Module Name: src
Committed By: maxv
Date: Sat Jun 16 05:52:17 UTC 2018
Modified Files:
src/sys/arch/x86/x86: fpu.c
Log Message:
Actually, don't do anything if we switch to a kernel thread. When the cpu
switches back to a user thread the fpu is restored, so no point calling
fninit (which doesn't clear all the states anyway).
To generate a diff of this commit:
cvs rdiff -u -r1.34 -r1.35 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.
Modified files:
Index: src/sys/arch/x86/x86/fpu.c
diff -u src/sys/arch/x86/x86/fpu.c:1.34 src/sys/arch/x86/x86/fpu.c:1.35
--- src/sys/arch/x86/x86/fpu.c:1.34 Thu Jun 14 18:00:15 2018
+++ src/sys/arch/x86/x86/fpu.c Sat Jun 16 05:52:17 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: fpu.c,v 1.34 2018/06/14 18:00:15 maxv Exp $ */
+/* $NetBSD: fpu.c,v 1.35 2018/06/16 05:52:17 maxv Exp $ */
/*
* Copyright (c) 2008 The NetBSD Foundation, Inc. All
@@ -96,7 +96,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fpu.c,v 1.34 2018/06/14 18:00:15 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fpu.c,v 1.35 2018/06/16 05:52:17 maxv Exp $");
#include "opt_multiprocessor.h"
@@ -333,14 +333,6 @@ fpu_restore(struct lwp *l)
}
static void
-fpu_reset(void)
-{
- clts();
- fninit();
- stts();
-}
-
-static void
fpu_eagerrestore(struct lwp *l)
{
struct pcb *pcb = lwp_getpcb(l);
@@ -359,9 +351,7 @@ fpu_eagerswitch(struct lwp *oldlwp, stru
s = splhigh();
fpusave_cpu(true);
- if (newlwp->l_flag & LW_SYSTEM)
- fpu_reset();
- else
+ if (!(newlwp->l_flag & LW_SYSTEM))
fpu_eagerrestore(newlwp);
splx(s);
}
