[tip: x86/core] x86/apic: Use BAD_APICID consistently

tip-bot2 for Thomas Gleixner
2023-10-13T09:38:27Z

The following commit has been merged into the x86/core branch of tip:

Commit-ID: 9ff4275bc8fd7bd5ac4677e2724397f8db3209bf
Gitweb: https://git.kernel.org/tip/9ff4275bc8fd7bd5ac4677e2724397f8db3209bf
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 14 Aug 2023 10:18:39 +02:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Tue, 10 Oct 2023 14:38:18 +02:00

x86/apic: Use BAD_APICID consistently

APIC ID checks compare with BAD_APICID all over the place, but some
initializers and some code which fiddles with global data structure use
-1[U] instead. That simply cannot work at all.

Fix it up and use BAD_APICID consistently all over the place.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230814085112.862835121@linutronix.de

---
arch/x86/kernel/acpi/boot.c | 2 +-
arch/x86/kernel/apic/apic.c | 6 ++----
2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 2a0ea38..f3e4d35 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -856,7 +856,7 @@ int acpi_unmap_cpu(int cpu)
set_apicid_to_node(per_cpu(x86_cpu_to_apicid, cpu), NUMA_NO_NODE);
#endif

- per_cpu(x86_cpu_to_apicid, cpu) = -1;
+ per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
set_cpu_present(cpu, false);
num_processors--;

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 3cdf484..d2b1d60 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -72,7 +72,7 @@ unsigned int num_processors;
unsigned disabled_cpus;

/* Processor that is doing the boot up */
-unsigned int boot_cpu_physical_apicid __ro_after_init = -1U;
+unsigned int boot_cpu_physical_apicid __ro_after_init = BAD_APICID;
EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid);

u8 boot_cpu_apic_version __ro_after_init;
@@ -2318,9 +2318,7 @@ static int nr_logical_cpuids = 1;
/*
* Used to store mapping between logical CPU IDs and APIC IDs.
*/
-int cpuid_to_apicid[] = {
- [0 ... NR_CPUS - 1] = -1,
-};
+int cpuid_to_apicid[] = { [0 ... NR_CPUS - 1] = BAD_APICID, };

bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{