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powerpc/mm: Handle hypervisor pte insert failure in __hash_page_huge 

If the hypervisor gives us an error on a hugepage insert we panic. The
normal page code already handles this by returning an error instead and we end
calling low_hash_fault which will just kill the task if possible.

The patch below does a similar thing for the hugepage case.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-07-14 19:31:48 +00:00 committed by Benjamin Herrenschmidt
parent b37fa16e78
commit b1623e7eb2
1 changed files with 9 additions and 2 deletions
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11
arch/powerpc/mm/hugetlbpage-hash64.c
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@ -121,8 +121,15 @@ repeat:
}
}
if (unlikely(slot == -2))
panic("hash_huge_page: pte_insert failed\n");
/*
* Hypervisor failure. Restore old pte and return -1
* similar to __hash_page_*
*/
if (unlikely(slot == -2)) {
*ptep = __pte(old_pte);
err = -1;
goto out;
}
new_pte |= (slot << 12) & (_PAGE_F_SECOND | _PAGE_F_GIX);
}