Introduce and use generic parity16/32/64 helper
| From: | Kuan-Wei Chiu <visitorckw-AT-gmail.com> | |
| To: | tglx-AT-linutronix.de, mingo-AT-redhat.com, bp-AT-alien8.de, dave.hansen-AT-linux.intel.com, x86-AT-kernel.org, jk-AT-ozlabs.org, joel-AT-jms.id.au, eajames-AT-linux.ibm.com, andrzej.hajda-AT-intel.com, neil.armstrong-AT-linaro.org, rfoss-AT-kernel.org, maarten.lankhorst-AT-linux.intel.com, mripard-AT-kernel.org, tzimmermann-AT-suse.de, airlied-AT-gmail.com, simona-AT-ffwll.ch, dmitry.torokhov-AT-gmail.com, mchehab-AT-kernel.org, awalls-AT-md.metrocast.net, hverkuil-AT-xs4all.nl, miquel.raynal-AT-bootlin.com, richard-AT-nod.at, vigneshr-AT-ti.com, louis.peens-AT-corigine.com, andrew+netdev-AT-lunn.ch, davem-AT-davemloft.net, edumazet-AT-google.com, pabeni-AT-redhat.com, parthiban.veerasooran-AT-microchip.com, arend.vanspriel-AT-broadcom.com, johannes-AT-sipsolutions.net, gregkh-AT-linuxfoundation.org, jirislaby-AT-kernel.org, yury.norov-AT-gmail.com, akpm-AT-linux-foundation.org | |
| Subject: | [PATCH v2 00/18] Introduce and use generic parity16/32/64 helper | |
| Date: | Sat, 01 Mar 2025 22:23:51 +0800 | |
| Message-ID: | <20250301142409.2513835-1-visitorckw@gmail.com> | |
| Cc: | hpa-AT-zytor.com, alistair-AT-popple.id.au, linux-AT-rasmusvillemoes.dk, Laurent.pinchart-AT-ideasonboard.com, jonas-AT-kwiboo.se, jernej.skrabec-AT-gmail.com, kuba-AT-kernel.org, linux-kernel-AT-vger.kernel.org, linux-fsi-AT-lists.ozlabs.org, dri-devel-AT-lists.freedesktop.org, linux-input-AT-vger.kernel.org, linux-media-AT-vger.kernel.org, linux-mtd-AT-lists.infradead.org, oss-drivers-AT-corigine.com, netdev-AT-vger.kernel.org, linux-wireless-AT-vger.kernel.org, brcm80211-AT-lists.linux.dev, brcm80211-dev-list.pdl-AT-broadcom.com, linux-serial-AT-vger.kernel.org, bpf-AT-vger.kernel.org, jserv-AT-ccns.ncku.edu.tw, david.laight.linux-AT-gmail.com, andrew.cooper3-AT-citrix.com, Kuan-Wei Chiu <visitorckw-AT-gmail.com>, Yu-Chun Lin <eleanor15x-AT-gmail.com> | |
| Archive-link: | Article |
Several parts of the kernel contain redundant implementations of parity
calculations for 16/32/64-bit values. Introduces generic
parity16/32/64() helpers in bitops.h, providing a standardized
and optimized implementation.
Subsequent patches refactor various kernel components to replace
open-coded parity calculations with the new helpers, reducing code
duplication and improving maintainability.
Co-developed-by: Yu-Chun Lin <eleanor15x@gmail.com>
Signed-off-by: Yu-Chun Lin <eleanor15x@gmail.com>
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
---
This patch series is based on next-20250228.
Changes in v2:
- Provide fallback functions for __builtin_parity() when the compiler
decides not to inline it
- Use __builtin_parity() when no architecture-specific implementation
is available
- Optimize for constant folding when val is a compile-time constant
- Add a generic parity() macro
- Drop the x86 bootflag conversion patch since it has been merged into
the tip tree
Kuan-Wei Chiu (18):
lib/parity: Add __builtin_parity() fallback implementations
bitops: Optimize parity8() using __builtin_parity()
bitops: Add parity16(), parity32(), and parity64() helpers
media: media/test_drivers: Replace open-coded parity calculation with
parity8()
media: pci: cx18-av-vbi: Replace open-coded parity calculation with
parity8()
media: saa7115: Replace open-coded parity calculation with parity8()
serial: max3100: Replace open-coded parity calculation with parity8()
lib/bch: Replace open-coded parity calculation with parity32()
Input: joystick - Replace open-coded parity calculation with
parity32()
net: ethernet: oa_tc6: Replace open-coded parity calculation with
parity32()
wifi: brcm80211: Replace open-coded parity calculation with parity32()
drm/bridge: dw-hdmi: Replace open-coded parity calculation with
parity32()
mtd: ssfdc: Replace open-coded parity calculation with parity32()
fsi: i2cr: Replace open-coded parity calculation with parity32()
fsi: i2cr: Replace open-coded parity calculation with parity64()
Input: joystick - Replace open-coded parity calculation with
parity64()
nfp: bpf: Replace open-coded parity calculation with parity64()
bitops: Add parity() macro for automatic type-based selection
drivers/fsi/fsi-master-i2cr.c | 18 +--
.../drm/bridge/synopsys/dw-hdmi-ahb-audio.c | 8 +-
drivers/input/joystick/grip_mp.c | 17 +--
drivers/input/joystick/sidewinder.c | 24 +---
drivers/media/i2c/saa7115.c | 12 +-
drivers/media/pci/cx18/cx18-av-vbi.c | 12 +-
.../media/test-drivers/vivid/vivid-vbi-gen.c | 8 +-
drivers/mtd/ssfdc.c | 17 +--
drivers/net/ethernet/netronome/nfp/nfp_asm.c | 7 +-
drivers/net/ethernet/oa_tc6.c | 19 +--
.../broadcom/brcm80211/brcmsmac/dma.c | 16 +--
drivers/tty/serial/max3100.c | 3 +-
include/linux/bitops.h | 115 ++++++++++++++++--
lib/Makefile | 2 +-
lib/bch.c | 14 +--
lib/parity.c | 48 ++++++++
16 files changed, 185 insertions(+), 155 deletions(-)
create mode 100644 lib/parity.c
--
2.34.1