svn commit: r355263 - stable/12/sys/amd64/include

[Konstantin Belousov]

Author: kib
Date: Sun Dec  1 16:02:15 2019
New Revision: 355263
URL: https://svnweb.freebsd.org/changeset/base/355263

Log:
  MFC r355060:
  amd64: assert that EARLY_COUNTER does not corrupt memory.

Modified:
  stable/12/sys/amd64/include/counter.h
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/amd64/include/counter.h
==============================================================================
--- stable/12/sys/amd64/include/counter.h	Sun Dec  1 15:59:04 2019	(r355262)
+++ stable/12/sys/amd64/include/counter.h	Sun Dec  1 16:02:15 2019	(r355263)
@@ -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)