linux-kernel - Re: WARNING: modpost: "cmpxchg8b_emu" [lib/test

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Date: Mon, 18 Mar 2024 15:25:22 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "kernel test robot" <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 "Borislav Petkov" <bp@...en8.de>
Subject: Re: WARNING: modpost: "cmpxchg8b_emu" [lib/test_lockup.ko] has no CRC!

On Mon, Mar 18, 2024, at 14:27, kernel test robot wrote:
> tree:   
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
> master
> head:   f6cef5f8c37f58a3bc95b3754c3ae98e086631ca
> commit: 88a2b4edda3d0709727be53f4423b0b832d91de3 x86/Kconfig: Rework 
> CONFIG_X86_PAE dependency
> date:   3 months ago
> config: um-randconfig-r035-20230726 

> WARNING: modpost: EXPORT symbol "cmpxchg8b_emu" [vmlinux] version 
> generation failed, symbol will not be versioned.
> Is "cmpxchg8b_emu" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: EXPORT symbol "csum_partial" [vmlinux] version 
> generation failed, symbol will not be versioned.
> Is "csum_partial" prototyped in <asm/asm-prototypes.h>?
> WARNING: modpost: EXPORT symbol "csum_partial_copy_generic" [vmlinux] 
> version generation failed, symbol will not be versioned.
> Is "csum_partial_copy_generic" prototyped in <asm/asm-prototypes.h>?
>>> WARNING: modpost: "cmpxchg8b_emu" [lib/test_lockup.ko] has no CRC!
>>> WARNING: modpost: "cmpxchg8b_emu" [lib/atomic64_test.ko] has no CRC!

I have not tested arch/um randconfig builds, but my guess is that
this was not actually introduced by my patch but rather lkp bisected
this into my commit because that changed the config in a way that
hides the preexisting bug on older kernels.

      Arnd