Hi Ard, On Fri, Jan 29, 2016 at 03:17:15PM +0100, Ard Biesheuvel wrote: > Instead of iterating over the PCI config window and performing individual > ioremap() calls on all the adjacent slices, perform a single ioremap() to > map the entire region, and divvy it up later. This not only prevents > leaving some of it mapped if we fail half way through, it also ensures that > archs that support huge-vmap can use section mappings to perform the > mapping. > > On my Seattle A0 box, this transforms 128 separate 1 MB mappings that are > mapped down to 4 KB pages into a single 128 MB mapping using 2 MB sections, > saving 512 KB worth of page tables. > > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> > --- The code was written this way in response to feedback during driver review that we couldn't necessarily grab that much contiguous vmalloc space on 32-bit ARM. Unless that's changed, we probably want to to predicate this change on having a 64-bit arch. Will -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
