CVS commit: src/sys/arch/x86/x86

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Mon Jul 20 16:41:18 UTC 2020

Modified Files:
        src/sys/arch/x86/x86: fpu.c

Log Message:
Save fpu state at IPL_VM to exclude fpu_kern_enter/leave.

This way fpu_kern_enter/leave cannot interrupt the transition, so the
transition from state-on-CPU to state-in-memory (with TS set) is
atomic whether in an interrupt or not.

(I am not 100% convinced that this is necessary, but it makes
reasoning about the transition simpler.)


To generate a diff of this commit:
cvs rdiff -u -r1.70 -r1.71 src/sys/arch/x86/x86/fpu.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.