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x86/apic: Annotate global config variables as "read-only after init" 

Mark the APIC's global config variables that are constant after boot as
__ro_after_init to help document that the majority of the APIC config is
not changed at runtime, and to harden the kernel a smidge.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190805212134.12001-1-sean.j.christopherson@intel.com
This commit is contained in:
Sean Christopherson 2019-08-05 14:21:34 -07:00 committed by Thomas Gleixner
parent 43931d350f
commit 6444b40eed
1 changed files with 13 additions and 13 deletions
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26
arch/x86/kernel/apic/apic.c
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@ -65,10 +65,10 @@ unsigned int num_processors;
unsigned disabled_cpus;
/* Processor that is doing the boot up */
unsigned int boot_cpu_physical_apicid = -1U;
unsigned int boot_cpu_physical_apicid __ro_after_init = -1U;
EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid);
u8 boot_cpu_apic_version;
u8 boot_cpu_apic_version __ro_after_init;
/*
* The highest APIC ID seen during enumeration.
@ -85,13 +85,13 @@ physid_mask_t phys_cpu_present_map;
* disable_cpu_apicid=<int>, mostly used for the kdump 2nd kernel to
* avoid undefined behaviour caused by sending INIT from AP to BSP.
*/
static unsigned int disabled_cpu_apicid __read_mostly = BAD_APICID;
static unsigned int disabled_cpu_apicid __ro_after_init = BAD_APICID;
/*
* This variable controls which CPUs receive external NMIs. By default,
* external NMIs are delivered only to the BSP.
*/
static int apic_extnmi = APIC_EXTNMI_BSP;
static int apic_extnmi __ro_after_init = APIC_EXTNMI_BSP;
/*
* Map cpu index to physical APIC ID
@ -114,7 +114,7 @@ EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_acpiid);
DEFINE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid, BAD_APICID);
/* Local APIC was disabled by the BIOS and enabled by the kernel */
static int enabled_via_apicbase;
static int enabled_via_apicbase __ro_after_init;
/*
* Handle interrupt mode configuration register (IMCR).
@ -172,23 +172,23 @@ static __init int setup_apicpmtimer(char *s)
__setup("apicpmtimer", setup_apicpmtimer);
#endif
unsigned long mp_lapic_addr;
int disable_apic;
unsigned long mp_lapic_addr __ro_after_init;
int disable_apic __ro_after_init;
/* Disable local APIC timer from the kernel commandline or via dmi quirk */
static int disable_apic_timer __initdata;
/* Local APIC timer works in C2 */
int local_apic_timer_c2_ok;
int local_apic_timer_c2_ok __ro_after_init;
EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
/*
* Debug level, exported for io_apic.c
*/
int apic_verbosity;
int apic_verbosity __ro_after_init;
int pic_mode;
int pic_mode __ro_after_init;
/* Have we found an MP table */
int smp_found_config;
int smp_found_config __ro_after_init;
static struct resource lapic_resource = {
.name = "Local APIC",
@ -199,7 +199,7 @@ unsigned int lapic_timer_period = 0;
static void apic_pm_activate(void);
static unsigned long apic_phys;
static unsigned long apic_phys __ro_after_init;
/*
* Get the LAPIC version
@ -1278,7 +1278,7 @@ void __init sync_Arb_IDs(void)
APIC_INT_LEVELTRIG | APIC_DM_INIT);
}
enum apic_intr_mode_id apic_intr_mode;
enum apic_intr_mode_id apic_intr_mode __ro_after_init;
static int __init apic_intr_mode_select(void)
{