On Thu, Aug 22, 2024 at 11:04 AM Suren Baghdasaryan [off-list ref] wrote:

On Thu, Aug 22, 2024 at 10:18 AM LEROY Christophe
[off-list ref] wrote:

quoted

Le 21/07/2024 à 01:09, Erhard Furtner a écrit :

quoted

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On Sat, 29 Jun 2024 15:31:28 +0200
Erhard Furtner [off-list ref] wrote:

quoted

I get a build failure on v6.10-rc5 on my Talos II when MEM_ALLOC_PROFILING=y is enabled:

[...]
   LD [M]  fs/xfs/xfs.o
   LD [M]  fs/bcachefs/bcachefs.o
   AR      built-in.a
   AR      vmlinux.a
   LD      vmlinux.o
   OBJCOPY modules.builtin.modinfo
   GEN     modules.builtin
   GEN     .vmlinux.objs
   MODPOST Module.symvers
ERROR: modpost: "page_ext_get" [arch/powerpc/kvm/kvm-hv.ko] undefined!
ERROR: modpost: "mem_alloc_profiling_key" [arch/powerpc/kvm/kvm-hv.ko] undefined!
ERROR: modpost: "page_ext_put" [arch/powerpc/kvm/kvm-hv.ko] undefined!
make[2]: *** [scripts/Makefile.modpost:145: Module.symvers] Fehler 1
make[1]: *** [/usr/src/linux-stable/Makefile:1886: modpost] Fehler 2
make: *** [Makefile:240: __sub-make] Fehler 2

Same .config builds fine without MEM_ALLOC_PROFILING set. Kernel .config attached.

Build problem still there on now released v6.10 with MEM_ALLOC_PROFILING=y.

Can't bisect as build with MEM_ALLOC_PROFILING fails since it's introduction in v6.10-rc1.

I guess those three functions are missing EXPORT_SYMBOL_GPL() tagging.

The issue should have been fixed by
https://lore.kernel.org/all/20240717181239.2510054-1-surenb@google.com/ (local)
patchset. I probably forgot to CC stable@ for these changes. Let me
check and follow up.

The issue is fixed by the patch titled "alloc_tag: outline and export
free_reserved_page()" which has b3bebe44306e SHA in Linus' tree and
first appears in v6.10.3 with SHA 4a9a52b70cce.

Thanks,
Suren.

quoted

Christophe