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Acquire the page queues lock in pmap_insert_entry(). (I used to believe

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that the page's busy flag could be relied upon to synchronize access to the
pv list.  I don't any longer.  See, for example, the call to
pmap_insert_entry() from pmap_copy().)
This commit is contained in:
Alan Cox 2003-08-06 18:46:47 +00:00
parent 887dd1d910
commit b0b2803a3b
1 changed files with 2 additions and 0 deletions
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2
sys/i386/i386/pmap.c
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@ -1592,6 +1592,7 @@ pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t mpte, vm_page_t m)
pv_entry_t pv;
s = splvm();
vm_page_lock_queues();
pv = get_pv_entry();
pv->pv_va = va;
pv->pv_pmap = pmap;
@ -1601,6 +1602,7 @@ pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t mpte, vm_page_t m)
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count++;
vm_page_unlock_queues();
splx(s);
}