On Mon, 23 Jul 2007, Andrew Morton wrote:
> So this:
>
> /*
> * Be lazy and only check for valid flags here, keeping it out of the
> * critical path in kmem_cache_alloc().
> */
> BUG_ON(flags & ~(GFP_DMA | __GFP_ZERO | GFP_LEVEL_MASK));
>
> would no longer need the __GFP_ZERO. Ditto in slob's new_slab().
That __GFP_ZERO is needed to avoid triggering the BUG_ON. The next line
local_flags = (flags & GFP_LEVEL_MASK);
filters out the __GFP_ZERO before calling the page allocator.
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