On Thu, 21 Jun 2007, Hugh Dickins wrote: > > The oops seems to occur after a page unmapping using dma_unmap_page() > > followed > > by a flush_dcache_page() (in at91mci_post_dma_read()).
Was the page allocated using slab calls? > Seems a little odd that it's gone throughout 2.6.22-rc unnoticed > until now - nobody else trying SLUB on ARM or PA-RISC yet perhaps. > As I understand it, you're not doing anything wrong (disclaimer: > I'm no expert on dma_mapping things), but SLUB's reuse of struct > page fields has collided with what flush_dcache_page is expecting. > > Here's a patch: I'm not convinced it's necessarily the best one > (most uses of page_mapping will never see a slab page, it's a pity > to be cluttering up that inline even further); but in case nobody > else can provide a better... Well one may be better off allocating pages using the page allocator instead of the slab allocator. I removed these things from i386 but I did not check ARM. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
