Commit 51f62e18 authored by Ashok Raj's avatar Ashok Raj Committed by Linus Torvalds
Browse files

[PATCH] x86_64: cleanup allocating logical cpu numbers in x86_64 



Minor cleanup to lend better for physical CPU hotplug.
Earlier way of using num_processors as index doesnt
fit if CPUs come and go. This makes the code little bit better
to read, and helps physical hotplug use the same functions as boot.

Reserving CPU0 for BSP is too late to be done in smp_prepare_boot_cpu().
Since logical assignments from MADT is already done via
setup_arch()->acpi_boot_init()->parse lapic

Signed-off-by: default avatarAshok Raj <ashok.raj@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 45948d77

arch/x86_64/kernel/mpparse.c

+8 −11
Original line number Diff line number Diff line
@@ -106,11 +106,11 @@ static int __init mpf_checksum(unsigned char *mp, int len) 
	return sum & 0xFF;

}



static void __init MP_processor_info (struct mpc_config_processor *m)

static void __cpuinit MP_processor_info (struct mpc_config_processor *m)

{

	int cpu;

	unsigned char ver;

	static int found_bsp=0;

	cpumask_t tmp_map;



	if (!(m->mpc_cpuflag & CPU_ENABLED)) {

		disabled_cpus++;
@@ -133,7 +133,9 @@ static void __init MP_processor_info (struct mpc_config_processor *m) 
		return;

	}



	cpu = num_processors++;

	num_processors++;

	cpus_complement(tmp_map, cpu_present_map);

	cpu = first_cpu(tmp_map);



#if MAX_APICS < 255	

	if ((int)m->mpc_apicid > MAX_APICS) {
@@ -160,12 +162,7 @@ static void __init MP_processor_info (struct mpc_config_processor *m) 
 		 * entry is BSP, and so on.

 		 */

		cpu = 0;



 		bios_cpu_apicid[0] = m->mpc_apicid;

 		x86_cpu_to_apicid[0] = m->mpc_apicid;

 		found_bsp = 1;

 	} else

		cpu = num_processors - found_bsp;

 	}

	bios_cpu_apicid[cpu] = m->mpc_apicid;

	x86_cpu_to_apicid[cpu] = m->mpc_apicid;
@@ -691,7 +688,7 @@ void __init mp_register_lapic_address ( 
}





void __init mp_register_lapic (

void __cpuinit mp_register_lapic (

	u8			id, 

	u8			enabled)

{

arch/x86_64/kernel/setup.c

+6 −0
Original line number Diff line number Diff line
@@ -708,6 +708,12 @@ void __init setup_arch(char **cmdline_p) 


	check_ioapic();



	/*

	 * set this early, so we dont allocate cpu0

	 * if MADT list doesnt list BSP first

	 * mpparse.c/MP_processor_info() allocates logical cpu numbers.

	 */

	cpu_set(0, cpu_present_map);

#ifdef CONFIG_ACPI

	/*

	 * Read APIC and some other early information from ACPI tables.

CRA Git | Maintained and supported by SUSTech CRA and CCSE