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From: Greg KH <gregkh@linuxfoundation.org>
To: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: stable@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	will@kernel.org, mark.rutland@arm.com, catalin.marinas@arm.com
Subject: Re: [PATCH] arm64: cpufeature: Fix truncating a feature value
Date: Fri, 11 Oct 2019 06:55:38 +0200
Message-ID: <20191011045538.GA977916@kroah.com> (raw)
In-Reply-To: <20191010131943.26822-1-suzuki.poulose@arm.com>

On Thu, Oct 10, 2019 at 02:19:43PM +0100, Suzuki K Poulose wrote:
> A signed feature value is truncated to turn to an unsigned value
> causing bad state in the system wide infrastructure. This affects
> the discovery of FP/ASIMD support on arm64. Fix this by making sure
> we cast it properly.
> 
> This was inadvertently fixed upstream in v4.6 onwards with the following :
> commit 28c5dcb22f90113dea ("arm64: Rename cpuid_feature field extract routines")

What prevents us from just taking that commit instead?  You did not
document that here at all, which I thought I asked for.

Also, you only need 12 digits for a sha1, 28c5dcb22f90 ("arm64: Rename
cpuid_feature field extract routines") would be just fine :)

thanks,

greg k-h

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-10 11:08 Suzuki K Poulose
2019-10-10 11:12 ` Suzuki K Poulose
2019-10-10 12:29   ` Greg KH
2019-10-10 12:46     ` Suzuki K Poulose
2019-10-10 13:16       ` Greg KH
2019-10-10 13:19     ` Suzuki K Poulose
2019-10-11  4:55       ` Greg KH [this message]
2019-10-11 10:31         ` Suzuki K Poulose
2019-10-11 12:13           ` Greg KH

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