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Use membar_{producer,consumer}() to ensure proper access to the "ready"

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pgoyette 2017-01-10 22:08:14 +00:00
parent e56dac4e35
commit 4869ce0a43
1 changed files with 5 additions and 2 deletions
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7
sys/kern/kern_history.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_history.c,v 1.13 2017/01/10 00:50:57 pgoyette Exp $ */
/* $NetBSD: kern_history.c,v 1.14 2017/01/10 22:08:14 pgoyette Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -33,7 +33,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_history.c,v 1.13 2017/01/10 00:50:57 pgoyette Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_history.c,v 1.14 2017/01/10 22:08:14 pgoyette Exp $");
#include "opt_ddb.h"
#include "opt_kernhist.h"
@ -43,6 +43,7 @@ __KERNEL_RCSID(0, "$NetBSD: kern_history.c,v 1.13 2017/01/10 00:50:57 pgoyette E
#include "opt_biohist.h"
#include "opt_sysctl.h"
#include <sys/atomic.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cpu.h>
@ -289,6 +290,7 @@ sysctl_kernhist_new(struct kern_history *hist)
struct kern_history *h;
const struct sysctlnode *rnode = NULL;
membar_consumer();
if (kernhist_sysctl_ready == 0)
return;
@ -329,6 +331,7 @@ sysctl_kernhist_init(void)
sysctl_hist_node = rnode->sysctl_num;
kernhist_sysctl_ready = 1;
membar_producer();
sysctl_kernhist_new(NULL);
}