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In vm_page_ps_test(), always check that the base pages within the specified

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superpage all belong to the same object.  To date, that check has not been
needed, but upcoming changes require it.  (See the Differential Revision.)

Reviewed by:	kib, markj
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D11556
This commit is contained in:
Alan Cox 2017-07-23 05:54:56 +00:00
parent 4e64c62564
commit 1d3b9818e7
1 changed files with 6 additions and 1 deletions
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7
sys/vm/vm_page.c
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@ -3478,9 +3478,11 @@ vm_page_is_valid(vm_page_t m, int base, int size)
bool
vm_page_ps_test(vm_page_t m, int flags, vm_page_t skip_m)
{
vm_object_t object;
int i, npages;
VM_OBJECT_ASSERT_LOCKED(m->object);
object = m->object;
VM_OBJECT_ASSERT_LOCKED(object);
npages = atop(pagesizes[m->psind]);
/*
@ -3489,6 +3491,9 @@ vm_page_ps_test(vm_page_t m, int flags, vm_page_t skip_m)
* occupy adjacent entries in vm_page_array[].
*/
for (i = 0; i < npages; i++) {
/* Always test object consistency, including "skip_m". */
if (m[i].object != object)
return (false);
if (&m[i] == skip_m)
continue;
if ((flags & PS_NONE_BUSY) != 0 && vm_page_busied(&m[i]))