linux-kernel - Re: [RFC][PATCH] treewide: Move set_memory

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Message-ID: <20170208092830.GB30215@arm.com>
Date:   Wed, 8 Feb 2017 09:28:30 +0000
From:   Will Deacon <will.deacon@....com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Laura Abbott <labbott@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [RFC][PATCH] treewide: Move set_memory_* functions away from
 cacheflush.h

On Tue, Feb 07, 2017 at 01:25:53PM -0800, Kees Cook wrote:
> On Tue, Feb 7, 2017 at 1:10 PM, Laura Abbott <labbott@...hat.com> wrote:
> > The set_memory_* APIs came out of a desire to have a better way to
> > change memory attributes. Many of these attributes were linked to cache
> > functionality so the prototypes were put in cacheflush.h. These days,
> > the APIs have grown and have a much wider use than just cache APIs. To
> > support this growth, split off set_memory_* and friends into a separate
> > header file to avoid growing cacheflush.h for APIs that have nothing to
> > do with caches.
> >
> > Signed-off-by: Laura Abbott <labbott@...hat.com>
> > ---
> > This came out of a comment Russell made while reviewing RODATA test cases
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2017-January/480855.html
> > While the final result of that series was the rodata code was refactored into
> > its own header file, the set_memory_* APIs are still out of place.
> 
> Yeah, this is a nice clean up to start on.
> 
> > This is a simple attempt at moving all the API stubs to their own file.
> > Another idea I had was throwing set_memory_{x,nx,ro,rw} in an asm-generic
> > file since those are commonly used for module setting across all arches.
> 
> It seems like asm-generic would be cleaner, yes? Only a few archs have
> anything "special" happening in the resulting header files.

I'd also prefer the asm-generic approach if it makes the arch part a simple
addition to asm/Kbuild.

Will