linux-kernel - Re: kernel/vmcore_info.c:117 paddr_vmcoreinfo_note() warn: unsigned '

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Message-ID: <Z7Brcjzuh+SG/io1@MiWiFi-R3L-srv>
Date: Sat, 15 Feb 2025 18:24:50 +0800
From: Baoquan He <bhe@...hat.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Yang Li <yang.lee@...ux.alibaba.com>
Subject: Re: kernel/vmcore_info.c:117 paddr_vmcoreinfo_note() warn: unsigned
 '_x' is never less than zero.

On 02/14/25 at 06:44pm, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   128c8f96eb8638c060cd3532dc394d046ce64fe1
> commit: 443cbaf9e2fdbef7d7cae457434a6cb8a679441b crash: split vmcoreinfo exporting code out from crash_core.c
> date:   12 months ago
> config: riscv-randconfig-r073-20250213 (https://download.01.org/0day-ci/archive/20250214/202502141843.5QoKdQ7g-lkp@intel.com/config)
> compiler: riscv32-linux-gcc (GCC) 14.2.0
> 
> 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/202502141843.5QoKdQ7g-lkp@intel.com/
> 
> smatch warnings:
> kernel/vmcore_info.c:117 paddr_vmcoreinfo_note() warn: unsigned '_x' is never less than zero.

Thanks for reporting this.

I am preparing to reproduce this issue, while I may not know what are
the steps to reproduce.  Just run smatch or just build with the provided
riscv-randconfig-r073-20250213?

> 
> vim +/_x +117 kernel/vmcore_info.c
> 
>    114	
>    115	phys_addr_t __weak paddr_vmcoreinfo_note(void)
>    116	{
>  > 117		return __pa(vmcoreinfo_note);
>    118	}
>    119	EXPORT_SYMBOL(paddr_vmcoreinfo_note);
>    120	
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>