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Date:	Tue, 29 Jul 2014 12:19:16 +1000
From:	Michael Ellerman <>
To:	Andy Lutomirski <>
Cc:	Andrew Morton <>,,,
	Catalin Marinas <>,
	Heiko Carstens <>,,
	Paul Mackerras <>,
	"H. Peter Anvin" <>,,, Richard Weinberger <>,, Ingo Molnar <>,
	Fenghua Yu <>,,
	Will Deacon <>,
	Jeff Dike <>,
	Chris Metcalf <>,
	Thomas Gleixner <>,,
	Tony Luck <>,
	Nathan Lynch <>,,
	Martin Schwidefsky <>,,
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
> !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 <> (for powerpc)


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