Linux 6.4 brings major performance improvements and updates for various file systems and hardware.

Linus Torvalds has written new code for the Linux 6.4 kernel, focusing on cleaning up the x86 memory copy code, particularly for user accesses. The code replaces legacy markers with modern markers for micro-architectural support, improving memory copying and clearing. The update is mostly about user memory accesses, as in-kernel cases are done by the compiler. The Linux 6.4 merge window remains open for more feature code.