The patch titled
hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regionspatch-in-mm-fix
has been added to the -mm tree. Its filename is
hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regionspatch-in-mm-fix.patch
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------------------------------------------------------
Subject: hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regionspatch-in-mm-fix
From: Eric B Munson <ebmunson@xxxxxxxxxx>
The patch
hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch
used the value 0x40 for MAP_HUGETLB which is the same value used for
various other flags on some architectures. This collision causes
unexpected use of huge pages in the best case and mmap to fail with
ENOMEM or ENOSYS in the worst. This patch changes the value for
MAP_HUGETLB to a value that is not currently used on any arch.
This patch should be considered a fix to
hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch.
Reported-by: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
Signed-off-by: Eric B Munson <ebmunson@xxxxxxxxxx>
Acked-by: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Adam Litke <agl@xxxxxxxxxx>
Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Cc: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/mman-common.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/asm-generic/mman-common.h~hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regionspatch-in-mm-fix include/asm-generic/mman-common.h
--- a/include/asm-generic/mman-common.h~hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regionspatch-in-mm-fix
+++ a/include/asm-generic/mman-common.h
@@ -19,7 +19,7 @@
#define MAP_TYPE 0x0f /* Mask for type of mapping */
#define MAP_FIXED 0x10 /* Interpret addr exactly */
#define MAP_ANONYMOUS 0x20 /* don't use a file */
-#define MAP_HUGETLB 0x40 /* create a huge page mapping */
+#define MAP_HUGETLB 0x080000 /* create a huge page mapping */
#define MS_ASYNC 1 /* sync memory asynchronously */
#define MS_INVALIDATE 2 /* invalidate the caches */
_
Patches currently in -mm which might be from ebmunson@xxxxxxxxxx are
hugetlbfs-allow-the-creation-of-files-suitable-for-map_private-on-the-vfs-internal-mount.patch
hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regions.patch
hugetlb-add-map_hugetlb-for-mmaping-pseudo-anonymous-huge-page-regionspatch-in-mm-fix.patch
hugetlb-add-map_hugetlb-example.patch
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