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Message-ID: <202007250324.EFnJiyqU%lkp@intel.com>
Date: Sat, 25 Jul 2020 03:24:14 +0800
From: kernel test robot <lkp@...el.com>
To: Chao Yu <yuchao0@...wei.com>, Chao Yu <chao@...nel.org>,
jaegeuk@...nel.org
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, chao@...nel.org,
Chao Yu <yuchao0@...wei.com>
Subject: Re: [PATCH 2/2] f2fs: compress: delay temp page allocation
Hi Chao,
I love your patch! Perhaps something to improve:
[auto build test WARNING on f2fs/dev-test]
[also build test WARNING on linux/master linus/master v5.8-rc6 next-20200724]
[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]
url: https://github.com/0day-ci/linux/commits/Chao-Yu/f2fs-compress-fix-to-update-isize-when-overwriting-compressed-file/20200724-182420
base: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev-test
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1d09ecf36175f7910ffedd6d497c07b5c74c22fb)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> fs/f2fs/compress.c:704:7: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!dic->tpages[i])
^~~~~~~~~~~~~~~
fs/f2fs/compress.c:751:19: note: uninitialized use occurs here
dic->clen, ret);
^~~
fs/f2fs/compress.c:704:3: note: remove the 'if' if its condition is always false
if (!dic->tpages[i])
^~~~~~~~~~~~~~~~~~~~
fs/f2fs/compress.c:694:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!dic->tpages)
^~~~~~~~~~~~
fs/f2fs/compress.c:751:19: note: uninitialized use occurs here
dic->clen, ret);
^~~
fs/f2fs/compress.c:694:2: note: remove the 'if' if its condition is always false
if (!dic->tpages)
^~~~~~~~~~~~~~~~~
fs/f2fs/compress.c:672:9: note: initialize the variable 'ret' to silence this warning
int ret;
^
= 0
2 warnings generated.
vim +704 fs/f2fs/compress.c
663
664 void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
665 {
666 struct decompress_io_ctx *dic =
667 (struct decompress_io_ctx *)page_private(page);
668 struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
669 struct f2fs_inode_info *fi= F2FS_I(dic->inode);
670 const struct f2fs_compress_ops *cops =
671 f2fs_cops[fi->i_compress_algorithm];
672 int ret;
673 int i;
674
675 dec_page_count(sbi, F2FS_RD_DATA);
676
677 if (bio->bi_status || PageError(page))
678 dic->failed = true;
679
680 if (refcount_dec_not_one(&dic->ref))
681 return;
682
683 trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
684 dic->cluster_size, fi->i_compress_algorithm);
685
686 /* submit partial compressed pages */
687 if (dic->failed) {
688 ret = -EIO;
689 goto out_free_dic;
690 }
691
692 dic->tpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
693 dic->cluster_size, GFP_NOFS);
694 if (!dic->tpages)
695 goto out_free_dic;
696
697 for (i = 0; i < dic->cluster_size; i++) {
698 if (dic->rpages[i]) {
699 dic->tpages[i] = dic->rpages[i];
700 continue;
701 }
702
703 dic->tpages[i] = f2fs_compress_alloc_page();
> 704 if (!dic->tpages[i])
705 goto out_free_dic;
706 }
707
708 if (cops->init_decompress_ctx) {
709 ret = cops->init_decompress_ctx(dic);
710 if (ret)
711 goto out_free_dic;
712 }
713
714 dic->rbuf = vmap(dic->tpages, dic->cluster_size, VM_MAP, PAGE_KERNEL);
715 if (!dic->rbuf) {
716 ret = -ENOMEM;
717 goto destroy_decompress_ctx;
718 }
719
720 dic->cbuf = vmap(dic->cpages, dic->nr_cpages, VM_MAP, PAGE_KERNEL_RO);
721 if (!dic->cbuf) {
722 ret = -ENOMEM;
723 goto out_vunmap_rbuf;
724 }
725
726 dic->clen = le32_to_cpu(dic->cbuf->clen);
727 dic->rlen = PAGE_SIZE << dic->log_cluster_size;
728
729 if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
730 ret = -EFSCORRUPTED;
731 goto out_vunmap_cbuf;
732 }
733
734 ret = cops->decompress_pages(dic);
735
736 out_vunmap_cbuf:
737 vunmap(dic->cbuf);
738 out_vunmap_rbuf:
739 vunmap(dic->rbuf);
740 destroy_decompress_ctx:
741 if (cops->destroy_decompress_ctx)
742 cops->destroy_decompress_ctx(dic);
743 out_free_dic:
744 if (verity)
745 refcount_set(&dic->ref, dic->nr_cpages);
746 if (!verity)
747 f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
748 ret, false);
749
750 trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
751 dic->clen, ret);
752 if (!verity)
753 f2fs_free_dic(dic);
754 }
755
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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