linux-kernel - Re: arch/x86/include/asm/processor.h:698:16: sparse: sparse: incorrect type in initializer (different address spaces)

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Date: Fri, 01 Mar 2024 22:57:41 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, Arjan van
 de Ven <arjan@...ux.intel.com>, x86@...nel.org
Subject: Re: arch/x86/include/asm/processor.h:698:16: sparse: sparse:
 incorrect type in initializer (different address spaces)

On Sat, Mar 02 2024 at 04:12, kernel test robot wrote:
> FYI, the error/warning was bisected to this commit, please ignore it
> if it's irrelevant.

I have no idea to which previous thread you are replying to because your
mail lacks any references.

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   87adedeba51a822533649b143232418b9e26d08b
> commit: 6e29032340b60f7aa7475c8234b17273e4424007 x86/cpu: Move cpu_l[l2]c_id into topology info
> date:   5 months ago
> config: i386-randconfig-062-20240301 (https://download.01.org/0day-ci/archive/20240302/202403020457.RCJoQ3ts-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240302/202403020457.RCJoQ3ts-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202403020457.RCJoQ3ts-lkp@intel.com/
>
> sparse warnings: (new ones prefixed by >>)
>
> vim +698 arch/x86/include/asm/processor.h
>
>    695	
>    696	static inline u16 per_cpu_llc_id(unsigned int cpu)
>    697	{
>  > 698		return per_cpu(cpu_info.topo.llc_id, cpu);
>    699	}
>    700	

This is bogus and I looked at another related bogosity today:

  https://lore.kernel.org/all/202403010704.oGQZPu0P-lkp@intel.com

which has similar complaints.

So I went and downloaded the config and followed the reproduction
instructions except for one detail.

The only difference is the sparse version:

    1) I had the regular debian variant installed.

       Version:  0.6.4 (Debian: 0.6.4-3)

    2) I updated my sparse clone and rebuilt

       Version:  v0.6.4-66-g0196afe16a50

Neither one of them exposed the problem, but you are using:

       sparse version: v0.6.4-66-g0196afe1-dirty

which is obviously based on the latest upstream tree, but seems to have
some extra muck on top which I don't know what it is.

Does this reproduce with an unpatched upstream sparse for you?

If so then I'm really curious why it does not reproduce here.

Thanks,

        tglx