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https://bugs.gentoo.org/835646
https://github.com/openzfs/zfs/commit/7b215d93bcc0a72d7020ccc050c64f39aa7f2be8.patch
From: Ryan Moeller <freqlabs@FreeBSD.org>
Date: Thu, 17 Mar 2022 13:18:23 -0400
Subject: [PATCH] Fix module build with -Werror
This is a direct commit to zfs-2.1-release to fix release builds that
error out on an unused variable. The issue is avoided on master by a
huge series of commits that change how the ASSERT macros work, but that
is not feasible to backport.
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Ryan Moeller <freqlabs@FreeBSD.org>
Closes #13194
Closes #13196
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -1205,7 +1205,7 @@ static void
hdr_l2only_dest(void *vbuf, void *unused)
{
(void) unused;
- arc_buf_hdr_t *hdr = vbuf;
+ arc_buf_hdr_t *hdr __maybe_unused = vbuf;
ASSERT(HDR_EMPTY(hdr));
arc_space_return(HDR_L2ONLY_SIZE, ARC_SPACE_L2HDRS);
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