Re: [PATCH v4] arm64, ia64, ppc, s390, sh, tile, um, x86, mm: Remove default gate area
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- To: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
- Subject: Re: [PATCH v4] arm64, ia64, ppc, s390, sh, tile, um, x86, mm: Remove default gate area
- From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
- Date: Tue, 29 Jul 2014 12:19:16 +1000
- Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, Catalin Marinas <catalin.marinas@xxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, linux-mm@xxxxxxxxx, Paul Mackerras <paulus@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, Richard Weinberger <richard@xxxxxx>, x86@xxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, user-mode-linux-devel@xxxxxxxxxxxxxxxxxxxxx, Will Deacon <will.deacon@xxxxxxx>, Jeff Dike <jdike@xxxxxxxxxxx>, Chris Metcalf <cmetcalf@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Tony Luck <tony.luck@xxxxxxxxx>, Nathan Lynch <Nathan_Lynch@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, linux390@xxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx
- In-reply-to: <6435254cc74d6e9172931f27be3854d522ad299b.1406232860.git.luto@amacapital.net>
- List-id: <linux-ia64.vger.kernel.org>
- References: <6435254cc74d6e9172931f27be3854d522ad299b.1406232860.git.luto@amacapital.net>
On Thu, 2014-07-24 at 13:56 -0700, Andy Lutomirski wrote:
> The core mm code will provide a default gate area based on
> FIXADDR_USER_START and FIXADDR_USER_END if
> !defined(__HAVE_ARCH_GATE_AREA) && defined(AT_SYSINFO_EHDR).
>
> This default is only useful for ia64. arm64, ppc, s390, sh, tile,
> 64-bit UML, and x86_32 have their own code just to disable it. arm,
> 32-bit UML, and x86_64 have gate areas, but they have their own
> implementations.
>
> This gets rid of the default and moves the code into ia64.
>
> This should save some code on architectures without a gate area: it's
> now possible to inline the gate_area functions in the default case.
Looks good to me. Booted and everything seems happy, I still have a vdso etc.
Tested-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> (for powerpc)
cheers
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