fs: dcache reduce branches in lookup path

Reduce some branches and memory accesses in dcache lookup by adding dentry
flags to indicate common d_ops are set, rather than having to check them.
This saves a pointer memory access (dentry->d_op) in common path lookup
situations, and saves another pointer load and branch in cases where we
have d_op but not the particular operation.

Patched with:

git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index d39d8a53b579..5a24f40bb48e 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2233,7 +2233,7 @@ pfm_alloc_file(pfm_context_t *ctx)
         }
         path.mnt = mntget(pfmfs_mnt);
 
-        path.dentry->d_op = &pfmfs_dentry_operations;
+        d_set_d_op(path.dentry, &pfmfs_dentry_operations);
         d_add(path.dentry, inode);
 
         file = alloc_file(&path, FMODE_READ, &pfm_file_ops);