Arnd Bergmann wrote: > Not sure exactly what arm does here, but it sounds like you want > to call remap_pfn_range with the _PAGE_NO_CACHE bit set in the > protection flags, and _PAGE_GUARDED not set.
I always have a hard time with these mapping functions. Is this right? vma->vm_page_prot = __pgprot((pgprot_val(vma->vm_page_prot) | _PAGE_NO_CACHE) & ~_PAGE_GUARDED)); ret = remap_pfn_range(vma, vma->vm_start, runtime->dma_addr, runtime->dma_bytes, vma->vm_page_prot); Alternatively, could I use function snd_pcm_lib_mmap_iomem() (sound/core/pcm_native.c)? It looks like it does the right thing, although it doesn't unset the guarded bit. If that's wrong, I can submit a patch to unset that bit on PowerPC, but like I said, I can never quite get my head around this mapping stuff. -- Timur Tabi Linux Kernel Developer @ Freescale _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
