linux-kernel - Re: [PATCH] watchdog: coh901327: add COMMON

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 for Android: free password hash cracker in your pocket

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

Date:   Thu, 10 Dec 2020 15:00:30 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>, linux-watchdog@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] watchdog: coh901327: add COMMON_CLK dependency

On Thu, Dec 3, 2020 at 2:34 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> clang produces a build failure in configurations without COMMON_CLK
> when a timeout calculation goes wrong:
>
> arm-linux-gnueabi-ld: drivers/watchdog/coh901327_wdt.o: in function `coh901327_enable':
> coh901327_wdt.c:(.text+0x50): undefined reference to `__bad_udelay'

Isn't a linkage failure against __bad_udelay supposed to be
interpreted as a value too large being passed to udelay()? IIRC, this
was an issue for someone building an Apple touchpad driver with Clang
at -O3...you sent a fix for that:
https://github.com/ClangBuiltLinux/linux/issues/678,
https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git/commit/?id=fff2d0f701e6753591609739f8ab9be1c8e80ebb.

>
> Add a Kconfig dependency to only do build testing when COMMON_CLK
> is enabled.
>
> Fixes: da2a68b3eb47 ("watchdog: Enable COMPILE_TEST where possible")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/watchdog/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 8bdbd125821b..32fa6de7b820 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -631,7 +631,7 @@ config SUNXI_WATCHDOG
>
>  config COH901327_WATCHDOG
>         bool "ST-Ericsson COH 901 327 watchdog"
> -       depends on ARCH_U300 || (ARM && COMPILE_TEST)
> +       depends on ARCH_U300 || (ARM && COMMON_CLK && COMPILE_TEST)
>         default y if MACH_U300
>         select WATCHDOG_CORE
>         help
> --
> 2.27.0
>


-- 
Thanks,
~Nick Desaulniers