Re: [PATCH v4 2/2] powerpc/uaccess: Implement unsafe_copy_to_user() as a simple loop

On Fri, 2020-04-17 at 17:08:52 UTC, Christophe Leroy wrote: > At the time being, unsafe_copy_to_user() is based on > raw_copy_to_user() which calls __copy_tofrom_user(). > > __copy_tofrom_user() is a big optimised function to copy big amount > of data. It aligns destinations to cache line in

[PATCH v4 2/2] powerpc/uaccess: Implement unsafe_copy_to_user() as a simple loop

At the time being, unsafe_copy_to_user() is based on raw_copy_to_user() which calls __copy_tofrom_user(). __copy_tofrom_user() is a big optimised function to copy big amount of data. It aligns destinations to cache line in order to use dcbz instruction. Today unsafe_copy_to_user() is called only