powerpc/mm/hugetlb: Don't panic when we don't find the default huge page size

The generic hugetlbfs code can handle not finding the default huge page
size correctly. With HPAGE_SHIFT = 0 we see in dmesg:

  hugetlbfs: disabling because there are no supported hugepage sizes

bash-4.2# echo 30 > /proc/sys/vm/nr_hugepages
bash: echo: write error: Operation not supported

Fixes: 03bb2d65900c ("powerpc: get hugetlbpage handling more generic")
Reported-by: Chris Smart <chris@distroguy.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index f21f6b907d99dbc86d47c6608bf76b4bdd3e4a77..8797df11c51f6b08d34ad2c11cec9778652a788e 100644 (file)
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -848,9 +848,6 @@ static int __init hugetlbpage_init(void)
        else if (mmu_psize_defs[MMU_PAGE_2M].shift)
                HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_2M].shift;
 #endif
-       else
-               panic("%s: Unable to set default huge page size\n", __func__);
-
        return 0;
 }