On Tue, 15 Sep 2020, Mikulas Patocka wrote: > > > - __copy_from_user_inatomic_nocache doesn't flush cache for leading and > > > trailing bytes. > > > > You want copy_user_flushcache(). See how fs/dax.c arranges for > > dax_copy_from_iter() to route to pmem_copy_from_iter(). > > Is it something new for the kernel 5.10? I see only __copy_user_flushcache > that is implemented just for x86 and arm64. > > There is __copy_from_user_flushcache implemented for x86, arm64 and power. > It is used in lib/iov_iter.c under > #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE - so should I use this? > > Mikulas ... and __copy_user_flushcache is not exported for modules. So, I am stuck with __copy_from_user_inatomic_nocache. Mikulas
