linux-kernel - [PATCH 3.16 089/178] IB/qib: fix false-postive maybe-uninitialized warning

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Message-ID: <lsq.1500213406.74534148@decadent.org.uk>
Date:   Sun, 16 Jul 2017 14:56:46 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Doug Ledford" <dledford@...hat.com>,
        "Ira Weiny" <ira.weiny@...el.com>, "Arnd Bergmann" <arnd@...db.de>
Subject: [PATCH 3.16 089/178] IB/qib: fix false-postive maybe-uninitialized
 warning

3.16.46-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit f6aafac184a3e46e919769dd4faa8bf0dc436534 upstream.

aarch64-linux-gcc-7 complains about code it doesn't fully understand:

drivers/infiniband/hw/qib/qib_iba7322.c: In function 'qib_7322_txchk_change':
include/asm-generic/bitops/non-atomic.h:105:35: error: 'shadow' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The code is right, and despite trying hard, I could not come up with a version
that I liked better than just adding a fake initialization here to shut up the
warning.

Fixes: f931551bafe1 ("IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Ira Weiny <ira.weiny@...el.com>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/infiniband/hw/qib/qib_iba7322.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -7078,7 +7078,7 @@ static void qib_7322_txchk_change(struct
 	unsigned long flags;
 
 	while (wait) {
-		unsigned long shadow;
+		unsigned long shadow = 0;
 		int cstart, previ = -1;
 
 		/*