linux-kernel - Re: [PATCH v2] clocksource: Use GENMASK_ULL in definition of CLOCKSOURCE

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Date:   Tue, 18 Apr 2017 10:13:34 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Matthias Kaehlcke <mka@...omium.org>
cc:     John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org,
        Dmitry Torokhov <dtor@...omium.org>,
        Grant Grundler <grundler@...omium.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Michael Davidson <md@...gle.com>
Subject: Re: [PATCH v2] clocksource: Use GENMASK_ULL in definition of
 CLOCKSOURCE_MASK

On Mon, 17 Apr 2017, Matthias Kaehlcke wrote:
> Besides reusing existing code this removes the special case handling
> for 64-bit masks, which causes clang to raise a shift count overflow
> warning due to https://bugs.llvm.org//show_bug.cgi?id=10030.
> 
> Suggested-by: Dmitry Torokhov <dtor@...omium.org>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - Remove unnecessary cast to u64
> 
>  include/linux/clocksource.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
> index cfc75848a35d..f2b10d9ebd04 100644
> --- a/include/linux/clocksource.h
> +++ b/include/linux/clocksource.h
> @@ -120,7 +120,7 @@ struct clocksource {
> #define CLOCK_SOURCE_RESELECT			0x100
>  
>  /* simplify initialization of mask field */
> -#define CLOCKSOURCE_MASK(bits) (u64)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
> +#define CLOCKSOURCE_MASK(bits) GENMASK_ULL((bits) - 1, 0)
>  
>  static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from)
>  {
> -- 
> 2.12.2.762.g0e3151a226-goog

Neither patch nor git-am can apply that patch. Please fix your tools.

Thanks,

	tglx