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Date: Mon, 22 Nov 2021 18:50:19 +0100
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Tony Lindgren <tony@...mide.com>,
Russell King <linux@...linux.org.uk>,
Rajendra Nayak <rnayak@...eaurora.org>,
Paul Walmsley <paul@...an.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Ludovic Desroches <ludovic.desroches@...rochip.com>,
Tero Kristo <kristo@...nel.org>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
Benoit Parrot <bparrot@...com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Andrew Jeffery <andrew@...id.au>,
Ulf Hansson <ulf.hansson@...aro.org>,
Joel Stanley <joel@....id.au>,
Ping-Ke Shih <pkshih@...ltek.com>,
Kalle Valo <kvalo@...eaurora.org>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Magnus Damm <magnus.damm@...il.com>,
Eduardo Valentin <edubezval@...il.com>,
Keerthy <j-keerthy@...com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
linux-renesas-soc@...r.kernel.org, linux-iio@...r.kernel.org,
linux-media@...r.kernel.org, linux-mmc@...r.kernel.org,
linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org,
linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-pm@...r.kernel.org,
alsa-devel@...a-project.org
Subject: Re: [PATCH 00/17] Non-const bitfield helper conversions
On 22/11/2021 16:53:53+0100, Geert Uytterhoeven wrote:
> Hi all,
>
> <linux/bitfield.h> contains various helpers for accessing bitfields, as
> typically used in hardware registers for memory-mapped I/O blocks. These
> helpers ensure type safety, and deduce automatically shift values from
> mask values, avoiding mistakes due to inconsistent shifts and masks, and
> leading to a reduction in source code size.
>
> I have already submitted a few conversions to the FIELD_{GET,PREP}()
> helpers that were fixes for real bugs:
> - [PATCH] mips: cm: Convert to bitfield API to fix out-of-bounds
> access
> https://lore.kernel.org/r/0471c545117c5fa05bd9c73005cda9b74608a61e.1635501373.git.geert+renesas@glider.be
> - [PATCH] drm/armada: Fix off-by-one error in
> armada_overlay_get_property()
> https://lore.kernel.org/r/5818c8b04834e6a9525441bc181580a230354b69.1635501237.git.geert+renesas@glider.be
>
> Plus several patches for normal conversions:
> - [PATCH] ARM: ptrace: Use bitfield helpers
> https://lore.kernel.org/r/a1445d3abb45cfc95cb1b03180fd53caf122035b.1637593297.git.geert+renesas@glider.be
> - [PATCH] MIPS: CPC: Use bitfield helpers
> https://lore.kernel.org/r/35f0f17e3d987afaa9cd09cdcb8131d42a53c3e1.1637593297.git.geert+renesas@glider.be
> - [PATCH] MIPS: CPS: Use bitfield helpers
> https://lore.kernel.org/r/8bd8b1b9a3787e594285addcf2057754540d0a5f.1637593297.git.geert+renesas@glider.be
> - [PATCH] crypto: sa2ul - Use bitfield helpers
> https://lore.kernel.org/r/ca89d204ef2e40193479db2742eadf0d9cf3c0ff.1637593297.git.geert+renesas@glider.be
> - [PATCH] dmaengine: stm32-mdma: Use bitfield helpers
> https://lore.kernel.org/r/36ceab242a594233dc7dc6f1dddb4ac32d1e846f.1637593297.git.geert+renesas@glider.be
> - [PATCH] intel_th: Use bitfield helpers
> https://lore.kernel.org/r/b1e4f027aa88acfbdfaa771b0920bd1d977828ba.1637593297.git.geert+renesas@glider.be
> - [PATCH] Input: palmas-pwrbutton - use bitfield helpers
> https://lore.kernel.org/r/f8831b88346b36fc6e01e0910d0db6c94287d2b4.1637593297.git.geert+renesas@glider.be
> - [PATCH] irqchip/mips-gic: Use bitfield helpers
> https://lore.kernel.org/r/74f9d126961a90d3e311b92a54870eaac5b3ae57.1637593297.git.geert+renesas@glider.be
> - [PATCH] mfd: mc13xxx: Use bitfield helpers
> https://lore.kernel.org/r/afa46868cf8c1666e9cbbbec42767ca2294b024d.1637593297.git.geert+renesas@glider.be
> - [PATCH] regulator: lp873x: Use bitfield helpers
> https://lore.kernel.org/r/44d60384b640c8586b4ca7edbc9287a34ce21c5b.1637593297.git.geert+renesas@glider.be
> - [PATCH] regulator: lp87565: Use bitfield helpers
> https://lore.kernel.org/r/941c2dfd5b5b124b8950bcce42db4c343dfe9821.1637593297.git.geert+renesas@glider.be
>
> The existing FIELD_{GET,PREP}() macros are limited to compile-time
> constants. However, it is very common to prepare or extract bitfield
> elements where the bitfield mask is not a compile-time constant.
> To avoid this limitation, the AT91 clock driver already has its own
> field_{prep,get}() macros.
>
My understanding was that this (being compile time only) was actually
done on purpose. Did I misunderstand?
> This patch series makes them available for general use, and converts
> several drivers to the existing FIELD_{GET,PREP}() and the new
> field_{get,prep}() helpers.
>
> I can take the first two patches through the reneas-clk tree for v5.17,
> but probably it is best for the remaining patches to be postponed to
> v5.18.
>
> Thanks for your comments!
>
> Geert Uytterhoeven (17):
> bitfield: Add non-constant field_{prep,get}() helpers
> clk: renesas: Use bitfield helpers
> [RFC] soc: renesas: Use bitfield helpers
> [RFC] ARM: OMAP2+: Use bitfield helpers
> [RFC] bus: omap_l3_noc: Use bitfield helpers
> [RFC] clk: ti: Use bitfield helpers
> [RFC] iio: st_sensors: Use bitfield helpers
> [RFC] iio: humidity: hts221: Use bitfield helpers
> [RFC] iio: imu: st_lsm6dsx: Use bitfield helpers
> [RFC] media: ti-vpe: cal: Use bitfield helpers
> [RFC] mmc: sdhci-of-aspeed: Use bitfield helpers
> [RFC] pinctrl: aspeed: Use bitfield helpers
> [RFC] pinctl: ti: iodelay: Use bitfield helpers
> [RFC] regulator: ti-abb: Use bitfield helpers
> [RFC] thermal/ti-soc-thermal: Use bitfield helpers
> [RFC] ALSA: ice1724: Use bitfield helpers
> [RFC] rtw89: Use bitfield helpers
>
> arch/arm/mach-omap2/clkt2xxx_dpllcore.c | 5 +-
> arch/arm/mach-omap2/cm2xxx.c | 11 ++-
> arch/arm/mach-omap2/cm2xxx_3xxx.h | 9 +--
> arch/arm/mach-omap2/cm33xx.c | 9 +--
> arch/arm/mach-omap2/cm3xxx.c | 7 +-
> arch/arm/mach-omap2/cminst44xx.c | 9 +--
> arch/arm/mach-omap2/powerdomains3xxx_data.c | 3 +-
> arch/arm/mach-omap2/prm.h | 2 -
> arch/arm/mach-omap2/prm2xxx.c | 4 +-
> arch/arm/mach-omap2/prm2xxx_3xxx.c | 7 +-
> arch/arm/mach-omap2/prm2xxx_3xxx.h | 9 +--
> arch/arm/mach-omap2/prm33xx.c | 53 +++++-------
> arch/arm/mach-omap2/prm3xxx.c | 3 +-
> arch/arm/mach-omap2/prm44xx.c | 53 ++++--------
> arch/arm/mach-omap2/vc.c | 12 +--
> arch/arm/mach-omap2/vp.c | 11 +--
> drivers/bus/omap_l3_noc.c | 4 +-
> drivers/clk/at91/clk-peripheral.c | 1 +
> drivers/clk/at91/pmc.h | 3 -
> drivers/clk/renesas/clk-div6.c | 6 +-
> drivers/clk/renesas/r8a779a0-cpg-mssr.c | 9 +--
> drivers/clk/renesas/rcar-gen3-cpg.c | 15 ++--
> drivers/clk/ti/apll.c | 25 +++---
> drivers/clk/ti/dpll3xxx.c | 81 ++++++++-----------
> .../iio/common/st_sensors/st_sensors_core.c | 5 +-
> drivers/iio/humidity/hts221_core.c | 8 +-
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h | 1 -
> .../iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 7 +-
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 45 +++++------
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c | 11 +--
> drivers/media/platform/ti-vpe/cal.h | 4 +-
> drivers/mmc/host/sdhci-of-aspeed.c | 5 +-
> drivers/net/wireless/realtek/rtw89/core.h | 38 ++-------
> drivers/pinctrl/aspeed/pinctrl-aspeed-g4.c | 3 +-
> drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c | 3 +-
> drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c | 3 +-
> drivers/pinctrl/aspeed/pinctrl-aspeed.c | 5 +-
> drivers/pinctrl/aspeed/pinmux-aspeed.c | 6 +-
> drivers/pinctrl/ti/pinctrl-ti-iodelay.c | 35 +++-----
> drivers/regulator/ti-abb-regulator.c | 7 +-
> drivers/soc/renesas/renesas-soc.c | 4 +-
> drivers/thermal/ti-soc-thermal/ti-bandgap.c | 11 ++-
> include/linux/bitfield.h | 30 +++++++
> sound/pci/ice1712/wm8766.c | 14 ++--
> sound/pci/ice1712/wm8776.c | 14 ++--
> 45 files changed, 263 insertions(+), 347 deletions(-)
>
> --
> 2.25.1
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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