diff options
Diffstat (limited to 'arch/arm64/kernel/suspend.c')
| -rw-r--r-- | arch/arm64/kernel/suspend.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/arm64/kernel/suspend.c b/arch/arm64/kernel/suspend.c index 0fbdf5fe64d8..eca4d0435211 100644 --- a/arch/arm64/kernel/suspend.c +++ b/arch/arm64/kernel/suspend.c @@ -55,13 +55,13 @@ void notrace __cpu_suspend_exit(void) /* Restore CnP bit in TTBR1_EL1 */ if (system_supports_cnp()) - cpu_replace_ttbr1(lm_alias(swapper_pg_dir), idmap_pg_dir); + cpu_enable_swapper_cnp(); /* * PSTATE was not saved over suspend/resume, re-enable any detected * features that might not have been set correctly. */ - if (cpus_have_const_cap(ARM64_HAS_DIT)) + if (alternative_has_cap_unlikely(ARM64_HAS_DIT)) set_pstate_dit(1); __uaccess_enable_hw_pan(); @@ -98,6 +98,15 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)) struct sleep_stack_data state; struct arm_cpuidle_irq_context context; + /* + * Some portions of CPU state (e.g. PSTATE.{PAN,DIT}) are initialized + * before alternatives are patched, but are only restored by + * __cpu_suspend_exit() after alternatives are patched. To avoid + * accidentally losing these bits we must not attempt to suspend until + * after alternatives have been patched. + */ + WARN_ON(!system_capabilities_finalized()); + /* Report any MTE async fault before going to suspend */ mte_suspend_enter(); |