linux-kernel - Re: [PATCH] squashfs: Fix incorrect argument to sizeof in kmalloc

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Message-ID: <14040edb-5c27-42d2-a78b-f679bbc90ed8@wanadoo.fr>
Date: Wed, 9 Jul 2025 19:03:52 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Andrew Morton <akpm@...ux-foundation.org>,
 kernel test robot <lkp@...el.com>
Cc: Colin Ian King <colin.i.king@...il.com>,
 Phillip Lougher <phillip@...ashfs.org.uk>, Chanho Min <chanho.min@....com>,
 oe-kbuild-all@...ts.linux.dev, kernel-janitors@...r.kernel.org,
 Linux Memory Management List <linux-mm@...ck.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] squashfs: Fix incorrect argument to sizeof in
 kmalloc_array call

Le 09/07/2025 à 04:54, Andrew Morton a écrit :
> On Wed, 9 Jul 2025 09:05:25 +0800 kernel test robot <lkp@...el.com> wrote:
> 
>> Hi Colin,
>>
>> kernel test robot noticed the following build errors:
>>
>> [auto build test ERROR on akpm-mm/mm-everything]
>> [also build test ERROR on next-20250708]
>> [cannot apply to linus/master v6.16-rc5]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use '--base' as documented in
>> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>>
>> url:    https://github.com/intel-lab-lkp/linux/commits/Colin-Ian-King/squashfs-Fix-incorrect-argument-to-sizeof-in-kmalloc_array-call/20250708-223017
>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
>> patch link:    https://lore.kernel.org/r/20250708142604.1891156-1-colin.i.king%40gmail.com
>> patch subject: [PATCH] squashfs: Fix incorrect argument to sizeof in kmalloc_array call
>> :::::: branch date: 10 hours ago
>> :::::: commit date: 10 hours ago
>> config: mips-randconfig-r071-20250709 (attached as .config)
>> compiler: mips64-linux-gcc (GCC) 8.5.0
>> reproduce (this is a W=1 build): (attached as 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/202507090822.QI1bMiUV-lkp@intel.com/
>>
>> All error/warnings (new ones prefixed by >>):
>>
>>     In file included from include/linux/percpu.h:5,
>>                      from include/linux/percpu_counter.h:14,
>>                      from include/linux/mm_types.h:21,
>>                      from include/linux/mmzone.h:22,
>>                      from include/linux/gfp.h:7,
>>                      from include/linux/xarray.h:16,
>>                      from include/linux/list_lru.h:14,
>>                      from include/linux/fs.h:14,
>>                      from include/linux/highmem.h:5,
>>                      from include/linux/bvec.h:10,
>>                      from include/linux/blk_types.h:10,
>>                      from include/linux/blkdev.h:9,
>>                      from fs/squashfs/block.c:16:
>>     fs/squashfs/block.c: In function 'squashfs_bio_read_cached':
>>>> fs/squashfs/block.c:92:12: error: 'folio' undeclared (first use in this function)
>>         sizeof(*folio), GFP_KERNEL | __GFP_ZERO);
>>                 ^~~~~
> 
> I made it
> 
> 	struct folio **cache_folios = kmalloc_array(page_count,
> 			sizeof(*cache_folios), GFP_KERNEL | __GFP_ZERO);
> 

WHy not kcalloc(), to be less verbose and remove the explicit __GFP_ZERO?

CJ

> 
>