From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: crypto: Work around deallocated stack frame reference gcc bug
 on sparc.
Date: Fri, 02 Jun 2017 14:39:06 -0400 (EDT)
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        <20170602180808.GB5636@birch.djwong.org>
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From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Fri, 2 Jun 2017 11:08:08 -0700

> ext4/jbd2's crc32c implementations will also need a fix like this for
> {ext4,jbd2}_chksum.  Note that both of these modules call the crypto api
> directly to avoid a static dependence on libcrc32c; this was done to
> reduce kernel footprint for applications that don't need it.  (ext2,
> ext3, and ext4 before the metadata_csum feature existed).

Good catch.  I even looked at that code the other day so should
have spotted it as well.

I'll integrate fixes for those into my patch when I get a chance,
thanks!