On Tue, Feb 07, 2017 at 09:40:04AM +0000, David Howells wrote: > Matthew Wilcox <wi...@infradead.org> wrote: > > > [adding linux-arch to see if anyone there wants to do an optimised > > version of memfill for their CPU] > > For mn10300, this is superfluous since the memset() implementation will do > optimised filling of up to 8 x 4 bytes per loop if the alignments suit. > > This is also superfluous for frv as that will do up to 8 x 8 bytes per loop. > > So on both those arches, memfill() should probably just wrap memset().
You've misunderstood the purpose of memfill. memfill allows the caller to specify a pattern which is not a single byte in size, eg memfill(addr, 0x12345678, 64) would result in 0x12345678 being reproduced 16 times. memset(addr, 0x12345678, 64) would result in 0x78 being reproduced 64 times.
