linux-kernel - Re: [PATCH 3/5] arm64: debug: Treat the BRPs/WRPs as unsigned

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Date:	Mon, 23 Nov 2015 17:29:59 +0000
From:	Will Deacon <will.deacon@....com>
To:	"Suzuki K. Poulose" <suzuki.poulose@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
	mark.rutland@....com, ard.biesheuvel@...aro.org,
	linux-kernel@...r.kernel.org, takahiro.akashi@...aro.org
Subject: Re: [PATCH 3/5] arm64: debug: Treat the BRPs/WRPs as unsigned

On Wed, Nov 18, 2015 at 05:08:58PM +0000, Suzuki K. Poulose wrote:
> IDAA64DFR0_EL1: BRPs and WRPs are unsigned values. Use
> the appropriate helpers to extract those fields.
> 
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Reported-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@....com>
> ---
>  arch/arm64/include/asm/hw_breakpoint.h |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Once you've got the dependencies sorted out:

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

Will

> diff --git a/arch/arm64/include/asm/hw_breakpoint.h b/arch/arm64/include/asm/hw_breakpoint.h
> index e54415e..9732908 100644
> --- a/arch/arm64/include/asm/hw_breakpoint.h
> +++ b/arch/arm64/include/asm/hw_breakpoint.h
> @@ -138,16 +138,18 @@ extern struct pmu perf_ops_bp;
>  /* Determine number of BRP registers available. */
>  static inline int get_num_brps(void)
>  {
> +	u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1);
>  	return 1 +
> -		cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1),
> +		cpuid_feature_extract_unsigned_field(dfr0,
>  						ID_AA64DFR0_BRPS_SHIFT);
>  }
>  
>  /* Determine number of WRP registers available. */
>  static inline int get_num_wrps(void)
>  {
> +	u64 dfr0 = read_system_reg(SYS_ID_AA64DFR0_EL1);
>  	return 1 +
> -		cpuid_feature_extract_field(read_system_reg(SYS_ID_AA64DFR0_EL1),
> +		cpuid_feature_extract_unsigned_field(dfr0,
>  						ID_AA64DFR0_WRPS_SHIFT);
>  }
>  
> -- 
> 1.7.9.5
> 
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