[RFC PATCH v1 9/9] uaccess: Convert small fixed size copy_{to/from}_user() to scoped user access

[Yury Norov]

On Mon, Apr 27, 2026 at 07:13:50PM +0200, Christophe Leroy (CS GROUP) wrote:
> copy_{to/from}_user() is a heavy function optimised for copy of large
> blocs of memory between user and kernel space.
> 
> When the number of bytes to be copied is known at build time and small,
> using scoped user access removes the burden of that optimisation.
> 
> Signed-off-by: Christophe Leroy (CS GROUP) <chleroy at kernel.org>
> ---
>  include/linux/uaccess.h | 47 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
> index 33b7d0f5f808..3ac544527af2 100644
> --- a/include/linux/uaccess.h
> +++ b/include/linux/uaccess.h
> @@ -50,6 +50,8 @@
>   #define mask_user_address(src) (src)
>  #endif
>  
> +#define SMALL_COPY_USER		64

Let's make it L1_CACHE_BYTES, and maybe configurable?