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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>
This commit is contained in:
Jason Baron 2007-07-15 23:38:21 -07:00 committed by Linus Torvalds
parent 897e679b17
commit f797779324
1 changed files with 4 additions and 2 deletions
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6
mm/madvise.c
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@ -287,9 +287,11 @@ asmlinkage long sys_madvise(unsigned long start, size_t len_in, int behavior)
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(&current->mm->mmap_sem);
else
down_read(&current->mm->mmap_sem);
@ -354,7 +356,7 @@ asmlinkage long sys_madvise(unsigned long start, size_t len_in, int behavior)
vma = find_vma(current->mm, start);
}
out:
if (madvise_need_mmap_write(behavior))
if (write)
up_write(&current->mm->mmap_sem);
else
up_read(&current->mm->mmap_sem);