From: Arnd Bergmann <arnd@arndb.de>
To: Oleg Drokin <oleg.drokin@intel.com>,
Andreas Dilger <andreas.dilger@intel.com>,
James Simmons <jsimmons@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
NeilBrown <neilb@suse.com>, Arnd Bergmann <arnd@arndb.de>,
lustre-devel@lists.lustre.org
Subject: [PATCH] staging: lustre: fid: avoid false-positive uninitialized variable warning
Date: Tue, 13 Mar 2018 14:05:16 +0100 [thread overview]
Message-ID: <20180313130532.4015402-1-arnd@arndb.de> (raw)
One of Neil's recent cleanups apparently has led the code to get
to a state where gcc tracks the 'seqnr' variable just enough to
see that it is sometimes initialized in seq_client_alloc_seq(),
but not enough that it can prove this initialization to be reliable
before the use of that variable:
drivers/staging/lustre/lustre/fid/fid_request.c: In function 'seq_client_alloc_fid':
drivers/staging/lustre/lustre/fid/fid_request.c:245:22: error: 'seqnr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
The code seems to be otherwise correct, and I could not come
up with a good way to simplify it further, so this adds a fake
initialization to shut up that warning.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: NeilBrown <neilb@suse.com>
---
drivers/staging/lustre/lustre/fid/fid_request.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/staging/lustre/lustre/fid/fid_request.c b/drivers/staging/lustre/lustre/fid/fid_request.c
index fa23423eb8b3..030680f37c79 100644
--- a/drivers/staging/lustre/lustre/fid/fid_request.c
+++ b/drivers/staging/lustre/lustre/fid/fid_request.c
@@ -174,6 +174,7 @@ static int seq_client_alloc_seq(const struct lu_env *env,
if (rc) {
CERROR("%s: Can't allocate new meta-sequence, rc %d\n",
seq->lcs_name, rc);
+ *seqnr = U64_MAX;
return rc;
}
CDEBUG(D_INFO, "%s: New range - " DRANGE "\n",
--
2.9.0
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next reply other threads:[~2018-03-13 13:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-13 13:05 Arnd Bergmann [this message]
2018-03-13 21:54 ` [PATCH] staging: lustre: fid: avoid false-positive uninitialized variable warning NeilBrown
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