#armlinux on 2023-09-29 — irc logs at libera.irclog.whitequark.org

2021-05-27 16:22 ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux

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07:36 <ukleinek> arnd: I wonder about CONFIG_DEBUG_SECTION_MISMATCH=y + CONFIG_CORESIGHT_SOURCE_ETM4X=y not warning about etm4_platform_driver (in .data) refering to etm4_remove_platform_dev() (in .exit.text)

07:38 <ukleinek> If i remove the __exit annotation from etm4_remove_platform_dev, it catches: WARNING: modpost: vmlinux: section mismatch in reference: etm4_remove_platform_dev+0x18 (section: .text) -> etm4_remove_dev (section: .exit.text)

07:38 <ukleinek> (as expected)

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07:42 <ukleinek> looking at objdump -D drivers/hwtracing/coresight/coresight-etm4x-core.o, etm4_platform_driver doesn't reference etm4_remove_platform_dev (which explains why the section mismatch test doesn't trigger)

07:48 <ukleinek> ah, with -r the reference is there. I guess modpost (or where the debug section missmatch is implemented) just doesn't understand that

07:57 * ukleinek writes a mail

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08:17 <ukleinek> FTR: https://lore.kernel.org/linux-arm-kernel/20230929081540.yija47lsj35xtj4v@pengutronix.de

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08:37 <geertu> ukleinek: It depends on inlining

08:38 <ukleinek> geertu: I think that's not the issue

08:39 <geertu> ukleinek: Oh right, should have read everything

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15:50 <ndesaulniers> huh, I wonder if stable maintainers are testing arm64 defconfig? https://lore.kernel.org/stable/e56ced8d-d09d-469b-80df-0cc2bdd943f4@roeck-us.net/ oops!

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17:00 <arnd> ukleinek: I think this is an exception to the warning: https://elixir.bootlin.com/linux/latest/source/scripts/mod/modpost.c#L1016 ensures that a structure named *driver can reference init and exit sections, if I read this correctly

17:01 <arnd> do you get a warning if you rename the symbol

17:01 <arnd> ?

17:26 <ukleinek> arnd: ah, I remember, back then references to .devinit/.devexit were ok back then

17:26 * ukleinek looks

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19:54 <arnd> ukleinek: oh fun, so you almost fixed it 13 years ago when you sent 0db252452378 ("modpost: don't allow *driver to reference .init.*" ? ;-)

19:59 <ukleinek> arnd: oh, I really don't remember that one!

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