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Assert that page is VPO_BUSY or page owner object is locked in

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vm_page_undirty(). The assert is not precise due to VPO_BUSY owner
to tracked, so assertion does not catch the case when VPO_BUSY is
owned by other thread.

Reviewed by:	alc
This commit is contained in:
Konstantin Belousov 2011-06-11 20:15:19 +00:00
parent 9d17da3bef
commit 3b1025d200
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=222992
2 changed files with 26 additions and 0 deletions
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17
sys/vm/vm_page.c
View File

@ -2636,6 +2636,23 @@ vm_page_cowsetup(vm_page_t m)
return (0);
}
#ifdef INVARIANTS
void
vm_page_object_lock_assert(vm_page_t m)
{
/*
* Certain of the page's fields may only be modified by the
* holder of the containing object's lock or the setter of the
* page's VPO_BUSY flag. Unfortunately, the setter of the
* VPO_BUSY flag is not recorded, and thus cannot be checked
* here.
*/
if (m->object != NULL && (m->oflags & VPO_BUSY) == 0)
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
}
#endif
#include "opt_ddb.h"
#ifdef DDB
#include <sys/kernel.h>

9
sys/vm/vm_page.h
View File

@ -383,6 +383,13 @@ void vm_page_cowfault (vm_page_t);
int vm_page_cowsetup(vm_page_t);
void vm_page_cowclear (vm_page_t);
#ifdef INVARIANTS
void vm_page_object_lock_assert(vm_page_t m);
#define VM_PAGE_OBJECT_LOCK_ASSERT(m) vm_page_object_lock_assert(m)
#else
#define VM_PAGE_OBJECT_LOCK_ASSERT(m) (void)0
#endif
/*
* vm_page_sleep_if_busy:
*
@ -412,6 +419,8 @@ vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg)
static __inline void
vm_page_undirty(vm_page_t m)
{
VM_PAGE_OBJECT_LOCK_ASSERT(m);
m->dirty = 0;
}