linux-ext4 - Re: [PATCH v11 19/25] erofs: Convert compressed files from readpages to readahead

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Date:   Mon, 20 Apr 2020 22:42:10 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-xfs@...r.kernel.org,
        Gao Xiang <gaoxiang25@...wei.com>,
        Dave Chinner <dchinner@...hat.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Chao Yu <yuchao0@...wei.com>
Subject: Re: [PATCH v11 19/25] erofs: Convert compressed files from
 readpages to readahead

On Tue, 14 Apr 2020 08:02:27 -0700 Matthew Wilcox <willy@...radead.org> wrote:

> 
> Use the new readahead operation in erofs.
> 

Well this is exciting.

fs/erofs/data.c: In function erofs_raw_access_readahead:
fs/erofs/data.c:149:18: warning: last_block may be used uninitialized in this function [-Wmaybe-uninitialized]
	*last_block + 1 != current_block) {

It seems to be a preexisting bug, which your patch prompted gcc-7.2.0
to notice.

erofs_read_raw_page() goes in and uses *last_block, but neither of its
callers has initialized it.  Could the erofs maintainers please take a
look?