linux-kernel - Re: net/core/page_pool.c:590:9: sparse: sparse: incorrect type in argument 1 (different address spaces)

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Date:   Mon, 20 Nov 2023 10:24:11 +0800
From:   Yujie Liu <yujie.liu@...el.com>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>
CC:     Jakub Kicinski <kuba@...nel.org>,
        kernel test robot <lkp@...el.com>,
        <oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        "Alexander Duyck" <alexanderduyck@...com>
Subject: Re: net/core/page_pool.c:590:9: sparse: sparse: incorrect type in
 argument 1 (different address spaces)

Hi Olek,

On Thu, Nov 16, 2023 at 01:06:46PM +0100, Alexander Lobakin wrote:
> From: Kernel Test Robot <lkp@...el.com>
> Date: Thu, 16 Nov 2023 03:12:24 +0800
> 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   c42d9eeef8e5ba9292eda36fd8e3c11f35ee065c
> > commit: ff4e538c8c3e675a15e1e49509c55951832e0451 page_pool: add a lockdep check for recycling in hardirq
> > date:   3 months ago
> > config: loongarch-randconfig-r133-20231107 (https://download.01.org/0day-ci/archive/20231116/202311160339.DbhaH8LX-lkp@intel.com/config)
> > compiler: loongarch64-linux-gcc (GCC) 13.2.0
> > reproduce: (https://download.01.org/0day-ci/archive/20231116/202311160339.DbhaH8LX-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/202311160339.DbhaH8LX-lkp@intel.com/
> > 
> > sparse warnings: (new ones prefixed by >>)
> >>> net/core/page_pool.c:590:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *ptr @@     got unsigned int [noderef] __percpu * @@
> >    net/core/page_pool.c:590:9: sparse:     expected void *ptr
> >    net/core/page_pool.c:590:9: sparse:     got unsigned int [noderef] __percpu *
> 
> Eeehhh... False-positive?

This is a loongarch-specific warning and should be fixed by [1].
We will configure the bot to avoid sending similar duplicate reports.

[1] https://lore.kernel.org/loongarch/20231113032511.860159-1-chenhuacai@loongson.cn/

Thanks,
Yujie