ARM: 7701/1: mm: Allow arch code to control the user page table ceiling

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On architectures where a pgd entry may be shared between user and kernel
(e.g. ARM+LPAE), freeing page tables needs a ceiling other than 0. This
patch introduces a generic USER_PGTABLES_CEILING that arch code can
override. It is the responsibility of the arch code setting the ceiling
to ensure the complete freeing of the page tables (usually in
pgd_free()).

[catalin.marinas@arm.com: commit log; shift_arg_pages(), asm-generic/pgtables.h changes]

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: <stable@vger.kernel.org> # 3.3+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

...

This commit is contained in:

Hugh Dickins 2013-04-23 11:20:35 +01:00 • committed by Russell King

parent b361d61dc1

commit a0a9434dd5

3 changed files with 14 additions and 4 deletions

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4

fs/exec.c

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10

include/asm-generic/pgtable.h

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4

mm/mmap.c

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