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authorAnton Blanchard <anton@samba.org>2010-07-14 19:31:48 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-07-23 08:44:51 +1000
commitb1623e7eb280f853f60338c7bb68bd3f3a970205 (patch)
tree86b0a532dd3cdd8228f6efbd3067d7b693eb159c /arch
parentb37fa16e78d6f9790462b3181602a26b5af36260 (diff)
downloadlinux-2.6.34-ux500-b1623e7eb280f853f60338c7bb68bd3f3a970205.tar.gz
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/hugetlbpage-hash64.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/powerpc/mm/hugetlbpage-hash64.c b/arch/powerpc/mm/hugetlbpage-hash64.c
index 199539882f9..c9acd7910ee 100644
--- a/arch/powerpc/mm/hugetlbpage-hash64.c
+++ b/arch/powerpc/mm/hugetlbpage-hash64.c
@@ -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);
}