diff options
| -rw-r--r-- | arch/powerpc/mm/init_64.c | 13 | ||||
| -rw-r--r-- | arch/powerpc/platforms/Kconfig.cputype | 13 |
2 files changed, 24 insertions, 2 deletions
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index 12b3025fadac..a07722531b32 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -368,10 +368,19 @@ EXPORT_SYMBOL_GPL(realmode_pfn_to_page); #endif /* CONFIG_SPARSEMEM_VMEMMAP */ #ifdef CONFIG_PPC_BOOK3S_64 -static bool disable_radix; +static bool disable_radix = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT); + static int __init parse_disable_radix(char *p) { - disable_radix = true; + bool val; + + if (strlen(p) == 0) + val = true; + else if (kstrtobool(p, &val)) + return -EINVAL; + + disable_radix = val; + return 0; } early_param("disable_radix", parse_disable_radix); diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index f8928ee85f6b..596bd9091478 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -304,6 +304,19 @@ config PPC_RADIX_MMU is only implemented by IBM Power9 CPUs, if you don't have one of them you can probably disable this. +config PPC_RADIX_MMU_DEFAULT + bool "Default to using the Radix MMU when possible" + depends on PPC_RADIX_MMU + default y + help + When the hardware supports the Radix MMU, default to using it unless + "disable_radix[=yes]" is specified on the kernel command line. + + If this option is disabled, the Hash MMU will be used by default, + unless "disable_radix=no" is specified on the kernel command line. + + If you're unsure, say Y. + config ARCH_ENABLE_HUGEPAGE_MIGRATION def_bool y depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION |