From: Peter Rosin <peda@axentia.se>
To: Arnd Bergmann <arnd@kernel.org>,
linux-kernel@vger.kernel.org, Corey Minyard <minyard@acm.org>,
Peter Huewe <peterhuewe@gmx.de>,
Jarkko Sakkinen <jarkko@kernel.org>,
Vinod Koul <vkoul@kernel.org>, Moritz Fischer <mdf@kernel.org>,
Wu Hao <hao.wu@intel.com>, Xu Yilun <yilun.xu@intel.com>,
Jiri Kosina <jikos@kernel.org>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
Michael Hennerich <michael.hennerich@analog.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Iyappan Subramanian <iyappan@os.amperecomputing.com>,
Keyur Chudgar <keyur@os.amperecomputing.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Yisen Zhuang <yisen.zhuang@huawei.com>,
Salil Mehta <salil.mehta@huawei.com>,
Tony Lindgren <tony@atomide.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Xiang Chen <chenxiang66@hisilicon.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Russell King <linux@armlinux.org.uk>,
Jiri Slaby <jirislaby@kernel.org>,
Jacky Huang <ychuang3@nuvoton.com>,
Shan-Chun Hung <schung@nuvoton.com>
Cc: "Arnd Bergmann" <arnd@arndb.de>, "Jason Gunthorpe" <jgg@ziepe.ca>,
"Tom Rix" <trix@redhat.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Rob Herring" <robh@kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
openipmi-developer@lists.sourceforge.net,
linux-integrity@vger.kernel.org, dmaengine@vger.kernel.org,
linux-fpga@vger.kernel.org, linux-input@vger.kernel.org,
linux-i2c@vger.kernel.org, netdev@vger.kernel.org,
linux-omap@vger.kernel.org, linux-rtc@vger.kernel.org,
linux-scsi@vger.kernel.org, linux-staging@lists.linux.dev,
linux-serial@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 33/34] drivers: remove incorrect of_match_ptr/ACPI_PTR annotations
Date: Tue, 23 Apr 2024 11:52:52 +0200 [thread overview]
Message-ID: <3f095b5d-ced2-1c8a-9bd2-2ff2a9480fa1@axentia.se> (raw)
In-Reply-To: <20240403080702.3509288-34-arnd@kernel.org>
Hi!
2024-04-03 at 10:06, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> When building with CONFIG_OF and/or CONFIG_ACPI disabled but W=1 extra
> warnings enabled, a lot of driver cause a warning about an unused
> ID table:
>
> drivers/char/tpm/tpm_ftpm_tee.c:356:34: error: unused variable 'of_ftpm_tee_ids' [-Werror,-Wunused-const-variable]
> drivers/dma/img-mdc-dma.c:863:34: error: unused variable 'mdc_dma_of_match' [-Werror,-Wunused-const-variable]
> drivers/fpga/versal-fpga.c:62:34: error: unused variable 'versal_fpga_of_match' [-Werror,-Wunused-const-variable]
> drivers/i2c/muxes/i2c-mux-ltc4306.c:200:34: error: unused variable 'ltc4306_of_match' [-Werror,-Wunused-const-variable]
> drivers/i2c/muxes/i2c-mux-reg.c:242:34: error: unused variable 'i2c_mux_reg_of_match' [-Werror,-Wunused-const-variable]
> drivers/memory/pl353-smc.c:62:34: error: unused variable 'pl353_smc_supported_children' [-Werror,-Wunused-const-variable]
> drivers/regulator/pbias-regulator.c:136:34: error: unused variable 'pbias_of_match' [-Werror,-Wunused-const-variable]
> drivers/regulator/twl-regulator.c:552:34: error: unused variable 'twl_of_match' [-Werror,-Wunused-const-variable]
> drivers/regulator/twl6030-regulator.c:645:34: error: unused variable 'twl_of_match' [-Werror,-Wunused-const-variable]
> drivers/scsi/hisi_sas/hisi_sas_v2_hw.c:3635:36: error: unused variable 'sas_v2_acpi_match' [-Werror,-Wunused-const-variable]
> drivers/staging/pi433/pi433_if.c:1359:34: error: unused variable 'pi433_dt_ids' [-Werror,-Wunused-const-variable]
> drivers/tty/serial/amba-pl011.c:2945:34: error: unused variable 'sbsa_uart_of_match' [-Werror,-Wunused-const-variable]
>
> The fix is always to just remove the of_match_ptr() and ACPI_PTR() wrappers
> that remove the reference, rather than adding another #ifdef just for build
> testing for a configuration that doesn't matter in practice.
>
> I considered splitting up the large patch into per subsystem patches, but since
> it's really just the same thing everywhere it feels better to do it all at once.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> drivers/char/ipmi/ipmb_dev_int.c | 2 +-
> drivers/char/tpm/tpm_ftpm_tee.c | 2 +-
> drivers/dma/img-mdc-dma.c | 2 +-
> drivers/fpga/versal-fpga.c | 2 +-
> drivers/hid/hid-google-hammer.c | 6 ++----
> drivers/i2c/muxes/i2c-mux-ltc4306.c | 2 +-
> drivers/i2c/muxes/i2c-mux-reg.c | 2 +-
> drivers/input/touchscreen/wdt87xx_i2c.c | 2 +-
> drivers/mux/adg792a.c | 2 +-
> drivers/net/ethernet/apm/xgene-v2/main.c | 2 +-
> drivers/net/ethernet/hisilicon/hns_mdio.c | 2 +-
> drivers/regulator/pbias-regulator.c | 2 +-
> drivers/regulator/twl-regulator.c | 2 +-
> drivers/regulator/twl6030-regulator.c | 2 +-
> drivers/rtc/rtc-fsl-ftm-alarm.c | 2 +-
> drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 2 +-
> drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 2 +-
> drivers/staging/pi433/pi433_if.c | 2 +-
> drivers/tty/serial/amba-pl011.c | 6 +++---
> drivers/tty/serial/ma35d1_serial.c | 2 +-
> 20 files changed, 23 insertions(+), 25 deletions(-)
As far as I can tell, this triggers unconditional use of the
.of_match_table, and the compiler will have a harder time dropping
that data. However, the wasted data is negligible for the parts
touching "my" drivers:
drivers/i2c/muxes/i2c-mux-ltc4306.c
drivers/i2c/muxes/i2c-mux-reg.c
drivers/mux/adg729a.c
Acked-by: Peter Rosin <peda@axentia.se>
Cheers,
Peter
next prev parent reply other threads:[~2024-04-23 9:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-03 8:06 [PATCH 00/34] address all -Wunused-const warnings Arnd Bergmann
2024-04-03 8:06 ` [PATCH 04/34] i2c: pxa: hide unused icr_bits[] variable Arnd Bergmann
2024-04-03 23:17 ` Andi Shyti
2024-04-03 8:06 ` [PATCH 33/34] drivers: remove incorrect of_match_ptr/ACPI_PTR annotations Arnd Bergmann
2024-04-03 9:13 ` Krzysztof Kozlowski
2024-04-03 9:30 ` Andy Shevchenko
2024-04-03 12:47 ` Corey Minyard
2024-04-03 13:23 ` Andy Shevchenko
2024-04-03 12:47 ` Corey Minyard
2024-04-03 16:09 ` Jarkko Sakkinen
2024-04-09 13:48 ` Greg Kroah-Hartman
2024-04-23 7:33 ` Xu Yilun
2024-04-23 9:52 ` Peter Rosin [this message]
2024-04-06 5:20 ` [PATCH 00/34] address all -Wunused-const warnings patchwork-bot+netdevbpf
2024-04-10 8:02 ` (subset) " Sebastian Reichel
2024-04-22 8:16 ` Michael Ellerman
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