). o Substitute Oleg's patch for task_work (#2 above). o Use more efficient barrier based on Arnd Bergmann feedback. o Merge the arch commits. Thanx, Paul ------------------------------------------------------------------------ arch/alpha/include/asm/spinlock.h | 5 - arch/arc/include/asm/spinlock.h | 5 - arch/arm/include/asm/spinlock.h | 16 ---- arch/arm64/include/asm/spinlock.h | 58 +---------------- arch/blackfin/include/asm/spinlock.h | 5 - arch/hexagon/include/asm/spinlock.h | 5 - arch/ia64/include/asm/spinlock.h | 21 ------ arch/m32r/include/asm/spinlock.h | 5 - arch/metag/include/asm/spinlock.h | 5 - arch/mips/include/asm/spinlock.h | 16 ---- arch/mn10300/include/asm/spinlock.h | 5 - arch/parisc/include/asm/spinlock.h | 7 -- arch/powerpc/include/asm/spinlock.h | 33 --------- arch/s390/include/asm/spinlock.h | 7 -- arch/sh/include/asm/spinlock-cas.h | 5 - arch/sh/include/asm/spinlock-llsc.h | 5 - arch/sparc/include/asm/spinlock_32.h | 5 - arch/sparc/include/asm/spinlock_64.h | 5 - arch/tile/include/asm/spinlock_32.h | 2 arch/tile/include/asm/spinlock_64.h | 2 arch/tile/lib/spinlock_32.c | 23 ------ arch/tile/lib/spinlock_64.c | 22 ------ arch/xtensa/include/asm/spinlock.h | 5 - drivers/ata/libata-eh.c | 8 -- include/asm-generic/qspinlock.h | 14 ---- include/linux/spinlock.h | 31 --------- include/linux/spinlock_up.h | 6 - ipc/sem.c | 3 kernel/exit.c | 3 kernel/locking/qspinlock.c | 117 ----------------------------------- kernel/sched/completion.c | 9 -- kernel/sched/core.c | 5 - kernel/task_work.c | 8 -- net/netfilter/nf_conntrack_core.c | 52 ++++++++------- 34 files changed, 48 insertions(+), 475 deletions(-)
