linux-kernel - Re: [PATCH V3 01/15] arm: perf: cleanup cppcheck shifting error

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Date:   Tue, 25 Jun 2019 18:21:07 +0100
From:   Will Deacon <will@...nel.org>
To:     Phong Tran <tranmanphong@...il.com>
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Subject: Re: [PATCH V3 01/15] arm: perf: cleanup cppcheck shifting error

On Tue, Jun 25, 2019 at 11:03:42AM +0700, Phong Tran wrote:
> There is error from cppcheck tool
> "Shifting signed 32-bit value by 31 bits is undefined behaviour errors"
> change to use BIT() marco for improvement.

s/marco/macro/

As Peter pointed out, this "error" is also a false positive also for the
kernel.

> Signed-off-by: Phong Tran <tranmanphong@...il.com>
> ---
>  arch/arm/kernel/perf_event_v7.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
> index a4fb0f8b8f84..2924d7910b10 100644
> --- a/arch/arm/kernel/perf_event_v7.c
> +++ b/arch/arm/kernel/perf_event_v7.c
> @@ -697,9 +697,9 @@ static struct attribute_group armv7_pmuv2_events_attr_group = {
>  /*
>   * Event filters for PMUv2
>   */
> -#define	ARMV7_EXCLUDE_PL1	(1 << 31)
> -#define	ARMV7_EXCLUDE_USER	(1 << 30)
> -#define	ARMV7_INCLUDE_HYP	(1 << 27)
> +#define	ARMV7_EXCLUDE_PL1	BIT(31)
> +#define	ARMV7_EXCLUDE_USER	BIT(30)
> +#define	ARMV7_INCLUDE_HYP	BIT(27)

Acked-by: Will Deacon <will.deacon@....com>

You can drop this into Russell's patch system[1].

Will

[1] https://www.arm.linux.org.uk/developer/patches/