Author: kib
Date: Sun Jun 23 11:09:08 2019
New Revision: 349304
URL: https://svnweb.freebsd.org/changeset/base/349304
Log:
MFC r348802:
Remove lazy FPU switch support from amd64.
For the merge, the hw.lazy_fpu_switch sysctl was kept but made read-only
with the value of 0.
Modified:
stable/12/sys/amd64/amd64/fpu.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/amd64/amd64/fpu.c
==============================================================================
--- stable/12/sys/amd64/amd64/fpu.c Sun Jun 23 11:04:34 2019
(r349303)
+++ stable/12/sys/amd64/amd64/fpu.c Sun Jun 23 11:09:08 2019
(r349304)
@@ -155,7 +155,7 @@ SYSCTL_INT(_hw, HW_FLOATINGPT, floatingpoint, CTLFLAG_
SYSCTL_NULL_INT_PTR, 1, "Floating point instructions executed in
hardware");
int lazy_fpu_switch = 0;
-SYSCTL_INT(_hw, OID_AUTO, lazy_fpu_switch, CTLFLAG_RWTUN | CTLFLAG_NOFETCH,
+SYSCTL_INT(_hw, OID_AUTO, lazy_fpu_switch, CTLFLAG_RD,
&lazy_fpu_switch, 0,
"Lazily load FPU context after context switch");
@@ -269,7 +269,6 @@ fpuinit_bsp1(void)
uint64_t xsave_mask_user;
bool old_wp;
- TUNABLE_INT_FETCH("hw.lazy_fpu_switch", &lazy_fpu_switch);
if (!use_xsave)
return;
cpuid_count(0xd, 0x0, cp);
@@ -774,8 +773,7 @@ void
fpu_activate_sw(struct thread *td)
{
- if (lazy_fpu_switch || (td->td_pflags & TDP_KTHREAD) != 0 ||
- !PCB_USER_FPU(td->td_pcb)) {
+ if ((td->td_pflags & TDP_KTHREAD) != 0 || !PCB_USER_FPU(td->td_pcb)) {
PCPU_SET(fpcurthread, NULL);
start_emulating();
} else if (PCPU_GET(fpcurthread) != td) {
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