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Subject: Re: [PATCH v6 2/6] ARM: Disable instrumentation for some code
To:     Linus Walleij <linus.walleij@linaro.org>
Cc:     Linux ARM <linux-arm-kernel@lists.infradead.org>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Abbott Liu <liuwenliang@huawei.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Russell King <linux@armlinux.org.uk>, christoffer.dall@arm.com,
        Marc Zyngier <marc.zyngier@arm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Nicolas Pitre <nico@fluxnic.net>,
        Vladimir Murzin <vladimir.murzin@arm.com>,
        Kees Cook <keescook@chromium.org>, jinb.park7@gmail.com,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Rob Landley <rob@landley.net>,
        Greg KH <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Thomas Gleixner <tglx@linutronix.de>, thgarnie@google.com,
        David Howells <dhowells@redhat.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Andre Przywara <andre.przywara@arm.com>,
        julien.thierry@arm.com, drjones@redhat.com, philip@cog.systems,
        mhocko@suse.com, kirill.shutemov@linux.intel.com,
        kasan-dev@googlegroups.com,
        Linux Doc Mailing List <linux-doc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        kvmarm@lists.cs.columbia.edu,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>
References: <20190617221134.9930-1-f.fainelli@gmail.com>
 <20190617221134.9930-3-f.fainelli@gmail.com>
 <CACRpkdb3P6oQTK9FGUkMj4kax8us3rKH6c36pX=HD1_wMqcoJQ@mail.gmail.com>
From:   Florian Fainelli <f.fainelli@gmail.com>
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Date:   Thu, 11 Jul 2019 09:53:51 -0700
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On 7/2/19 2:56 PM, Linus Walleij wrote:
> On Tue, Jun 18, 2019 at 12:11 AM Florian Fainelli <f.fainelli@gmail.com> wrote:
> 
>> @@ -236,7 +236,8 @@ static int unwind_pop_register(struct unwind_ctrl_block *ctrl,
>>                 if (*vsp >= (unsigned long *)ctrl->sp_high)
>>                         return -URC_FAILURE;
>>
>> -       ctrl->vrs[reg] = *(*vsp)++;
>> +       ctrl->vrs[reg] = READ_ONCE_NOCHECK(*(*vsp));
>> +       (*vsp)++;
> 
> I would probably even put in a comment here so it is clear why we
> do this. Passers-by may not know that READ_ONCE_NOCHECK() is
> even related to KASan.

Makes sense, I will add that, thanks!

> 
> Other than that,
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> 
> Yours,
> Linus Walleij
> 


-- 
Florian