linux-kernel - Re: [PATCH 0/3] ARM/PSCI: Fix THUMB2

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Message-ID: <26239d41-0d58-43fd-89e9-1576c84f89f2@gmail.com>
Date:   Fri, 28 Sep 2018 10:51:16 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Mark Rutland <mark.rutland@....com>, Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Russell King <linux@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Doug Berger <opendmb@...il.com>,
        Brian Norris <computersforpeace@...il.com>
Subject: Re: [PATCH 0/3] ARM/PSCI: Fix THUMB2_KERNEL entry points

On 09/28/2018 01:08 AM, Robin Murphy wrote:
> On 2018-09-27 8:27 PM, Florian Fainelli wrote:
>> Hi all,
>>
>> While playing with THUMB2_KERNEL on ARCH_BRCMSTB, several issues came up
>> which are addressed by these 3 patches.
> 
> Hmmm, PSCI looks to explicitly support Thumb entrypoints ("T32 support"
> in section 6.4.3 of DEN0022D), so these changes smell a little of
> papering over a more fundamental problem, which is presumably either
> that Thumb symbols are not being resolved correctly, or that the
> firmware you're using has a bug.

Yes, I clearly missed that during the internal review of our
implementation and missed it again prior to submitting those patches,
shame on me.

The last patch is valid because it addresses a problem on 32-bit only
platforms which do not have a PSCI firmware at that point.

Thanks!
-- 
Florian