From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Tue, 12 Nov 2013 23:07:54 +0000 (-0800)
Subject: mmap: arch_get_unmapped_area(): use proper mmap base for bottom up direction
X-Git-Tag: v3.13-rc1~106^2~207
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e99b02131b280b064d30a5926ef1c4763f3097b;p=pandora-kernel.git

mmap: arch_get_unmapped_area(): use proper mmap base for bottom up direction

This is more or less the generic variant of commit 41aacc1eea64 ("x86
get_unmapped_area: Access mmap_legacy_base through mm_struct member").

So effectively architectures which use an own arch_pick_mmap_layout()
implementation but call the generic arch_get_unmapped_area() now can
also randomize their mmap_base.

All architectures which have an own arch_pick_mmap_layout() and call the
generic arch_get_unmapped_area() (arm64, s390, tile) currently set
mmap_base to TASK_UNMAPPED_BASE.  This is also true for the generic
arch_pick_mmap_layout() function.  So this change is a no-op currently.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Radu Caragea <sinaelgl@gmail.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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