2018-01-24 19:10 GMT+08:00 Arnd Bergmann <arnd@xxxxxxxx>: > On Wed, Jan 24, 2018 at 12:09 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote: >> On Wed, Jan 24, 2018 at 11:53 AM, Vincent Chen <deanbo422@xxxxxxxxx> wrote: >>> 2018-01-18 18:14 GMT+08:00 Arnd Bergmann <arnd@xxxxxxxx>: > >> Ok. I still wonder about the kernel part of this though: is it a good idea >> for user space to configure whether the kernel does unaligned >> accesses? I would think that the kernel should just be fixed in such >> a case. > > To clarify: I'm asking only about unaligned accesses from kernel code itself, > which is generally considered a bug when > CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is disabled. > > Arnd Thanks for your comments. For performance, we decide always disable CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS even if hardware supports unaligned accessing. Therefore, I will remove kernel unaligned accessing from nds32/mm/alignment.c. In other words, alignment.c only addresses unaligned accessing for user space. Vincent
