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x86/cpu/topology: Simplify cpu_mark_primary_thread()

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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>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Link: https://lore.kernel.org/r/20240213210252.791176581@linutronix.de
This commit is contained in:
Thomas Gleixner
2024-02-13 22:06:06 +01:00
parent 882e0cff9e
commit 5e40fb2d4a
1 changed files with 1 additions and 4 deletions
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5
arch/x86/kernel/cpu/topology.c
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@@ -76,10 +76,7 @@ bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
#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