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| author | Thomas Gleixner <tglx@linutronix.de> | 2024-02-13 22:06:06 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-15 22:07:44 +0100 |
| commit | 5e40fb2d4a4c7503cab4f923b7d985dbcf583581 (patch) | |
| tree | 0e4603206dc66445ad67fb4f33300163f1a60471 /arch/x86/kernel/cpu/topology.c | |
| parent | x86/cpu/topology: Mop up primary thread mask handling (diff) | |
| download | linux-5e40fb2d4a4c7503cab4f923b7d985dbcf583581.tar.xz linux-5e40fb2d4a4c7503cab4f923b7d985dbcf583581.zip | |
x86/cpu/topology: Simplify cpu_mark_primary_thread()
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
Diffstat (limited to 'arch/x86/kernel/cpu/topology.c')
| -rw-r--r-- | arch/x86/kernel/cpu/topology.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/topology.c b/arch/x86/kernel/cpu/topology.c index f3397e233ffb..aea408de3be4 100644 --- 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 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 |