speed up madvise_need_mmap_write() usage
In the new madvise_need_mmap_write() call we can avoid an extra case
statement and function call as follows.
Signed-off-by: Jason Baron <jbaron@redhat.com>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/madvise.c b/mm/madvise.c
index 60542d0..93ee375 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -287,9 +287,11 @@
struct vm_area_struct * vma, *prev;
int unmapped_error = 0;
int error = -EINVAL;
+ int write;
size_t len;
- if (madvise_need_mmap_write(behavior))
+ write = madvise_need_mmap_write(behavior);
+ if (write)
down_write(¤t->mm->mmap_sem);
else
down_read(¤t->mm->mmap_sem);
@@ -354,7 +356,7 @@
vma = find_vma(current->mm, start);
}
out:
- if (madvise_need_mmap_write(behavior))
+ if (write)
up_write(¤t->mm->mmap_sem);
else
up_read(¤t->mm->mmap_sem);