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

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Date:   Fri, 22 Mar 2019 10:30:05 -0400
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        uclinux-h8-devel@...ts.sourceforge.jp,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        nios2-dev@...ts.rocketboards.org, openrisc@...ts.librecores.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
        linux-arch@...r.kernel.org, x86@...nel.org,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH v5 0/3] locking/rwsem: Rwsem rearchitecture part 0

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