On Wed, 19 Sep 2007, Balbir Singh wrote:
> Yes, the whole code is very interesting. From add_to_page_cache()
> we call radix_tree_preload with __GFP_HIGHMEM cleared, but
> from __add_to_swap_cache(), we don't make any changes to the
> gfp_mask. radix_tree_preload() calls kmem_cache_alloc() and in slub
> there is a check
>
> BUG_ON(flags & GFP_SLAB_BUG_MASK);
>
> So, I guess all our allocations should check against __GFP_DMA and
> __GFP_HIGHMEM. I'll review the code, test it and send a fix.
You need to use the proper mask from include/linux/gfp.h. Masking
individual bits will create problems when we create new bits.
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