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

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Message-ID: <aPz8rC-F_xYrf03N@yury>
Date: Sat, 25 Oct 2025 12:37:00 -0400
From: Yury Norov <yury.norov@...il.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/21] lib: add alternatives for GENMASK()

Please disregard it. The patches 8-21 have the TO list corrupted. I'll
resend shortly.

On Sat, Oct 25, 2025 at 12:28:36PM -0400, Yury Norov (NVIDIA) wrote:
> 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