linux-kernel - Re: [PATCH] arm64: Fix the kernel panic() on QDF2400 platform

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Message-ID: <20170223144550.GE27512@arm.com>
Date:   Thu, 23 Feb 2017 14:45:50 +0000
From:   Will Deacon <will.deacon@....com>
To:     Shanker Donthineni <shankerd@...eaurora.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        James Morse <james.morse@....com>,
        Mark Rutland <mark.rutland@....com>,
        Vikram Sethi <vikrams@...eaurora.org>
Subject: Re: [PATCH] arm64: Fix the kernel panic() on QDF2400 platform

On Wed, Feb 22, 2017 at 09:10:48PM -0600, Shanker Donthineni wrote:
> The commit 38fd94b0 'arm64: Work around Falkor erratum 1003' has
> been added to fix the hardware bug but causing a system crash.
> The value of the register x1 which contains 'struct mm_struct *'
> should be preserved inside macro pre_ttbr0_update_workaround.
> 
> Macro pre_ttbr0_update_workaround expects 2nd and 3rd arguments
> are temporary registers. Don't clobber register x1, Otherwise
> the next load operation 'mmid x1 x1' access the invalid address.

Whilst I'm pleased that you've sent a fix (and I'll pick it up), I have
to ask... did anybody actually test the original patch? If so, why wasn't
this found earlier?

Will