Re: [RFC PATCH v1 9/9] uaccess: Convert small fixed size copy_{to/from}_user() to scoped user access
Yury Norov <[email protected]> Mon, 27 Apr 2026 16:12:55 -0400
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| Message-ID | <ae_DR6NYwy05mhAe@yury> |
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) <[email protected]>
> ---
> 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?