[PATCH 0/8] all: use find_next_*_bit() instead of find_first_*_bit() where possible

From: Yury Norov <yury.norov@gmail.com>
To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Brian Cain <bcain@codeaurora.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Jonas Bonn <jonas@southpole.se>,
	Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Heiko Carstens <hca@linux.ibm.com>, Rich Felker <dalias@libc.org>,
	David Hildenbrand <david@redhat.com>,
	Jaegeuk Kim <jaegeuk@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexander Lobakin <alobakin@pm.me>,
	Samuel Mendoza-Jonas <sam@mendozajonas.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Alexey Klimov <aklimov@redhat.com>,
	Ingo Molnar <mingo@redhat.com>
Cc: Yury Norov <yury.norov@gmail.com>
Subject: [PATCH 0/8] all: use find_next_*_bit() instead of find_first_*_bit() where possible
Date: Sat, 12 Jun 2021 05:36:31 -0700	[thread overview]
Message-ID: <20210612123639.329047-1-yury.norov@gmail.com> (raw)

find_first_*_bit() is simpler and faster than 'next' version [1], and they
work identically if start == 0. But in many cases kernel code uses the
'next' version where 'first' can be used. This series addresses this issue.

Patches 1-3 move find.h under include/linux as it simplifies development.
Patches 4-8 switch the kernel and tools to find_first_*_bit() implementation
where appropriate. 

Yury Norov (8):
  bitops: protect find_first_{,zero}_bit properly
  bitops: move find_bit_*_le functions from le.h to find.h
  include: move find.h from asm_generic to linux
  arch: remove GENERIC_FIND_FIRST_BIT entirely
  lib: add find_first_and_bit()
  cpumask: use find_first_and_bit()
  all: replace find_next{,_zero}_bit with find_first{,_zero}_bit where
    appropriate
  tools: sync tools/bitmap with mother linux

 MAINTAINERS                                   |   4 +-
 arch/alpha/include/asm/bitops.h               |   2 -
 arch/arc/Kconfig                              |   1 -
 arch/arc/include/asm/bitops.h                 |   1 -
 arch/arm/include/asm/bitops.h                 |   1 -
 arch/arm64/Kconfig                            |   1 -
 arch/arm64/include/asm/bitops.h               |   1 -
 arch/csky/include/asm/bitops.h                |   1 -
 arch/h8300/include/asm/bitops.h               |   1 -
 arch/hexagon/include/asm/bitops.h             |   1 -
 arch/ia64/include/asm/bitops.h                |   2 -
 arch/m68k/include/asm/bitops.h                |   2 -
 arch/mips/Kconfig                             |   1 -
 arch/mips/include/asm/bitops.h                |   1 -
 arch/openrisc/include/asm/bitops.h            |   1 -
 arch/parisc/include/asm/bitops.h              |   2 -
 arch/powerpc/include/asm/bitops.h             |   2 -
 arch/powerpc/platforms/pasemi/dma_lib.c       |   4 +-
 arch/riscv/include/asm/bitops.h               |   1 -
 arch/s390/Kconfig                             |   1 -
 arch/s390/include/asm/bitops.h                |   1 -
 arch/s390/kvm/kvm-s390.c                      |   2 +-
 arch/sh/include/asm/bitops.h                  |   1 -
 arch/sparc/include/asm/bitops_32.h            |   1 -
 arch/sparc/include/asm/bitops_64.h            |   2 -
 arch/x86/Kconfig                              |   1 -
 arch/x86/include/asm/bitops.h                 |   2 -
 arch/x86/um/Kconfig                           |   1 -
 arch/xtensa/include/asm/bitops.h              |   1 -
 drivers/block/rnbd/rnbd-clt.c                 |   2 +-
 drivers/dma/ti/edma.c                         |   2 +-
 drivers/iio/adc/ad7124.c                      |   2 +-
 drivers/infiniband/hw/irdma/hw.c              |  16 +-
 drivers/media/cec/core/cec-core.c             |   2 +-
 drivers/media/mc/mc-devnode.c                 |   2 +-
 drivers/pci/controller/dwc/pci-dra7xx.c       |   2 +-
 drivers/scsi/lpfc/lpfc_sli.c                  |  10 +-
 drivers/soc/ti/k3-ringacc.c                   |   4 +-
 drivers/tty/n_tty.c                           |   2 +-
 drivers/virt/acrn/ioreq.c                     |   3 +-
 fs/f2fs/segment.c                             |   8 +-
 fs/ocfs2/cluster/heartbeat.c                  |   2 +-
 fs/ocfs2/dlm/dlmdomain.c                      |   4 +-
 fs/ocfs2/dlm/dlmmaster.c                      |  18 +--
 fs/ocfs2/dlm/dlmrecovery.c                    |   2 +-
 fs/ocfs2/dlm/dlmthread.c                      |   2 +-
 include/asm-generic/bitops.h                  |   1 -
 include/asm-generic/bitops/le.h               |  64 --------
 include/linux/bitmap.h                        |   1 +
 include/linux/cpumask.h                       |  30 ++--
 .../bitops => include/linux}/find.h           | 149 +++++++++++++++++-
 lib/Kconfig                                   |   3 -
 lib/find_bit.c                                |  21 +++
 lib/find_bit_benchmark.c                      |  21 +++
 lib/genalloc.c                                |   2 +-
 net/ncsi/ncsi-manage.c                        |   4 +-
 tools/include/asm-generic/bitops.h            |   1 -
 tools/include/linux/bitmap.h                  |   7 +-
 .../bitops => tools/include/linux}/find.h     |  54 +++++--
 tools/lib/find_bit.c                          |  20 +++
 60 files changed, 319 insertions(+), 185 deletions(-)
 rename {tools/include/asm-generic/bitops => include/linux}/find.h (50%)
 rename {include/asm-generic/bitops => tools/include/linux}/find.h (83%)

-- 
2.30.2