Re: [RFC][PATCH] <linux/stringhash.h>: fix end_name_hash() for 64bit long

[Linus Torvalds]

On Mon, Feb 5, 2018 at 9:32 AM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:
>
> Assuming the fix is not moronic, I wouldn't even know where to begin testing
> its affects, or how to prove if there really is a problem.
> Any suggestions?

So I *think* that this was on purpose, but it's a long time ago, and
we've changed some of the hashing since.

And I think you're wrong that it's a no-op on 32-bit. It's a very
expensive and pointless multiplication there too, even if the *shift*
ends up being a nop-op.

The name hashing is pretty performance-sensitive.

                Linus