linux-kernel - [PATCH 00/21] lib: add alternatives for GENMASK()

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Message-ID: <20251025162858.305236-1-yury.norov@gmail.com>
Date: Sat, 25 Oct 2025 12:28:36 -0400
From: "Yury Norov (NVIDIA)" <yury.norov@...il.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: "Yury Norov (NVIDIA)" <yury.norov@...il.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 00/21] lib: add alternatives for GENMASK()

GENMASK(high, low) notation reflects a common pattern to describe
hardware registers. However, out of drivers context it's confusing and
error-prone. 

This series introduces alternatives for GENMASK():

 - BITS(low, high);
 - FIRST_BITS(nbits);
 - LAST_BITS(start);

Patches 1-6 and 8 rename existing local BITS(). Patches 7 and 9 introduce
new generic macros. Patches 10-18 switch GENMASK() usage in core files to
better alternatives. Patch 19 adds Documentation section describing
preferred parameters ordering.

The series is inspired by:

https://lore.kernel.org/all/CAHk-=whoOUsqPKb7OQwhQf9H_3=5sXGPJrDbfQfwLB3Bi13tcQ@mail.gmail.com/

Yury Norov (NVIDIA) (21):
  arc: disasm: rename BITS() for FIELD()
  iwlwifi: drop unused BITS()
  select: rename BITS() to FDS_BITS()
  ALSA: rename BITS to R_BITS
  zlib: BITS() to LOWBITS()
  mfd: prepare to generalize BITS() macro
  bits: Add BITS() macro
  mfd: drop local BITS() macro
  bits: generalize BITMAP_{FIRST,LAST}_WORD_MASK
  i2c: nomadik: don't use GENMASK()
  drivers: don't use GENMASK() in FIELD_PREP_WM16()
  bitmap: don't use GENMASK()
  trace: don't use GENMASK()
  lib: 842: don't use GENMASK_ULL()
  bpf: don't use GENMASK()
  kcsan: don't use GENMASK()
  mm: don't use GENMASK()
  fprobe: don't use GENMASK()
  fs: don't use GENMASK()
  fortify-string: don't use GENMASK()
  Docs: add Functions parameters order section

 Documentation/process/coding-style.rst        | 48 ++++++++++++++
 arch/arc/include/asm/disasm.h                 | 62 +++++++++----------
 arch/arc/kernel/disasm.c                      | 46 +++++++-------
 drivers/gpu/drm/rockchip/rockchip_lvds.h      |  2 +-
 drivers/gpu/drm/rockchip/rockchip_vop2_reg.c  |  4 +-
 drivers/i2c/busses/i2c-nomadik.c              | 44 ++++++-------
 .../platform/synopsys/hdmirx/snps_hdmirx.h    |  4 +-
 drivers/mfd/db8500-prcmu-regs.h               |  2 -
 drivers/mmc/host/dw_mmc-rockchip.c            |  4 +-
 .../net/wireless/intel/iwlwifi/fw/api/coex.h  |  2 -
 drivers/soc/rockchip/grf.c                    |  4 +-
 fs/erofs/internal.h                           |  2 +-
 fs/f2fs/data.c                                |  2 +-
 fs/f2fs/inode.c                               |  2 +-
 fs/f2fs/segment.c                             |  2 +-
 fs/f2fs/super.c                               |  2 +-
 fs/proc/task_mmu.c                            |  2 +-
 fs/resctrl/pseudo_lock.c                      |  2 +-
 fs/select.c                                   |  6 +-
 include/asm-generic/fprobe.h                  |  7 +--
 include/linux/bitmap.h                        | 11 ++--
 include/linux/bits.h                          | 11 ++++
 include/linux/f2fs_fs.h                       |  2 +-
 include/linux/find.h                          | 34 +++++-----
 include/linux/fortify-string.h                |  4 +-
 kernel/bpf/verifier.c                         |  4 +-
 kernel/kcsan/encoding.h                       |  4 +-
 kernel/trace/fgraph.c                         | 10 +--
 kernel/trace/trace_probe.h                    |  2 +-
 lib/842/842_compress.c                        |  2 +-
 lib/842/842_decompress.c                      |  2 +-
 lib/bitmap.c                                  |  2 +-
 lib/test_bitmap.c                             | 14 ++---
 lib/zlib_inflate/inflate.c                    | 48 +++++++-------
 mm/debug_vm_pgtable.c                         |  2 +-
 sound/core/oss/rate.c                         | 12 ++--
 sound/soc/rockchip/rockchip_i2s_tdm.h         |  2 +-
 37 files changed, 235 insertions(+), 180 deletions(-)

-- 
2.43.0