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Date: Wed, 23 Nov 2022 22:11:49 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Alexander Lobakin <alobakin@...me>
Cc: linux-kbuild@...r.kernel.org, Nicolas Schier <nicolas@...sle.eu>,
Jens Axboe <axboe@...nel.dk>,
Boris Brezillon <bbrezillon@...nel.org>,
Borislav Petkov <bp@...en8.de>,
Tony Luck <tony.luck@...el.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Vladimir Oltean <vladimir.oltean@....com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Derek Chickles <dchickles@...vell.com>,
Ioana Ciornei <ioana.ciornei@....com>,
Salil Mehta <salil.mehta@...wei.com>,
Sunil Goutham <sgoutham@...vell.com>,
Grygorii Strashko <grygorii.strashko@...com>,
Daniel Scally <djrscally@...il.com>,
Hans de Goede <hdegoede@...hat.com>,
Mark Brown <broonie@...nel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
NXP Linux Team <linux-imx@....com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/18] mtd: tests: fix object shared between several modules
On Sun, Nov 20, 2022 at 8:08 AM Alexander Lobakin <alobakin@...me> wrote:
>
> mtd_test.o is linked to 8(!) different test modules:
>
> > scripts/Makefile.build:252: ./drivers/mtd/tests/Makefile: mtd_test.o
> > is added to multiple modules: mtd_nandbiterrs mtd_oobtest mtd_pagetest
> > mtd_readtest mtd_speedtest mtd_stresstest mtd_subpagetest mtd_torturetest
>
> Although all of them share one Kconfig option
> (CONFIG_MTD_TESTS), it's better to not link one object file into
> several modules (and/or vmlinux).
> Under certain circumstances, such can lead to the situation fixed by
> commit 637a642f5ca5 ("zstd: Fixing mixed module-builtin objects").
> In this particular case, there's also no need to duplicate the very
> same object code 8 times.
>
> Convert mtd_test.o to a standalone module which will export its
> functions to the rest.
>
> Fixes: a995c792280d ("mtd: tests: rename sources in order to link a helper object")
> Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
IMHO, Reported-by might be a better fit.
I think they can become static inline functions in mtd_test.h
(at least, mtdtest_relax() is a static inline there), but I am not sure.
Please send this to the MTD list, and consult the maintainer(s).
> Signed-off-by: Alexander Lobakin <alobakin@...me>
> ---
> drivers/mtd/tests/Makefile | 17 +++++++++--------
> drivers/mtd/tests/mtd_test.c | 9 +++++++++
> drivers/mtd/tests/nandbiterrs.c | 2 ++
> drivers/mtd/tests/oobtest.c | 2 ++
> drivers/mtd/tests/pagetest.c | 2 ++
> drivers/mtd/tests/readtest.c | 2 ++
> drivers/mtd/tests/speedtest.c | 2 ++
> drivers/mtd/tests/stresstest.c | 2 ++
> drivers/mtd/tests/subpagetest.c | 2 ++
> drivers/mtd/tests/torturetest.c | 2 ++
> 10 files changed, 34 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mtd/tests/Makefile b/drivers/mtd/tests/Makefile
> index 5de0378f90db..e3f86ed123ca 100644
> --- a/drivers/mtd/tests/Makefile
> +++ b/drivers/mtd/tests/Makefile
> @@ -1,4 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_MTD_TESTS) += mtd_test.o
> obj-$(CONFIG_MTD_TESTS) += mtd_oobtest.o
> obj-$(CONFIG_MTD_TESTS) += mtd_pagetest.o
> obj-$(CONFIG_MTD_TESTS) += mtd_readtest.o
> @@ -9,11 +10,11 @@ obj-$(CONFIG_MTD_TESTS) += mtd_torturetest.o
> obj-$(CONFIG_MTD_TESTS) += mtd_nandecctest.o
> obj-$(CONFIG_MTD_TESTS) += mtd_nandbiterrs.o
>
> -mtd_oobtest-objs := oobtest.o mtd_test.o
> -mtd_pagetest-objs := pagetest.o mtd_test.o
> -mtd_readtest-objs := readtest.o mtd_test.o
> -mtd_speedtest-objs := speedtest.o mtd_test.o
> -mtd_stresstest-objs := stresstest.o mtd_test.o
> -mtd_subpagetest-objs := subpagetest.o mtd_test.o
> -mtd_torturetest-objs := torturetest.o mtd_test.o
> -mtd_nandbiterrs-objs := nandbiterrs.o mtd_test.o
> +mtd_oobtest-objs := oobtest.o
> +mtd_pagetest-objs := pagetest.o
> +mtd_readtest-objs := readtest.o
> +mtd_speedtest-objs := speedtest.o
> +mtd_stresstest-objs := stresstest.o
> +mtd_subpagetest-objs := subpagetest.o
> +mtd_torturetest-objs := torturetest.o
> +mtd_nandbiterrs-objs := nandbiterrs.o
> diff --git a/drivers/mtd/tests/mtd_test.c b/drivers/mtd/tests/mtd_test.c
> index c84250beffdc..93920a714315 100644
> --- a/drivers/mtd/tests/mtd_test.c
> +++ b/drivers/mtd/tests/mtd_test.c
> @@ -25,6 +25,7 @@ int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum)
>
> return 0;
> }
> +EXPORT_SYMBOL_NS_GPL(mtdtest_erase_eraseblock, MTD_TESTS);
>
> static int is_block_bad(struct mtd_info *mtd, unsigned int ebnum)
> {
> @@ -57,6 +58,7 @@ int mtdtest_scan_for_bad_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
>
> return 0;
> }
> +EXPORT_SYMBOL_NS_GPL(mtdtest_scan_for_bad_eraseblocks, MTD_TESTS);
>
> int mtdtest_erase_good_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
> unsigned int eb, int ebcnt)
> @@ -75,6 +77,7 @@ int mtdtest_erase_good_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
>
> return 0;
> }
> +EXPORT_SYMBOL_NS_GPL(mtdtest_erase_good_eraseblocks, MTD_TESTS);
>
> int mtdtest_read(struct mtd_info *mtd, loff_t addr, size_t size, void *buf)
> {
> @@ -92,6 +95,7 @@ int mtdtest_read(struct mtd_info *mtd, loff_t addr, size_t size, void *buf)
>
> return err;
> }
> +EXPORT_SYMBOL_NS_GPL(mtdtest_read, MTD_TESTS);
>
> int mtdtest_write(struct mtd_info *mtd, loff_t addr, size_t size,
> const void *buf)
> @@ -107,3 +111,8 @@ int mtdtest_write(struct mtd_info *mtd, loff_t addr, size_t size,
>
> return err;
> }
> +EXPORT_SYMBOL_NS_GPL(mtdtest_write, MTD_TESTS);
> +
> +MODULE_DESCRIPTION("MTD test common module");
> +MODULE_AUTHOR("Adrian Hunter");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/nandbiterrs.c b/drivers/mtd/tests/nandbiterrs.c
> index 98d7508f95b1..acf44edfca53 100644
> --- a/drivers/mtd/tests/nandbiterrs.c
> +++ b/drivers/mtd/tests/nandbiterrs.c
> @@ -414,6 +414,8 @@ static void __exit mtd_nandbiterrs_exit(void)
> module_init(mtd_nandbiterrs_init);
> module_exit(mtd_nandbiterrs_exit);
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("NAND bit error recovery test");
> MODULE_AUTHOR("Iwo Mergler");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c
> index 13fed398937e..da4efcdd59b2 100644
> --- a/drivers/mtd/tests/oobtest.c
> +++ b/drivers/mtd/tests/oobtest.c
> @@ -728,6 +728,8 @@ static void __exit mtd_oobtest_exit(void)
> }
> module_exit(mtd_oobtest_exit);
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("Out-of-band test module");
> MODULE_AUTHOR("Adrian Hunter");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/pagetest.c b/drivers/mtd/tests/pagetest.c
> index 8eb40b6e6dfa..ac2bcc76b402 100644
> --- a/drivers/mtd/tests/pagetest.c
> +++ b/drivers/mtd/tests/pagetest.c
> @@ -456,6 +456,8 @@ static void __exit mtd_pagetest_exit(void)
> }
> module_exit(mtd_pagetest_exit);
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("NAND page test");
> MODULE_AUTHOR("Adrian Hunter");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/readtest.c b/drivers/mtd/tests/readtest.c
> index 99670ef91f2b..7e01dbc1e8ca 100644
> --- a/drivers/mtd/tests/readtest.c
> +++ b/drivers/mtd/tests/readtest.c
> @@ -210,6 +210,8 @@ static void __exit mtd_readtest_exit(void)
> }
> module_exit(mtd_readtest_exit);
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("Read test module");
> MODULE_AUTHOR("Adrian Hunter");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/speedtest.c b/drivers/mtd/tests/speedtest.c
> index 075bce32caa5..58f3701d65f2 100644
> --- a/drivers/mtd/tests/speedtest.c
> +++ b/drivers/mtd/tests/speedtest.c
> @@ -413,6 +413,8 @@ static void __exit mtd_speedtest_exit(void)
> }
> module_exit(mtd_speedtest_exit);
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("Speed test module");
> MODULE_AUTHOR("Adrian Hunter");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/stresstest.c b/drivers/mtd/tests/stresstest.c
> index 75b6ddc5dc4d..341d7cc86d89 100644
> --- a/drivers/mtd/tests/stresstest.c
> +++ b/drivers/mtd/tests/stresstest.c
> @@ -227,6 +227,8 @@ static void __exit mtd_stresstest_exit(void)
> }
> module_exit(mtd_stresstest_exit);
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("Stress test module");
> MODULE_AUTHOR("Adrian Hunter");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/subpagetest.c b/drivers/mtd/tests/subpagetest.c
> index 05250a080139..87ee2a5c518a 100644
> --- a/drivers/mtd/tests/subpagetest.c
> +++ b/drivers/mtd/tests/subpagetest.c
> @@ -432,6 +432,8 @@ static void __exit mtd_subpagetest_exit(void)
> }
> module_exit(mtd_subpagetest_exit);
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("Subpage test module");
> MODULE_AUTHOR("Adrian Hunter");
> MODULE_LICENSE("GPL");
> diff --git a/drivers/mtd/tests/torturetest.c b/drivers/mtd/tests/torturetest.c
> index 841689b4d86d..2de770f18724 100644
> --- a/drivers/mtd/tests/torturetest.c
> +++ b/drivers/mtd/tests/torturetest.c
> @@ -475,6 +475,8 @@ static int countdiffs(unsigned char *buf, unsigned char *check_buf,
> return first;
> }
>
> +MODULE_IMPORT_NS(MTD_TESTS);
> +
> MODULE_DESCRIPTION("Eraseblock torturing module");
> MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
> MODULE_LICENSE("GPL");
> --
> 2.38.1
>
>
--
Best Regards
Masahiro Yamada
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