Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 2 May 2019 16:13:46 +0200
From:   Miquel Raynal <miquel.raynal@bootlin.com>
To:     Masahiro Yamada <yamada.masahiro@socionext.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        linux-s390@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
        Mathieu Malaterre <malat@debian.org>, x86@kernel.org,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
        Ingo Molnar <mingo@redhat.com>, linux-mtd@lists.infradead.org,
        linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [RESEND PATCH v3 05/11] mtd: rawnand: vf610_nfc: add
 initializer to avoid -Wmaybe-uninitialized
Message-ID: <20190502161346.07c15187@xps13>
In-Reply-To: <20190423034959.13525-6-yamada.masahiro@socionext.com>
References: <20190423034959.13525-1-yamada.masahiro@socionext.com>
        <20190423034959.13525-6-yamada.masahiro@socionext.com>
Organization: Bootlin
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8BIT
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Masahiro,

Masahiro Yamada <yamada.masahiro@socionext.com> wrote on Tue, 23 Apr
2019 12:49:53 +0900:

> 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);
>             ~~~~~~~~~~~~~~~~~~~~~~~~~~~

IMHO this patch has no dependencies with this series.
Would you mind sending it alone with the proper Fixes tag?

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

Thanks,
Miquèl