Bug 185581

Summary:	WARNING: func [module] has no CRC! when CONFIG_RELOCATABLE is not set
Product:	Other	Reporter:	Ivan Bulatovic (combuster)
Component:	Other	Assignee:	other_other
Status:	CLOSED CODE_FIX
Severity:	high	CC:	dex, karl.beldan, ntzrmtthihu777, rdunlap
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	4.9.0-rc1	Subsystem:
Regression:	No	Bisected commit-id:

Description Ivan Bulatovic 2016-10-29 14:27:44 UTC

Hi,

ever since commit https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=84d69848c97faab0c25aa2667b273404d2e2a64a

Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

I get warnings during build:

...
WARNING: "_copy_from_user" [drivers/md/dm-mod.ko] has no CRC!
WARNING: "___preempt_schedule" [drivers/md/dm-crypt.ko] has no CRC!
WARNING: "__sw_hweight64" [drivers/md/dm-crypt.ko] has no CRC!
WARNING: "memcpy" [drivers/md/dm-crypt.ko] has no CRC!
WARNING: "memset" [drivers/md/dm-crypt.ko] has no CRC!
WARNING: "__get_user_8" [drivers/input/serio/serport.ko] has no CRC!
WARNING: "__get_user_4" [drivers/input/serio/serport.ko] has no CRC!
WARNING: "__put_user_1" [drivers/input/serio/serio_raw.ko] has no CRC!
WARNING: "__get_user_1" [drivers/input/serio/serio_raw.ko] has no CRC!
WARNING: "__sw_hweight32" [drivers/input/serio/pcips2.ko] has no CRC!
WARNING: "_copy_to_user" [drivers/input/mousedev.ko] has no CRC!
...

Reverting the commit fixes the issue, as selecting CONFIG_RELOCATABLE in kernel config, so issue only occur if CONFIG_RELOCATABLE is not set.

This is a default setting on most distros since it's a requirement for UEFI, but saw it on LKML too:

https://lkml.org/lkml/2016/10/27/471

Commit message clearly states that it does bring a regression, but I'm not sure if it's related, hence the bug report so it could be tracked.

Regards,

Ivan

Comment 1 Daniel Exner 2016-11-07 16:16:57 UTC

I can confirm this issue even with CONFIG_RELOCATABLE set.

Comment 2 karl.beldan 2016-11-10 10:27:47 UTC

(In reply to Daniel Exner from comment #1)
> I can confirm this issue even with CONFIG_RELOCATABLE set.

+1

Comment 3 karl.beldan 2016-11-30 17:05:53 UTC

Fixed by the recent MODVERSIONS commits.

Comment 4 ntzrmtthihu777 2016-12-16 04:17:59 UTC

unless I'm missing something, I still get these errors on gentoo's sys-kernel/gentoo-sources-4.9.0, building an efistub kernel, is this going to be part of say 4.9.1 ?

Comment 5 Randy Dunlap 2018-04-08 00:28:18 UTC

Fixed 2016-NOV-29 by commit ID faaae2a581435f32781a105dda3501df388fddcb.