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Message-ID: <aG3AVf8fbqHzk+OD@rli9-mobl>
Date: Wed, 9 Jul 2025 09:05:25 +0800
From: kernel test robot <lkp@...el.com>
To: Colin Ian King <colin.i.king@...il.com>, Phillip Lougher
<phillip@...ashfs.org.uk>, Chanho Min <chanho.min@....com>
CC: <oe-kbuild-all@...ts.linux.dev>, <kernel-janitors@...r.kernel.org>,
"Andrew Morton" <akpm@...ux-foundation.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
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);
^~~~~
include/linux/alloc_tag.h:239:9: note: in definition of macro 'alloc_hooks_tag'
typeof(_do_alloc) _res; \
^~~~~~~~~
include/linux/slab.h:950:30: note: in expansion of macro 'alloc_hooks'
#define kmalloc_array(...) alloc_hooks(kmalloc_array_noprof(__VA_ARGS__))
^~~~~~~~~~~
fs/squashfs/block.c:91:32: note: in expansion of macro 'kmalloc_array'
struct folio **cache_folios = kmalloc_array(page_count,
^~~~~~~~~~~~~
fs/squashfs/block.c:92:12: note: each undeclared identifier is reported only once for each function it appears in
sizeof(*folio), GFP_KERNEL | __GFP_ZERO);
^~~~~
include/linux/alloc_tag.h:239:9: note: in definition of macro 'alloc_hooks_tag'
typeof(_do_alloc) _res; \
^~~~~~~~~
include/linux/slab.h:950:30: note: in expansion of macro 'alloc_hooks'
#define kmalloc_array(...) alloc_hooks(kmalloc_array_noprof(__VA_ARGS__))
^~~~~~~~~~~
fs/squashfs/block.c:91:32: note: in expansion of macro 'kmalloc_array'
struct folio **cache_folios = kmalloc_array(page_count,
^~~~~~~~~~~~~
>> include/linux/alloc_tag.h:251:1: warning: initialization of 'struct folio **' from 'int' makes pointer from integer without a cast [-Wint-conversion]
({ \
^
include/linux/slab.h:950:30: note: in expansion of macro 'alloc_hooks'
#define kmalloc_array(...) alloc_hooks(kmalloc_array_noprof(__VA_ARGS__))
^~~~~~~~~~~
fs/squashfs/block.c:91:32: note: in expansion of macro 'kmalloc_array'
struct folio **cache_folios = kmalloc_array(page_count,
^~~~~~~~~~~~~
--
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 block.c:16:
block.c: In function 'squashfs_bio_read_cached':
block.c:92:12: error: 'folio' undeclared (first use in this function)
sizeof(*folio), GFP_KERNEL | __GFP_ZERO);
^~~~~
include/linux/alloc_tag.h:239:9: note: in definition of macro 'alloc_hooks_tag'
typeof(_do_alloc) _res; \
^~~~~~~~~
include/linux/slab.h:950:30: note: in expansion of macro 'alloc_hooks'
#define kmalloc_array(...) alloc_hooks(kmalloc_array_noprof(__VA_ARGS__))
^~~~~~~~~~~
block.c:91:32: note: in expansion of macro 'kmalloc_array'
struct folio **cache_folios = kmalloc_array(page_count,
^~~~~~~~~~~~~
block.c:92:12: note: each undeclared identifier is reported only once for each function it appears in
sizeof(*folio), GFP_KERNEL | __GFP_ZERO);
^~~~~
include/linux/alloc_tag.h:239:9: note: in definition of macro 'alloc_hooks_tag'
typeof(_do_alloc) _res; \
^~~~~~~~~
include/linux/slab.h:950:30: note: in expansion of macro 'alloc_hooks'
#define kmalloc_array(...) alloc_hooks(kmalloc_array_noprof(__VA_ARGS__))
^~~~~~~~~~~
block.c:91:32: note: in expansion of macro 'kmalloc_array'
struct folio **cache_folios = kmalloc_array(page_count,
^~~~~~~~~~~~~
>> include/linux/alloc_tag.h:251:1: warning: initialization of 'struct folio **' from 'int' makes pointer from integer without a cast [-Wint-conversion]
({ \
^
include/linux/slab.h:950:30: note: in expansion of macro 'alloc_hooks'
#define kmalloc_array(...) alloc_hooks(kmalloc_array_noprof(__VA_ARGS__))
^~~~~~~~~~~
block.c:91:32: note: in expansion of macro 'kmalloc_array'
struct folio **cache_folios = kmalloc_array(page_count,
^~~~~~~~~~~~~
vim +/folio +92 fs/squashfs/block.c
93e72b3c612adc Philippe Liard 2020-06-01 78
e994f5b677ee01 Vincent Whitchurch 2023-05-17 79 static int squashfs_bio_read_cached(struct bio *fullbio,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 80 struct address_space *cache_mapping, u64 index, int length,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 81 u64 read_start, u64 read_end, int page_count)
e994f5b677ee01 Vincent Whitchurch 2023-05-17 82 {
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 83) struct folio *head_to_cache = NULL, *tail_to_cache = NULL;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 84 struct block_device *bdev = fullbio->bi_bdev;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 85 int start_idx = 0, end_idx = 0;
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 86) struct folio_iter fi;;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 87 struct bio *bio = NULL;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 88 int idx = 0;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 89 int err = 0;
2e227ff5e2729b Chanho Min 2025-05-21 90 #ifdef CONFIG_SQUASHFS_COMP_CACHE_FULL
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 91) struct folio **cache_folios = kmalloc_array(page_count,
45eb6ae283427f Colin Ian King 2025-07-08 @92 sizeof(*folio), GFP_KERNEL | __GFP_ZERO);
2e227ff5e2729b Chanho Min 2025-05-21 93 #endif
e994f5b677ee01 Vincent Whitchurch 2023-05-17 94
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 95) bio_for_each_folio_all(fi, fullbio) {
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 96) struct folio *folio = fi.folio;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 97
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 98) if (folio->mapping == cache_mapping) {
e994f5b677ee01 Vincent Whitchurch 2023-05-17 99 idx++;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 100 continue;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 101 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 102
e994f5b677ee01 Vincent Whitchurch 2023-05-17 103 /*
e994f5b677ee01 Vincent Whitchurch 2023-05-17 104 * We only use this when the device block size is the same as
e994f5b677ee01 Vincent Whitchurch 2023-05-17 105 * the page size, so read_start and read_end cover full pages.
e994f5b677ee01 Vincent Whitchurch 2023-05-17 106 *
e994f5b677ee01 Vincent Whitchurch 2023-05-17 107 * Compare these to the original required index and length to
e994f5b677ee01 Vincent Whitchurch 2023-05-17 108 * only cache pages which were requested partially, since these
e994f5b677ee01 Vincent Whitchurch 2023-05-17 109 * are the ones which are likely to be needed when reading
e994f5b677ee01 Vincent Whitchurch 2023-05-17 110 * adjacent blocks.
e994f5b677ee01 Vincent Whitchurch 2023-05-17 111 */
e994f5b677ee01 Vincent Whitchurch 2023-05-17 112 if (idx == 0 && index != read_start)
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 113) head_to_cache = folio;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 114 else if (idx == page_count - 1 && index + length != read_end)
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 115) tail_to_cache = folio;
2e227ff5e2729b Chanho Min 2025-05-21 116 #ifdef CONFIG_SQUASHFS_COMP_CACHE_FULL
2e227ff5e2729b Chanho Min 2025-05-21 117 /* Cache all pages in the BIO for repeated reads */
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 118) else if (cache_folios)
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 119) cache_folios[idx] = folio;
2e227ff5e2729b Chanho Min 2025-05-21 120 #endif
e994f5b677ee01 Vincent Whitchurch 2023-05-17 121
e994f5b677ee01 Vincent Whitchurch 2023-05-17 122 if (!bio || idx != end_idx) {
e994f5b677ee01 Vincent Whitchurch 2023-05-17 123 struct bio *new = bio_alloc_clone(bdev, fullbio,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 124 GFP_NOIO, &fs_bio_set);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 125
e994f5b677ee01 Vincent Whitchurch 2023-05-17 126 if (bio) {
e994f5b677ee01 Vincent Whitchurch 2023-05-17 127 bio_trim(bio, start_idx * PAGE_SECTORS,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 128 (end_idx - start_idx) * PAGE_SECTORS);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 129 bio_chain(bio, new);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 130 submit_bio(bio);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 131 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 132
e994f5b677ee01 Vincent Whitchurch 2023-05-17 133 bio = new;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 134 start_idx = idx;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 135 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 136
e994f5b677ee01 Vincent Whitchurch 2023-05-17 137 idx++;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 138 end_idx = idx;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 139 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 140
e994f5b677ee01 Vincent Whitchurch 2023-05-17 141 if (bio) {
e994f5b677ee01 Vincent Whitchurch 2023-05-17 142 bio_trim(bio, start_idx * PAGE_SECTORS,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 143 (end_idx - start_idx) * PAGE_SECTORS);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 144 err = submit_bio_wait(bio);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 145 bio_put(bio);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 146 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 147
e994f5b677ee01 Vincent Whitchurch 2023-05-17 148 if (err)
e994f5b677ee01 Vincent Whitchurch 2023-05-17 149 return err;
e994f5b677ee01 Vincent Whitchurch 2023-05-17 150
e994f5b677ee01 Vincent Whitchurch 2023-05-17 151 if (head_to_cache) {
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 152) int ret = filemap_add_folio(cache_mapping, head_to_cache,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 153 read_start >> PAGE_SHIFT,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 154 GFP_NOIO);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 155
e994f5b677ee01 Vincent Whitchurch 2023-05-17 156 if (!ret) {
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 157) folio_mark_uptodate(head_to_cache);
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 158) folio_unlock(head_to_cache);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 159 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 160
e994f5b677ee01 Vincent Whitchurch 2023-05-17 161 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 162
e994f5b677ee01 Vincent Whitchurch 2023-05-17 163 if (tail_to_cache) {
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 164) int ret = filemap_add_folio(cache_mapping, tail_to_cache,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 165 (read_end >> PAGE_SHIFT) - 1,
e994f5b677ee01 Vincent Whitchurch 2023-05-17 166 GFP_NOIO);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 167
e994f5b677ee01 Vincent Whitchurch 2023-05-17 168 if (!ret) {
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 169) folio_mark_uptodate(tail_to_cache);
193770db0106b0 Matthew Wilcox (Oracle 2025-06-12 170) folio_unlock(tail_to_cache);
e994f5b677ee01 Vincent Whitchurch 2023-05-17 171 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 172 }
e994f5b677ee01 Vincent Whitchurch 2023-05-17 173
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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