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x86/apic/32: Avoid bogus LDR warnings

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The removal of the LDR initialization in the bigsmp_32 APIC code unearthed
a problem in setup_local_APIC().

The code checks unconditionally for a mismatch of the logical APIC id by
comparing the early APIC id which was initialized in get_smp_config() with
the actual LDR value in the APIC.

Due to the removal of the bogus LDR initialization the check now can
trigger on bigsmp_32 APIC systems emitting a warning for every booting
CPU. This is of course a false positive because the APIC is not using
logical destination mode.

Restrict the check and the possibly resulting fixup to systems which are
actually using the APIC in logical destination mode.

[ tglx: Massaged changelog and added Cc stable ]

Fixes: bae3a8d330 ("x86/apic: Do not initialize LDR and DFR for bigsmp")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/666d8f91-b5a8-1afd-7add-821e72a35f03@suse.com
This commit is contained in:
Jan Beulich 2019-10-29 10:34:19 +01:00 committed by Thomas Gleixner
parent 26467b0f84
commit fe6f85ca12
1 changed files with 15 additions and 13 deletions
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16
arch/x86/kernel/apic/apic.c
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@ -1586,9 +1586,6 @@ static void setup_local_APIC(void)
{
int cpu = smp_processor_id();
unsigned int value;
#ifdef CONFIG_X86_32
int logical_apicid, ldr_apicid;
#endif
if (disable_apic) {
disable_ioapic_support();
@ -1626,16 +1623,21 @@ static void setup_local_APIC(void)
apic->init_apic_ldr();
#ifdef CONFIG_X86_32
if (apic->dest_logical) {
int logical_apicid, ldr_apicid;
/*
* APIC LDR is initialized. If logical_apicid mapping was
* initialized during get_smp_config(), make sure it matches the
* actual value.
* initialized during get_smp_config(), make sure it matches
* the actual value.
*/
logical_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
ldr_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
WARN_ON(logical_apicid != BAD_APICID && logical_apicid != ldr_apicid);
/* always use the value from LDR */
if (logical_apicid != BAD_APICID)
WARN_ON(logical_apicid != ldr_apicid);
/* Always use the value from LDR. */
early_per_cpu(x86_cpu_to_logical_apicid, cpu) = ldr_apicid;
}
#endif
/*