Re: Kernel build failure with MEM_ALLOC_PROFILING=y set (Talos II, v6.10-rc5)

[LEROY Christophe <christophe.leroy2@cs-soprasteria.com>]

Le 21/07/2024 à 01:09, Erhard Furtner a écrit :
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> 
> On Sat, 29 Jun 2024 15:31:28 +0200
> Erhard Furtner <erhard_f@mailbox.org> wrote:
> 
>> 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.

Christophe