speed up madvise_need_mmap_write() usage

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Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f7977793240d836e60ff413e94e6914f08e10941
Commit:     f7977793240d836e60ff413e94e6914f08e10941
Parent:     897e679b17460b52752a038af29db356fe1bd759
Author:     Jason Baron <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 15 23:38:21 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Mon Jul 16 09:05:36 2007 -0700

    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 <[EMAIL PROTECTED]>
    Cc: Nishanth Aravamudan <[EMAIL PROTECTED]>
    Cc: Christoph Hellwig <[EMAIL PROTECTED]>
    Cc: Nick Piggin <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 mm/madvise.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

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 @@ 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);
-
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