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fs: Remove unlikely() from fget_light()

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There's an unlikely() in fget_light() that assumes the file ref count
will be 1. Running the annotate branch profiler on a desktop that is
performing daily tasks (running firefox, evolution, xchat and is also part
of a distcc farm), it shows that the ref count is not 1 that often.

 correct incorrect      %    Function                  File              Line
 ------- ---------      -    --------                  ----              ----
1035099358 6209599193  85    fget_light              file_table.c         315

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Steven Rostedt 2010-12-13 19:38:09 -05:00 committed by Al Viro
parent c2b3e74b78
commit 3bc0ba4305
1 changed files with 1 additions and 1 deletions
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2
fs/file_table.c
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@ -311,7 +311,7 @@ struct file *fget_light(unsigned int fd, int *fput_needed)
struct files_struct *files = current->files; struct files_struct *files = current->files;
*fput_needed = 0; *fput_needed = 0;
if (likely((atomic_read(&files->count) == 1))) { if (atomic_read(&files->count) == 1) {
file = fcheck_files(files, fd); file = fcheck_files(files, fd);
} else { } else {
rcu_read_lock(); rcu_read_lock();