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authorAshok Raj <ashok.raj@intel.com>2006-03-25 16:29:28 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-25 09:10:53 -0800
commit51f62e186b78f8743246a349b09be370c8735479 (patch)
treee8b4f95445a581c3844beafb45654cefff5c490d
parent45948d7720e8bd0104696087c6305fdd90e3b298 (diff)
[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: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/x86_64/kernel/mpparse.c19
-rw-r--r--arch/x86_64/kernel/setup.c6
2 files changed, 14 insertions, 11 deletions
diff --git a/arch/x86_64/kernel/mpparse.c b/arch/x86_64/kernel/mpparse.c
index 9013a90b5c2..b17cf3eba35 100644
--- a/arch/x86_64/kernel/mpparse.c
+++ b/arch/x86_64/kernel/mpparse.c
@@ -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++;
@@ -133,8 +133,10 @@ 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) {
printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
@@ -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)
{
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index f227d0c23dc..50cd2bbd75a 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -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.