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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
To:     Andrew Morton <akpm@linux-foundation.org>,
        linux-arch <linux-arch@vger.kernel.org>
Cc:     linux-s390@vger.kernel.org,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Arnd Bergmann <arnd@arndb.de>, linuxppc-dev@lists.ozlabs.org,
        x86@kernel.org, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        linux-mtd@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Masahiro Yamada <yamada.masahiro@socionext.com>
Subject: [PATCH v2 05/11] mtd: rawnand: vf610_nfc: add initializer to avoid -Wmaybe-uninitialized
Date:   Fri, 19 Apr 2019 18:47:48 +0900
Message-Id: <20190419094754.24667-6-yamada.masahiro@socionext.com>
In-Reply-To: <20190419094754.24667-1-yamada.masahiro@socionext.com>
References: <20190419094754.24667-1-yamada.masahiro@socionext.com>
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Sender: linux-kernel-owner@vger.kernel.org
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This prepares to move CONFIG_OPTIMIZE_INLINING from x86 to a common
place. We need to eliminate potential issues beforehand.

Kbuild test robot has never reported -Wmaybe-uninitialized warning
for this probably because vf610_nfc_run() is inlined by the x86
compiler's inlining heuristic.

If CONFIG_OPTIMIZE_INLINING is enabled for a different architecture
and vf610_nfc_run() is not inlined, the following warning is reported:

drivers/mtd/nand/raw/vf610_nfc.c: In function ‘vf610_nfc_cmd’:
drivers/mtd/nand/raw/vf610_nfc.c:455:3: warning: ‘offset’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   vf610_nfc_rd_from_sram(instr->ctx.data.buf.in + offset,
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            nfc->regs + NFC_MAIN_AREA(0) + offset,
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            trfr_sz, !nfc->data_access);
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v2:
  - split into a separate patch

 drivers/mtd/nand/raw/vf610_nfc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/vf610_nfc.c b/drivers/mtd/nand/raw/vf610_nfc.c
index a662ca1970e5..19792d725ec2 100644
--- a/drivers/mtd/nand/raw/vf610_nfc.c
+++ b/drivers/mtd/nand/raw/vf610_nfc.c
@@ -364,7 +364,7 @@ static int vf610_nfc_cmd(struct nand_chip *chip,
 {
 	const struct nand_op_instr *instr;
 	struct vf610_nfc *nfc = chip_to_nfc(chip);
-	int op_id = -1, trfr_sz = 0, offset;
+	int op_id = -1, trfr_sz = 0, offset = 0;
 	u32 col = 0, row = 0, cmd1 = 0, cmd2 = 0, code = 0;
 	bool force8bit = false;
 
-- 
2.17.1