diff options
| author | Nick Piggin <nickpiggin@yahoo.com.au> | 2005-09-28 06:45:18 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-28 16:46:40 +0200 |
| commit | 8b1f3124618b54cf125dea3a074b9cf469117723 (patch) | |
| tree | 19ef8a7fe9cc5b1c46dc973ea151edab4aba2b8a /include/asm-mips/pgtable.h | |
| parent | Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 (diff) | |
| download | linux-8b1f3124618b54cf125dea3a074b9cf469117723.tar.xz linux-8b1f3124618b54cf125dea3a074b9cf469117723.zip | |
[PATCH] mm: move_pte to remap ZERO_PAGE
Move the ZERO_PAGE remapping complexity to the move_pte macro in
asm-generic, have it conditionally depend on
__HAVE_ARCH_MULTIPLE_ZERO_PAGE, which gets defined for MIPS.
For architectures without __HAVE_ARCH_MULTIPLE_ZERO_PAGE, move_pte becomes
a noop.
From: Hugh Dickins <hugh@veritas.com>
Fix nasty little bug we've missed in Nick's mremap move ZERO_PAGE patch.
The "pte" at that point may be a swap entry or a pte_file entry: we must
check pte_present before perhaps corrupting such an entry.
Patch below against 2.6.14-rc2-mm1, but the same bug is in 2.6.14-rc2's
mm/mremap.c, and more dangerous there since it's affecting all arches: I
think the safest course is to send Nick's patch and Yoichi's build fix and
this fix (build tested) on to Linus - so only MIPS can be affected.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-mips/pgtable.h')
| -rw-r--r-- | include/asm-mips/pgtable.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h index cbd1672c94cb..eaf5d9b3a0e1 100644 --- a/include/asm-mips/pgtable.h +++ b/include/asm-mips/pgtable.h @@ -68,6 +68,8 @@ extern unsigned long zero_page_mask; #define ZERO_PAGE(vaddr) \ (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))) +#define __HAVE_ARCH_MULTIPLE_ZERO_PAGE + extern void paging_init(void); /* |