Merge branch 'salted-string-hash'

This changes the vfs dentry hashing to mix in the parent pointer at the
_beginning_ of the hash, rather than at the end.

That actually improves both the hash and the code generation, because we
can move more of the computation to the "static" part of the dcache
setup, and do less at lookup runtime.

It turns out that a lot of other hash users also really wanted to mix in
a base pointer as a 'salt' for the hash, and so the slightly extended
interface ends up working well for other cases too.

Users that want a string hash that is purely about the string pass in a
'salt' pointer of NULL.

* merge branch 'salted-string-hash':
  fs/dcache.c: Save one 32-bit multiply in dcache lookup
  vfs: make the string hashes salt the hash

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/sunrpc/svcauth.h b/include/linux/sunrpc/svcauth.h
index 91d5a5d..d039320 100644
--- a/include/linux/sunrpc/svcauth.h
+++ b/include/linux/sunrpc/svcauth.h
@@ -172,12 +172,12 @@ extern void unix_gid_cache_destroy(struct net *net);
  */
 static inline unsigned long hash_str(char const *name, int bits)
 {
-	return hashlen_hash(hashlen_string(name)) >> (32 - bits);
+	return hashlen_hash(hashlen_string(NULL, name)) >> (32 - bits);
 }
 
 static inline unsigned long hash_mem(char const *buf, int length, int bits)
 {
-	return full_name_hash(buf, length) >> (32 - bits);
+	return full_name_hash(NULL, buf, length) >> (32 - bits);
 }
 
 #endif /* __KERNEL__ */