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From: Bharata B Rao <bharata@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: aneesh.kumar@linux.ibm.com, npiggin@gmail.com,
	Bharata B Rao <bharata@linux.ibm.com>, Qian Cai <cai@lca.pw>
Subject: [FIX PATCH] powerpc/prom: Enable Radix GTSE in cpu pa-features
Date: Mon, 20 Jul 2020 10:12:58 +0530	[thread overview]
Message-ID: <20200720044258.863574-1-bharata@linux.ibm.com> (raw)

From: Nicholas Piggin <npiggin@gmail.com>

When '029ab30b4c0a ("powerpc/mm: Enable radix GTSE only if supported.")'
made GTSE an MMU feature, it was enabled by default in
powerpc-cpu-features but was missed in pa-features. This causes
random memory corruption during boot of PowerNV kernels where
CONFIG_PPC_DT_CPU_FTRS isn't enabled.

Fixes: 029ab30b4c0a ("powerpc/mm: Enable radix GTSE only if supported.")
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
---
 arch/powerpc/kernel/prom.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 9cc49f265c86..a9594bad572a 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -163,7 +163,8 @@ static struct ibm_pa_feature {
 	{ .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 },
+	{ .pabyte = 40, .pabit = 0,
+	  .mmu_features  = (MMU_FTR_TYPE_RADIX | MMU_FTR_GTSE) },
 #endif
 	{ .pabyte = 1,  .pabit = 1, .invert = 1, .cpu_features = CPU_FTR_NODSISRALIGN },
 	{ .pabyte = 5,  .pabit = 0, .cpu_features  = CPU_FTR_REAL_LE,
-- 
2.26.2


             reply	other threads:[~2020-07-20  4:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-20  4:42 Bharata B Rao [this message]
2020-07-20  5:38 ` [FIX PATCH] powerpc/prom: Enable Radix GTSE in cpu pa-features Nicholas Piggin
2020-07-20  6:17   ` Bharata B Rao
2020-07-20 14:14 ` Michael Ellerman

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