Re: [PATCH] arm64: uaccess: Optimize copy_to/from_user with LSUI extension

From: Catalin Marinas

Date: Fri Aug 07 2026 - 12:56:24 EST


On Wed, Aug 05, 2026 at 11:52:51AM +0800, Qinxin Xia wrote:
> Add support for the ARMv9.6/LSUI (Load/Store Unprivileged Immediate)
> extension to optimize copy_from_user operations. The implementation
> uses the alternative mechanism to select between the standard unprivileged
> load-pair sequence and the new ldtp/sttp instruction at runtime based on
> hardware capability.

That's all good but do you have any numbers to back the change up?

--
Catalin