[PATCH v5 0/3] locking/rwsem: Rwsem rearchitecture part 0

Waiman Long
2019-03-22T14:30:25Z

v5:
- Rebase to the latest v5.1 tree and fix conflicts in
arch/{xtensa,s390}/include/asm/Kbuild.

v4:
- Remove rwsem-spinlock.c and make all archs use rwsem-xadd.c.

v3:
- Optimize __down_read_trylock() for the uncontended case as suggested
by Linus.

v2:
- Add patch 2 to optimize __down_read_trylock() as suggested by PeterZ.
- Update performance test data in patch 1.

The goal of this patchset is to remove the architecture specific files
for rwsem-xadd to make it easer to add enhancements in the later rwsem
patches. It also removes the legacy rwsem-spinlock.c file and make all
the architectures use one single implementation of rwsem - rwsem-xadd.c.

Waiman Long (3):
locking/rwsem: Remove arch specific rwsem files
locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all
archs
locking/rwsem: Optimize down_read_trylock()

MAINTAINERS | 1 -
arch/alpha/Kconfig | 7 -
arch/alpha/include/asm/rwsem.h | 211 --------------------
arch/arc/Kconfig | 3 -
arch/arm/Kconfig | 4 -
arch/arm/include/asm/Kbuild | 1 -
arch/arm64/Kconfig | 3 -
arch/arm64/include/asm/Kbuild | 1 -
arch/c6x/Kconfig | 3 -
arch/csky/Kconfig | 3 -
arch/h8300/Kconfig | 3 -
arch/hexagon/Kconfig | 6 -
arch/hexagon/include/asm/Kbuild | 1 -
arch/ia64/Kconfig | 4 -
arch/ia64/include/asm/rwsem.h | 172 ----------------
arch/m68k/Kconfig | 7 -
arch/microblaze/Kconfig | 6 -
arch/mips/Kconfig | 7 -
arch/nds32/Kconfig | 3 -
arch/nios2/Kconfig | 3 -
arch/openrisc/Kconfig | 6 -
arch/parisc/Kconfig | 6 -
arch/powerpc/Kconfig | 7 -
arch/powerpc/include/asm/Kbuild | 1 -
arch/riscv/Kconfig | 3 -
arch/s390/Kconfig | 6 -
arch/s390/include/asm/Kbuild | 1 -
arch/sh/Kconfig | 6 -
arch/sh/include/asm/Kbuild | 1 -
arch/sparc/Kconfig | 8 -
arch/sparc/include/asm/Kbuild | 1 -
arch/unicore32/Kconfig | 6 -
arch/x86/Kconfig | 3 -
arch/x86/include/asm/rwsem.h | 237 ----------------------
arch/x86/lib/Makefile | 1 -
arch/x86/lib/rwsem.S | 156 ---------------
arch/x86/um/Kconfig | 6 -
arch/x86/um/Makefile | 1 -
arch/xtensa/Kconfig | 3 -
arch/xtensa/include/asm/Kbuild | 1 -
include/asm-generic/rwsem.h | 140 -------------
include/linux/rwsem-spinlock.h | 47 -----
include/linux/rwsem.h | 9 +-
kernel/Kconfig.locks | 2 +-
kernel/locking/Makefile | 4 +-
kernel/locking/percpu-rwsem.c | 2 +
kernel/locking/rwsem-spinlock.c | 339 --------------------------------
kernel/locking/rwsem.h | 130 ++++++++++++
48 files changed, 135 insertions(+), 1447 deletions(-)
delete mode 100644 arch/alpha/include/asm/rwsem.h
delete mode 100644 arch/ia64/include/asm/rwsem.h
delete mode 100644 arch/x86/include/asm/rwsem.h
delete mode 100644 arch/x86/lib/rwsem.S
delete mode 100644 include/asm-generic/rwsem.h
delete mode 100644 include/linux/rwsem-spinlock.h
delete mode 100644 kernel/locking/rwsem-spinlock.c

--
2.18.1