From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: will@kernel.org, catalin.marinas@arm.com
Cc: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] arm64: cpufeature: Fix feature comparison for CTR_EL0.{CWG,ERG}
Date: Tue, 30 Jul 2019 15:45:41 +0100 [thread overview]
Message-ID: <e483de62-b088-ae58-0d8e-e12bff6d0819@arm.com> (raw)
In-Reply-To: <20190730144020.3518-1-will@kernel.org>
On 07/30/2019 03:40 PM, Will Deacon wrote:
> If CTR_EL0.{CWG,ERG} are 0b0000 then they must be interpreted to have
> their architecturally maximum values, which defeats the use of
> FTR_HIGHER_SAFE when sanitising CPU ID registers on heterogeneous
> machines.
>
> Introduce FTR_HIGHER_OR_ZERO_SAFE so that these fields effectively
> saturate at zero.
>
> Cc: Suzuki Poulose <suzuki.poulose@arm.com>
> Fixes: 3c739b571084 ("arm64: Keep track of CPU feature registers")
> Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
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next prev parent reply other threads:[~2019-07-30 14:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 14:40 [PATCH] arm64: cpufeature: Fix feature comparison for CTR_EL0.{CWG, ERG} Will Deacon
2019-07-30 14:45 ` Suzuki K Poulose [this message]
2019-07-30 16:53 ` Mark Rutland
2019-07-31 17:11 ` [PATCH] arm64: cpufeature: Fix feature comparison for CTR_EL0.{CWG,ERG} Catalin Marinas
2019-08-05 17:14 Will Deacon
2019-08-07 15:52 ` Greg KH
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