powerpc/64/kexec: Fix MMU cleanup on radix

[cascardo/linux.git] / arch / powerpc / mm / init_64.c

diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 33709bd..16ada1e 100644 (file)
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -411,3 +411,25 @@ struct page *realmode_pfn_to_page(unsigned long pfn)
 EXPORT_SYMBOL_GPL(realmode_pfn_to_page);
 
 #endif /* CONFIG_SPARSEMEM_VMEMMAP/CONFIG_FLATMEM */
+
+#ifdef CONFIG_PPC_STD_MMU_64
+static bool disable_radix;
+static int __init parse_disable_radix(char *p)
+{
+       disable_radix = true;
+       return 0;
+}
+early_param("disable_radix", parse_disable_radix);
+
+void __init mmu_early_init_devtree(void)
+{
+       /* Disable radix mode based on kernel command line. */
+       if (disable_radix)
+               cur_cpu_spec->mmu_features &= ~MMU_FTR_TYPE_RADIX;
+
+       if (early_radix_enabled())
+               radix__early_init_devtree();
+       else
+               hash__early_init_devtree();
+}
+#endif /* CONFIG_PPC_STD_MMU_64 */