git: 72a42ec63b4a - main - amd64: disable LA57 by default for now

[Konstantin Belousov]

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=72a42ec63b4a98f812f5f6164415eeb9a55e1933

commit 72a42ec63b4a98f812f5f6164415eeb9a55e1933
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-04-28 15:50:16 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-04-30 14:43:45 +0000

    amd64: disable LA57 by default for now
    
    A testing on the real hardware uncovered an issue, and since I do not have
    access to the machine, disable until the bug can be fixed.
    
    Reported by:    "Pieper, Jeffrey E" <jeffrey.e.pieper at intel.com>
    Sponsored by:   The FreeBSD Foundation
    MFC after:      3 days
---
 sys/amd64/amd64/pmap.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index 5a6a1cee8b8c..a4046cc1f687 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -2080,8 +2080,7 @@ pmap_bootstrap_la57(void *arg __unused)
 
 	if ((cpu_stdext_feature2 & CPUID_STDEXT2_LA57) == 0)
 		return;
-	if (!TUNABLE_INT_FETCH("vm.pmap.la57", &la57))
-		la57 = 1;
+	TUNABLE_INT_FETCH("vm.pmap.la57", &la57);
 	if (!la57)
 		return;