Re: [PATCH v7 5/7] perf/amd/iommu: Clean up perf_iommu_enable_event

From	Borislav Petkov <bp@alien8.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH v7 5/7] perf/amd/iommu: Clean up perf_iommu_enable_event
Date	2017-01-12 15:20 +0100
Message-ID	<sYOop-4Za-3@gated-at.bofh.it> (permalink)
References	<sY5Ul-2zr-9@gated-at.bofh.it> <sYOop-4Za-5@gated-at.bofh.it>
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On Mon, Jan 09, 2017 at 09:33:45PM -0600, Suravee Suthikulpanit wrote:
> This patch cleans up:
>   * Various bitwise operations in perf_iommu_enable_event
>   * Make use macros BIT(x)
> 
> This should not affect logic and functionality.
> 
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Borislav Petkov <bp@alien8.de>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
> ---
>  arch/x86/events/amd/iommu.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c
> index 9bff41d..2403c78 100644
> --- a/arch/x86/events/amd/iommu.c
> +++ b/arch/x86/events/amd/iommu.c
> @@ -258,21 +258,21 @@ static void perf_iommu_enable_event(struct perf_event *ev)
>  	amd_iommu_pc_set_reg(0, devid, bank, cntr,
>  			     IOMMU_PC_COUNTER_SRC_REG, &reg);
>  
> -	reg = 0ULL | devid | (_GET_DEVID_MASK(ev) << 32);
> +	reg = devid | (_GET_DEVID_MASK(ev) << 32);
>  	if (reg)
> -		reg |= (1UL << 31);
> +		reg |= BIT(31);
>  	amd_iommu_pc_set_reg(0, devid, bank, cntr,
>  			     IOMMU_PC_DEVID_MATCH_REG, &reg);
>  
> -	reg = 0ULL | _GET_PASID(ev) | (_GET_PASID_MASK(ev) << 32);
> +	reg = _GET_PASID(ev) | (_GET_PASID_MASK(ev) << 32);
>  	if (reg)
> -		reg |= (1UL << 31);
> +		reg |= BIT(31);
>  	amd_iommu_pc_set_reg(0, devid, bank, cntr,
>  			     IOMMU_PC_PASID_MATCH_REG, &reg);
>  
> -	reg = 0ULL | _GET_DOMID(ev) | (_GET_DOMID_MASK(ev) << 32);
> +	reg = _GET_DOMID(ev) | (_GET_DOMID_MASK(ev) << 32);
>  	if (reg)
> -		reg |= (1UL << 31);
> +		reg |= BIT(31);
>  	amd_iommu_pc_set_reg(0, devid, bank, cntr,
>  			     IOMMU_PC_DOMID_MATCH_REG, &reg);
>  }
> -- 

Ah ok, you're doing it here, good.

For the next version of the patchset, please reorder all cleanups first
and then the patches adding functional changes/new features.

Thanks.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

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Re: [PATCH v7 5/7] perf/amd/iommu: Clean up perf_iommu_enable_event Borislav Petkov <bp@alien8.de> - 2017-01-12 15:20 +0100

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