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>

path: root/tstamping.h

#ifndef TSTAMPING_H
#define TSTAMPING_H

#include "config.h"

#ifdef HAVE_HARDWARE_TIMESTAMPING
extern int set_sockopt_hwtimestamp(int sock, const char *dev);
#else
static inline int set_sockopt_hwtimestamp(int sock, const char *dev)
{
	return -1;
}
#endif

#endif /* TSTAMPING_H */