Should we be using unlikely() around tests of GFP_ZERO?

[Theodore Ts'o]

Given the patches being busily submitted by trivial patch submitters to
make use kmem_cache_zalloc(), et. al, I believe we should remove the
unlikely() tests around the (gfp_flags & __GFP_ZERO) tests, such as:

-	if (unlikely((flags & __GFP_ZERO) && objp))
+	if ((flags & __GFP_ZERO) && objp)
		memset(objp, 0, obj_size(cachep));

Agreed?  If so, I'll send a patch...

	    					- Ted
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