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split_large_page(): avoid panic when splitting "non-mapped" large pages

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Balazs Gerofi
2016-07-14 17:11:52 +09:00
parent 6118faffa9
commit 4c8f583c0c
1 changed files with 11 additions and 5 deletions
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16
arch/x86/kernel/memory.c
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@ -910,11 +910,17 @@ static int split_large_page(pte_t *ptep, size_t pgsize)
*ptep = (virt_to_phys(pt) & PT_PHYSMASK) | PFL2_PDIR_ATTR;
if (phys_base != NOPHYS) {
page = phys_to_page(phys_base);
if (page && page_unmap(page)) {
kprintf("split_large_page:page_unmap:%p\n", page);
panic("split_large_page:page_unmap\n");
/* Do not do this check for large pages as they don't come from the zeroobj
* and are not actually mapped.
* TODO: clean up zeroobj as we don't really need it, anonymous mappings
* should be allocated for real */
if (pgsize != PTL2_SIZE) {
if (phys_base != NOPHYS) {
page = phys_to_page(phys_base);
if (pgsize != PTL2_SIZE && page && page_unmap(page)) {
kprintf("split_large_page:page_unmap:%p\n", page);
panic("split_large_page:page_unmap\n");
}
}
}
return 0;