diff options
Diffstat (limited to 'arch/powerpc/lib/feature-fixups.c')
| -rw-r--r-- | arch/powerpc/lib/feature-fixups.c | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c index defb2998b818..74145f02ad41 100644 --- a/arch/powerpc/lib/feature-fixups.c +++ b/arch/powerpc/lib/feature-fixups.c @@ -13,6 +13,7 @@ */ #include <linux/types.h> +#include <linux/jump_label.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/init.h> @@ -152,9 +153,18 @@ static void do_final_fixups(void) #endif } -void apply_feature_fixups(void) +static unsigned long __initdata saved_cpu_features; +static unsigned int __initdata saved_mmu_features; +#ifdef CONFIG_PPC64 +static unsigned long __initdata saved_firmware_features; +#endif + +void __init apply_feature_fixups(void) { - struct cpu_spec *spec = *PTRRELOC(&cur_cpu_spec); + struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec)); + + *PTRRELOC(&saved_cpu_features) = spec->cpu_features; + *PTRRELOC(&saved_mmu_features) = spec->mmu_features; /* * Apply the CPU-specific and firmware specific fixups to kernel text @@ -173,11 +183,36 @@ void apply_feature_fixups(void) PTRRELOC(&__stop___lwsync_fixup)); #ifdef CONFIG_PPC64 + saved_firmware_features = powerpc_firmware_features; do_feature_fixups(powerpc_firmware_features, &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); #endif do_final_fixups(); + + /* + * Initialise jump label. This causes all the cpu/mmu_has_feature() + * checks to take on their correct polarity based on the current set of + * CPU/MMU features. + */ + jump_label_init(); + cpu_feature_keys_init(); + mmu_feature_keys_init(); +} + +static int __init check_features(void) +{ + WARN(saved_cpu_features != cur_cpu_spec->cpu_features, + "CPU features changed after feature patching!\n"); + WARN(saved_mmu_features != cur_cpu_spec->mmu_features, + "MMU features changed after feature patching!\n"); +#ifdef CONFIG_PPC64 + WARN(saved_firmware_features != powerpc_firmware_features, + "Firmware features changed after feature patching!\n"); +#endif + + return 0; } +late_initcall(check_features); #ifdef CONFIG_FTR_FIXUP_SELFTEST |