linux-kernel - Re: [PATCH] [v2] spi: rockchip: avoid objtool warning

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Message-ID: <20210226155341.cqqkmu2g6mmy673s@ti.com>
Date:   Fri, 26 Feb 2021 21:23:43 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Arnd Bergmann <arnd@...nel.org>
CC:     Mark Brown <broonie@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Jon Lin <jon.lin@...k-chips.com>,
        Johan Jonker <jbx6244@...il.com>, <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] [v2] spi: rockchip: avoid objtool warning

On 26/02/21 03:00PM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Building this file with clang leads to a an unreachable code path
> causing a warning from objtool:
> 
> drivers/spi/spi-rockchip.o: warning: objtool: rockchip_spi_transfer_one()+0x2e0: sibling call from callable instruction with modified stack frame
> 
> Change the unreachable() into an error return that can be
> handled if it ever happens, rather than silently crashing
> the kernel.
> 
> Fixes: 65498c6ae241 ("spi: rockchip: support 4bit words")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Pratyush Yadav <p.yadav@...com>

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.