On Sat, 7 Jun 2025 13:37:42 +0200
Christophe Leroy <christophe.le...@csgroup.eu> wrote:
> With user access protection (Called SMAP on x86 or KUAP on powerpc)
> each and every call to get_user() or put_user() performs heavy
> operations to unlock and lock kernel access to userspace.
>
> To avoid that, perform user accesses by blocks using
> user_access_begin/user_access_end() and unsafe_get_user()/
> unsafe_put_user() and alike.
Did you consider using masked_user_access_begin() ?
It removes a conditional branch and lfence as well.
David
