linux-kernel - [PATCH v3 04/10] mtd: rawnand: vf610_nfc: add initializer to avoid -Wmaybe-uninitialized

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Date:   Tue, 23 Apr 2019 12:21:00 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>
Cc:     linux-s390@...r.kernel.org,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
        x86@...nel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Christophe Leroy <christophe.leroy@....fr>,
        Mathieu Malaterre <malat@...ian.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: [PATCH v3 04/10] mtd: rawnand: vf610_nfc: add initializer to avoid -Wmaybe-uninitialized

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@...ionext.com>
---

Changes in v3: None
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