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Add assertions in two places where a page's valid or dirty bits are changed.

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alc 2009-05-30 22:06:58 +00:00
parent c3ba7754cd
commit e4bf0af67f
1 changed files with 10 additions and 0 deletions
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10
sys/vm/vm_page.c
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@ -566,10 +566,13 @@ vm_page_sleep(vm_page_t m, const char *msg)
void
vm_page_dirty(vm_page_t m)
{
KASSERT((m->flags & PG_CACHED) == 0,
("vm_page_dirty: page in cache!"));
KASSERT(!VM_PAGE_IS_FREE(m),
("vm_page_dirty: page is free!"));
KASSERT(m->valid == VM_PAGE_BITS_ALL,
("vm_page_dirty: page is invalid!"));
m->dirty = VM_PAGE_BITS_ALL;
}
@ -1890,6 +1893,13 @@ vm_page_set_valid(vm_page_t m, int base, int size)
pmap_zero_page_area(m, endoff,
DEV_BSIZE - (endoff & (DEV_BSIZE - 1)));
/*
* Assert that no previously invalid block that is now being validated
* is already dirty.
*/
KASSERT((~m->valid & vm_page_bits(base, size) & m->dirty) == 0,
("vm_page_set_valid: page %p is dirty", m));
/*
* Set valid bits inclusive of any overlap.
*/