From 7353644fa9df875aee778a802e3d28f1e3578512 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Mon, 25 Jul 2016 11:54:41 +1000 Subject: [PATCH] powerpc/mm: Fix build break when PPC_NATIVE=n The recent commit to rework the hash MMU setup broke the build when CONFIG_PPC_NATIVE=n. Fix it by adding an IS_ENABLED() check before calling hpte_init_native(). Removing the else clause opens the possibility that we don't set any ops, which would probably lead to a strange crash later. So add a check that we correctly initialised at least one member of the struct. Fixes: 166dd7d3fbf2 ("powerpc/64: Move MMU backend selection out of platform code") Reported-by: Stephen Rothwell Acked-by: Stephen Rothwell Signed-off-by: Michael Ellerman --- arch/powerpc/mm/hash_utils_64.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 3416324..381b589 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -931,9 +931,12 @@ void __init hash__early_init_mmu(void) ps3_early_mm_init(); else if (firmware_has_feature(FW_FEATURE_LPAR)) hpte_init_lpar(); - else + else if IS_ENABLED(CONFIG_PPC_NATIVE) hpte_init_native(); + if (!mmu_hash_ops.hpte_insert) + panic("hash__early_init_mmu: No MMU hash ops defined!\n"); + /* Initialize the MMU Hash table and create the linear mapping * of memory. Has to be done before SLB initialization as this is * currently where the page size encoding is obtained. -- 2.7.4