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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <5587539.MhkbZ0Pkbq@diego>
Date:   Thu, 25 Feb 2021 22:19:32 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Mark Brown <broonie@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Arnd Bergmann <arnd@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Jon Lin <jon.lin@...k-chips.com>,
        Chris Ruehl <chris.ruehl@...ys.com.hk>,
        Alexander Kochetkov <al.kochet@...il.com>,
        Johan Jonker <jbx6244@...il.com>,
        Vincent Pelletier <plr.vincent@...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] spi: rockchip: avoid objtool warning

Am Donnerstag, 25. Februar 2021, 13:55:34 CET schrieb Arnd Bergmann:
> 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
> 
> Use BUG() instead of unreachable() to avoid the undefined behavior
> if it does happen.
> 
> Fixes: 65498c6ae241 ("spi: rockchip: support 4bit words")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Heiko Stuebner <heiko@...ech.de>

> ---
>  drivers/spi/spi-rockchip.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
> index 936ef54e0903..972beac1169a 100644
> --- a/drivers/spi/spi-rockchip.c
> +++ b/drivers/spi/spi-rockchip.c
> @@ -521,7 +521,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs,
>  		 * ctlr->bits_per_word_mask, so this shouldn't
>  		 * happen
>  		 */
> -		unreachable();
> +		BUG();
>  	}
>  
>  	if (use_dma) {
>