mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-06 11:26:22 -04:00
Code Issues Packages Projects Releases Wiki Activity

x86/cpu/topology: Mop up primary thread mask handling

Browse Source 
The early initcall to initialize the primary thread mask is not longer
required because topology_init_possible_cpus() can mark primary threads
correctly when initializing the possible and present map as the number of
SMT threads is already determined correctly.

The XENPV workaround is not longer required because XENPV now registers
fake APIC IDs which will just work like any other enumeration.

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/20240213210252.736104257@linutronix.de
This commit is contained in:
Thomas Gleixner
2024-02-13 22:06:05 +01:00
parent 090610ba70
commit 882e0cff9e
1 changed files with 2 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
arch/x86/kernel/cpu/topology.c
View File

@@ -82,30 +82,6 @@ static void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid)
if (smp_num_siblings == 1 || !(apicid & mask))
cpumask_set_cpu(cpu, &__cpu_primary_thread_mask);
}
/*
* Due to the utter mess of CPUID evaluation smp_num_siblings is not valid
* during early boot. Initialize the primary thread mask before SMP
* bringup.
*/
static int __init smp_init_primary_thread_mask(void)
{
unsigned int cpu;
/*
* XEN/PV provides either none or useless topology information.
* Pretend that all vCPUs are primary threads.
*/
if (xen_pv_domain()) {
cpumask_copy(&__cpu_primary_thread_mask, cpu_possible_mask);
return 0;
}
for (cpu = 0; cpu < topo_info.nr_assigned_cpus; cpu++)
cpu_mark_primary_thread(cpu, cpuid_to_apicid[cpu]);
return 0;
}
early_initcall(smp_init_primary_thread_mask);
#else
static inline void cpu_mark_primary_thread(unsigned int cpu, unsigned int apicid) { }
#endif
@@ -151,9 +127,6 @@ static void topo_set_cpuids(unsigned int cpu, u32 apic_id, u32 acpi_id)
#endif
set_cpu_possible(cpu, true);
set_cpu_present(cpu, true);
if (system_state != SYSTEM_BOOTING)
cpu_mark_primary_thread(cpu, apic_id);
}
static __init bool check_for_real_bsp(u32 apic_id)
@@ -282,6 +255,7 @@ int topology_hotplug_apic(u32 apic_id, u32 acpi_id)
set_bit(apic_id, phys_cpu_present_map);
topo_set_cpuids(cpu, apic_id, acpi_id);
cpu_mark_primary_thread(cpu, apic_id);
return cpu;
}
@@ -414,6 +388,7 @@ void __init topology_init_possible_cpus(void)
if (apicid == BAD_APICID)
continue;
cpu_mark_primary_thread(cpu, apicid);
set_cpu_present(cpu, test_bit(apicid, phys_cpu_present_map));
}
}