svn commit: r355060 - head/sys/amd64/include
Konstantin Belousov
kib at FreeBSD.org
Sun Nov 24 19:02:14 UTC 2019
Author: kib
Date: Sun Nov 24 19:02:13 2019
New Revision: 355060
URL: https://svnweb.freebsd.org/changeset/base/355060
Log:
amd64: assert that EARLY_COUNTER does not corrupt memory.
Reviewed by: imp
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D22514
Modified:
head/sys/amd64/include/counter.h
Modified: head/sys/amd64/include/counter.h
==============================================================================
--- head/sys/amd64/include/counter.h Sun Nov 24 16:40:54 2019 (r355059)
+++ head/sys/amd64/include/counter.h Sun Nov 24 19:02:13 2019 (r355060)
@@ -82,6 +82,7 @@ static inline void
counter_u64_add(counter_u64_t c, int64_t inc)
{
+ KASSERT(IS_BSP() || c != EARLY_COUNTER, ("EARLY_COUNTER used on AP"));
__asm __volatile("addq\t%1,%%gs:(%0)"
:
: "r" ((char *)c - (char *)&__pcpu[0]), "ri" (inc)
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