Linux 7.1 Gets Rid of Some Unnecessary Memory Clobbers

9 hours ago

Linux 7.1 kernel incorporates x86/asm changes with minor improvements, primarily removing unnecessary memory clobbers from inline Assembly code.
Removing memory clobbers can slightly enhance instruction scheduling and register allocation by avoiding read/write memory barriers that prevent compiler reordering and force register flushes.
Two patches were applied: one eliminates a memory clobber from the kernel's FS/GS base accessors (which only read MSRs, not memory), and another removes a clobber from savesegment() for similar reasons.

Hasty Briefsbeta