linux-kernel - Re: [PATCH] platform/x86: thinkpad_acpi: Fix bitwise vs. logical warning

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Date:   Tue, 19 Oct 2021 17:20:47 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Mark Gross <markgross@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tor Vic <torvic9@...lbox.org>
Subject: Re: [PATCH] platform/x86: thinkpad_acpi: Fix bitwise vs. logical
 warning

Hi,

On 10/18/21 20:25, Nathan Chancellor wrote:
> A new warning in clang points out a use of bitwise OR with boolean
> expressions in this driver:
> 
> drivers/platform/x86/thinkpad_acpi.c:9061:11: error: use of bitwise '|' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
>         else if ((strlencmp(cmd, "level disengaged") == 0) |
>                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>                                                            ||
> drivers/platform/x86/thinkpad_acpi.c:9061:11: note: cast one or both operands to int to silence this warning
> 1 error generated.
> 
> This should clearly be a logical OR so change it to fix the warning.
> 
> Fixes: fe98a52ce754 ("ACPI: thinkpad-acpi: add sysfs support to fan subdriver")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1476
> Reported-by: Tor Vic <torvic9@...lbox.org>
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans


> ---
>  drivers/platform/x86/thinkpad_acpi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 07b9710d500e..7442c3bb446a 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -9058,7 +9058,7 @@ static int fan_write_cmd_level(const char *cmd, int *rc)
>  
>  	if (strlencmp(cmd, "level auto") == 0)
>  		level = TP_EC_FAN_AUTO;
> -	else if ((strlencmp(cmd, "level disengaged") == 0) |
> +	else if ((strlencmp(cmd, "level disengaged") == 0) ||
>  			(strlencmp(cmd, "level full-speed") == 0))
>  		level = TP_EC_FAN_FULLSPEED;
>  	else if (sscanf(cmd, "level %d", &level) != 1)
> 
> base-commit: 85303db36b6e170917a7bc6aae4898c31a5272a0
>