From d957fb4d173647640a2b83e7c7e56a580e7fc7e7 Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Wed, 24 May 2017 17:03:26 +1000 Subject: powerpc: Fix booting P9 hash with CONFIG_PPC_RADIX_MMU=N Currently if you disable CONFIG_PPC_RADIX_MMU you'll crash on boot on a P9. This is because we still set MMU_FTR_TYPE_RADIX via ibm,pa-features and MMU_FTR_TYPE_RADIX is what's used for code patching in much of the asm code (ie. slb_miss_realmode) This patch fixes the problem by stopping MMU_FTR_TYPE_RADIX from being set from ibm.pa-features. We may eventually end up removing the CONFIG_PPC_RADIX_MMU option completely but until then this fixes the issue. Fixes: 17a3dd2f5fc7 ("powerpc/mm/radix: Use firmware feature to enable Radix MMU") Cc: stable@vger.kernel.org # v4.7+ Signed-off-by: Michael Neuling Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/prom.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch') diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 40c4887c27b6..f83056297441 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -161,7 +161,9 @@ static struct ibm_pa_feature { { .pabyte = 0, .pabit = 3, .cpu_features = CPU_FTR_CTRL }, { .pabyte = 0, .pabit = 6, .cpu_features = CPU_FTR_NOEXECUTE }, { .pabyte = 1, .pabit = 2, .mmu_features = MMU_FTR_CI_LARGE_PAGE }, +#ifdef CONFIG_PPC_RADIX_MMU { .pabyte = 40, .pabit = 0, .mmu_features = MMU_FTR_TYPE_RADIX }, +#endif { .pabyte = 1, .pabit = 1, .invert = 1, .cpu_features = CPU_FTR_NODSISRALIGN }, { .pabyte = 5, .pabit = 0, .cpu_features = CPU_FTR_REAL_LE, .cpu_user_ftrs = PPC_FEATURE_TRUE_LE }, -- cgit v1.2.3