diff mbox series

[23/30] x86/cpu/topology: Simplify cpu_mark_primary_thread()

Message ID 20240213210252.791176581@linutronix.de
State New
Headers
Series x86/apic: Rework APIC registration |

Commit Message

Thomas Gleixner Feb. 13, 2024, 9:06 p.m. UTC 
  From: Thomas Gleixner <tglx@linutronix.de>

No point in creating a mask via fls(). smp_num_siblings is guaranteed to be
a power of 2. So just using (smp_num_siblings - 1) has the same effect.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>




---
 arch/x86/kernel/cpu/topology.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff mbox series

Patch

--- a/arch/x86/kernel/cpu/topology.c
+++ b/arch/x86/kernel/cpu/topology.c
@@ -76,10 +76,7 @@  bool arch_match_cpu_phys_id(int cpu, u64
 #ifdef CONFIG_SMP
 static void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid)
 {
-	/* Isolate the SMT bit(s) in the APICID and check for 0 */
-	u32 mask = (1U << (fls(smp_num_siblings) - 1)) - 1;
-
-	if (smp_num_siblings == 1 || !(apicid & mask))
+	if (!(apicid & (smp_num_siblings - 1)))
 		cpumask_set_cpu(cpu, &__cpu_primary_thread_mask);
 }
 #else