On Tue, Aug 20, 2019 at 08:34:29PM +0800, guoren@xxxxxxxxxx wrote: > From: Guo Ren <ren_guo@xxxxxxxxx> > > We prohibit non-aligned access in kernel mode, but some special NIC > driver needs to support kernel-state unaligned access. For example, > when the bus does not support unaligned access, IP header parsing > will cause non-aligned access and driver does not recopy the skb > buffer to dma for performance reasons. > > Added kernel_enable & user_enable to control unaligned access and > added kernel_count & user_count for statistical unaligned access. If the NIC drivers requires this it is buggy. Kernel code must use the get_unaligned* / put_unaligned* helpers for that.
