powerpc/mm: Add some debug output when hash insertion fails
This adds some debug output to our MMU hash code to print out some
useful debug data if the hypervisor refuses the insertion (which
should normally never happen).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
diff --git a/arch/powerpc/mm/hugetlbpage-hash64.c b/arch/powerpc/mm/hugetlbpage-hash64.c
index faae9ec..cc5c273 100644
--- a/arch/powerpc/mm/hugetlbpage-hash64.c
+++ b/arch/powerpc/mm/hugetlbpage-hash64.c
@@ -127,6 +127,8 @@
*/
if (unlikely(slot == -2)) {
*ptep = __pte(old_pte);
+ hash_failure_debug(ea, access, vsid, trap, ssize,
+ mmu_psize, old_pte);
return -1;
}
