The patch titled
Subject: mm/mmap.c: optimization of do_mmap_pgoff function
has been added to the -mm tree. Its filename is
mm-mmapc-optimization-of-do_mmap_pgoff-function.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mmapc-optimization-of-do_mmap_pgoff-function.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mmapc-optimization-of-do_mmap_pgoff-function.patch
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------------------------------------------------------
From: Piotr Kwapulinski <kwapulinski.piotr@xxxxxxxxx>
Subject: mm/mmap.c: optimization of do_mmap_pgoff function
The simple check for zero length memory mapping may be performed earlier.
So that in case of zero length memory mapping some unnecessary code is not
executed at all. It does not make the code less readable and saves some
CPU cycles.
Signed-off-by: Piotr Kwapulinski <kwapulinski.piotr@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN mm/mmap.c~mm-mmapc-optimization-of-do_mmap_pgoff-function mm/mmap.c
--- a/mm/mmap.c~mm-mmapc-optimization-of-do_mmap_pgoff-function
+++ a/mm/mmap.c
@@ -1271,6 +1271,9 @@ unsigned long do_mmap_pgoff(struct file
*populate = 0;
+ if (!len)
+ return -EINVAL;
+
/*
* Does the application expect PROT_READ to imply PROT_EXEC?
*
@@ -1281,9 +1284,6 @@ unsigned long do_mmap_pgoff(struct file
if (!(file && (file->f_path.mnt->mnt_flags & MNT_NOEXEC)))
prot |= PROT_EXEC;
- if (!len)
- return -EINVAL;
-
if (!(flags & MAP_FIXED))
addr = round_hint_to_min(addr);
_
Patches currently in -mm which might be from kwapulinski.piotr@xxxxxxxxx are
mm-mmapc-optimization-of-do_mmap_pgoff-function.patch
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