linux-kernel - Re: [PATCH v4] arm64, ia64, ppc, s390, sh, tile, um, x86, mm: Remove default gate area

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Date:	Tue, 29 Jul 2014 12:19:16 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ia64@...r.kernel.org, linux-sh@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Heiko Carstens <heiko.carstens@...ibm.com>, linux-mm@...ck.org,
	Paul Mackerras <paulus@...ba.org>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	linux-s390@...r.kernel.org, Richard Weinberger <richard@....at>,
	x86@...nel.org, Ingo Molnar <mingo@...hat.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	Will Deacon <will.deacon@....com>,
	Jeff Dike <jdike@...toit.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	Tony Luck <tony.luck@...el.com>,
	Nathan Lynch <Nathan_Lynch@...tor.com>,
	linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4] arm64, ia64, ppc, s390, sh, tile, um, x86, mm:
 Remove default gate area

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@...erman.id.au> (for powerpc)

cheers


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