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-rw-r--r--arch/powerpc/mm/pgtable-radix.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 39c252b54d16..cfbbee941a76 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -169,6 +169,16 @@ void radix__mark_rodata_ro(void)
{
unsigned long start, end;
+ /*
+ * mark_rodata_ro() will mark itself as !writable at some point.
+ * Due to DD1 workaround in radix__pte_update(), we'll end up with
+ * an invalid pte and the system will crash quite severly.
+ */
+ if (cpu_has_feature(CPU_FTR_POWER9_DD1)) {
+ pr_warn("Warning: Unable to mark rodata read only on P9 DD1\n");
+ return;
+ }
+
start = (unsigned long)_stext;
end = (unsigned long)__init_begin;