On Sun, May 22, 2022 at 8:50 AM Masahiro Yamada [off-list ref] wrote:

On Sun, May 22, 2022 at 10:45 AM Sedat Dilek [off-list ref] wrote:

quoted

On Fri, May 13, 2022 at 4:31 PM Masahiro Yamada [off-list ref] wrote:

quoted

On Fri, May 13, 2022 at 8:42 PM Masahiro Yamada [off-list ref] wrote:

quoted

This is the third batch of cleanups in this development cycle.

This series is available at
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
 lto-cleanup-v6

Hi Masahiro,

I cloned the repository on top of latest Linus Git.

Not able to boot in Quemu - Not able to boot on bare metal.

$ grep module_layout log_quemu-5.18.0-rc7-2-amd64-clang14-lto.txt
366:[    2.173265] floppy: disagrees about version of symbol module_layout
367:[    2.198746] scsi_common: disagrees about version of symbol module_layout
368:[    2.205573] i2c_piix4: disagrees about version of symbol module_layout
369:[    2.210610] psmouse: disagrees about version of symbol module_layout
370:[    2.225138] scsi_common: disagrees about version of symbol module_layout
371:[    2.235536] scsi_common: disagrees about version of symbol module_layout
375:Begin: Running /scripts/local-premount ... [    2.298555]
crc32c_intel: disagrees about version of symbol module_layout
376:[    2.303335] crc32c_generic: disagrees about version of symbol
module_layout
377:[    2.306667] libcrc32c: disagrees about version of symbol module_layout

Infos: LLVM-14 + CONFIG_LTO_CLANG_THIN=y

My linux-config and qemu-log are attached.

Thanks for your testing.

I was also able to reproduce this issue.


The problematic parts are:

[    2.298555] crc32c_intel: disagrees about version of symbol module_layout
[    2.303335] crc32c_generic: disagrees about version of symbol module_layout
[    2.306667] libcrc32c: disagrees about version of symbol module_layout



When CONFIG_LTO_CLANG_THIN=y,
I cannot see any __crc_* symbols in "nm  vmlinux".

Perhaps, LTO might have discarded all the __crc_* symbols
from vmlinux, but I am still checking the details...

Thanks for taking care.

Just for the records:

$ grep CONFIG_MODVERSIONS /boot/config-5.18.0-rc7-2-amd64-clang14-lto
CONFIG_MODVERSIONS=y

-Sedat-