Messages in this thread | | | Date | Sat, 8 Jul 2006 17:07:03 -0700 | From | Marc Singer <> | Subject | DMA memory, split_page, BUG_ON(PageCompound()), sound |
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I'm investigating why I am triggering a BUG_ON in split_page() when I use the sound subsystems dma memory allocation aide.
The crux of the problem appears to be that snd_malloc_dev_pages() passes __GFP_COMP into dma_alloc_coherent(). On the ARM and several other architectures, the dma allocation code calls split_page () with pages allocated with this flag which, in turn, triggers the BUG_ON() check for the CompoundPage flag.
So, the questions are these: Who is doing the wrong thing? Should the snd_malloc_dev_pages() call drop the __GFP_COMP flag? Should split_page() allow the page to be compound? Should __GFP_COMP be 0 on ARM and other architectures that don't support compound pages?
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