Re: [PATCH v6 1/6] ARM: Add TTBR operator for kasan_init

From: Linus Walleij <linus.walleij@linaro.org>
To: Florian Fainelli <f.fainelli@gmail.com>,
	Russell King <rmk+kernel@armlinux.org.uk>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
	mhocko@suse.com, Catalin Marinas <catalin.marinas@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	David Howells <dhowells@redhat.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Alexander Potapenko <glider@google.com>,
	kvmarm@lists.cs.columbia.edu, Jonathan Corbet <corbet@lwn.net>,
	Abbott Liu <liuwenliang@huawei.com>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Russell King <linux@armlinux.org.uk>,
	kasan-dev@googlegroups.com,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Andre Przywara <andre.przywara@arm.com>,
	philip@cog.systems, jinb.park7@gmail.com,
	Thomas Gleixner <tglx@linutronix.de>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Nicolas Pitre <nico@fluxnic.net>,
	Greg KH <gregkh@linuxfoundation.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Rob Landley <rob@landley.net>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	thgarnie@google.com, kirill.shutemov@linux.intel.com
Subject: Re: [PATCH v6 1/6] ARM: Add TTBR operator for kasan_init
Date: Tue, 2 Jul 2019 23:03:50 +0200	[thread overview]
Message-ID: <CACRpkdZGqiiax2m5L1y3=Enw0Q5cLc-idAQNae34uenf-drHDw@mail.gmail.com> (raw)
In-Reply-To: <20190617221134.9930-2-f.fainelli@gmail.com>

Hi Florian!

thanks for your patch!

On Tue, Jun 18, 2019 at 12:11 AM Florian Fainelli <f.fainelli@gmail.com> wrote:

> From: Abbott Liu <liuwenliang@huawei.com>
>
> The purpose of this patch is to provide set_ttbr0/get_ttbr0 to
> kasan_init function. The definitions of cp15 registers should be in
> arch/arm/include/asm/cp15.h rather than arch/arm/include/asm/kvm_hyp.h,
> so move them.
>
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Reported-by: Marc Zyngier <marc.zyngier@arm.com>
> Signed-off-by: Abbott Liu <liuwenliang@huawei.com>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

> +#include <linux/stringify.h>

What is this for? I think it can be dropped.

This stuff adding a whole bunch of accessors:

> +static inline void set_par(u64 val)
> +{
> +       if (IS_ENABLED(CONFIG_ARM_LPAE))
> +               write_sysreg(val, PAR_64);
> +       else
> +               write_sysreg(val, PAR_32);
> +}

Can we put that in a separate patch since it is not
adding any users, so this is a pure refactoring patch for
the current code?

Yours,
Linus Walleij
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