tree 8a3e3022c084f7c7c1eebc494a1b94f0ee0d5cae
parent 194dc870a5890e855ecffb30f3b80ba7c88f96d6
parent 703b5faf22fbddf984a361e6555f3a03fdba63d9
author Linus Torvalds <torvalds@linux-foundation.org> 1469733991 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1469733991 -0700

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