On 07/18/2014 11:53 AM, Andy Lutomirski wrote:

On Jul 18, 2014 3:20 AM, "Richard Weinberger" <richard@nod.at
<mailto:richard@nod.at>> wrote:

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Am 18.07.2014 12:14, schrieb Will Deacon:

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On Tue, Jul 15, 2014 at 03:47:26PM +0100, Andy Lutomirski wrote:

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On Sun, Jul 13, 2014 at 1:01 PM, Andy Lutomirski

<luto@amacapital.net <mailto:luto@amacapital.net>> wrote:

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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.

Can one of you pull this somewhere?  Otherwise I can put it somewhere
stable and ask for -next inclusion, but that seems like overkill for a
single patch.

For the um bits:
Acked-by: Richard Weinberger <richard@nod.at <mailto:richard@nod.at>>

quoted

I'd be happy to take the arm64 part, but it doesn't feel right for mm/*
changes (or changes to other archs) to go via our tree.

I'm not sure what the best approach is if you want to send this via

a single

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tree. Maybe you could ask akpm nicely?

Going though Andrew's tree sounds sane to me.

Splitting this will be annoying: I'd probably have to add a flag asking
for the new behavior, update all the arches, then remove the flag.  The
chance of screwing up bisectability in the process seems pretty high. 
This seems like overkill for a patch that mostly deletes code.

Akpm, can you take this?

FWIW:

Acked-by: Nathan Lynch <redacted>

This patch allows me to avoid adding a bunch of empty hooks to arch/arm
when adding VDSO support:

http://lists.infradead.org/pipermail/linux-arm-kernel/2014-June/268045.html