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

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Message-Id: <20170314121855.237347-1-arnd@arndb.de>
Date:   Tue, 14 Mar 2017 13:18:45 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Mike Marciniszyn <infinipath@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        Don Hiatt <don.hiatt@...el.com>,
        Jubin John <jubin.john@...el.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RESEND PATCH] IB/qib: fix false-postive maybe-uninitialized warning

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>
---
Submitted originally on Feb 27, the patch is still required on v4.11-rc2 to get
a clean build.
---
 drivers/infiniband/hw/qib/qib_iba7322.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c
index 12c4208fd701..af9f596bb68b 100644
--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -7068,7 +7068,7 @@ static void qib_7322_txchk_change(struct qib_devdata *dd, u32 start,
 	unsigned long flags;
 
 	while (wait) {
-		unsigned long shadow;
+		unsigned long shadow = 0;
 		int cstart, previ = -1;
 
 		/*
-- 
2.9.0