linux-kernel - Re: [PATCH v2 1/7] arm64: capabilities: Merge entries for ARM64_WORKAROUND_CLEAN

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Message-ID: <20181206095825.GA22201@arm.com>
Date:   Thu, 6 Dec 2018 09:58:27 +0000
From:   Will Deacon <will.deacon@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, dave.martin@....com, mark.rutland@....com,
        vladimir.murzin@....com, Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH v2 1/7] arm64: capabilities: Merge entries for
 ARM64_WORKAROUND_CLEAN_CACHE

On Wed, Dec 05, 2018 at 05:14:53PM +0000, Suzuki K Poulose wrote:
> On 05/12/2018 15:02, Will Deacon wrote:
> >On Fri, Nov 30, 2018 at 05:18:00PM +0000, Suzuki K Poulose wrote:
> >>diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
> >>index 12f93e4d..2e26375 100644
> >>--- a/arch/arm64/include/asm/cputype.h
> >>+++ b/arch/arm64/include/asm/cputype.h
> >>@@ -151,6 +151,7 @@ struct midr_range {
> >>  		.rv_max = MIDR_CPU_VAR_REV(v_max, r_max),	\
> >>  	}
> >>+#define MIDR_REV_RANGE(m, v, r_min, r_max) MIDR_RANGE(m, v, r_min, v, r_max)
> >
> >What's the point of this macro?
> 
> That can be used to specify a set of MIDRs which has the same "variant" but a
> range of "revisions". This is used for the A53 errata and also for the Cavium
> errata in the following patch.

Gah, I read this at least 10 times and I /still/ failed to spot the extra
'v' argument to MIDR_RANGE!

Ignore my silly comment; I'll queue this up today. Thanks.

Will