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[PATCH] x86_64: Don't assume BSP has ID 0 in new smp bootup

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This patch removes the assumption that LAPIC entries contain the BSP as its
first entry.  This is a slight improvement to the temporary fix submitted by
Suresh Siddha.

- Removes assumption that LAPIC entries contain BSP first.

- Builds x86_acpiid_to_apicid[] and bios_cpu_apicid[] properly with BSP as
  first entry.

- Made maxcpus=1 boot on these systems.  Since the parsing earlier in
  arch/x86_64/kernel/mpparse.c stopped after maxcpus entries, other entries
  were not processed, this causes kernel not to boot on these systems.

TBD: x86_acpiid_to_apicid and bios_cpu_apicid[] seem to be exactly the
     same.  This could be removed, but might need more work to cleanup.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-05-16 21:53:35 -07:00 committed by Linus Torvalds
parent 751521149a
commit 18a2b64712
2 changed files with 14 additions and 8 deletions
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20
arch/x86_64/kernel/mpparse.c
View File

@ -107,6 +107,7 @@ static int __init mpf_checksum(unsigned char *mp, int len)
static void __init MP_processor_info (struct mpc_config_processor *m)
{
int ver;
static int found_bsp=0;
if (!(m->mpc_cpuflag & CPU_ENABLED))
return;
@ -126,11 +127,6 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
" Processor ignored.\n", NR_CPUS);
return;
}
if (num_processors >= maxcpus) {
printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
" Processor ignored.\n", maxcpus);
return;
}
num_processors++;
@ -150,7 +146,19 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
ver = 0x10;
}
apic_version[m->mpc_apicid] = ver;
bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
/*
* bios_cpu_apicid is required to have processors listed
* in same order as logical cpu numbers. Hence the first
* entry is BSP, and so on.
*/
bios_cpu_apicid[0] = m->mpc_apicid;
x86_cpu_to_apicid[0] = m->mpc_apicid;
found_bsp = 1;
} else {
bios_cpu_apicid[num_processors - found_bsp] = m->mpc_apicid;
x86_cpu_to_apicid[num_processors - found_bsp] = m->mpc_apicid;
}
}
static void __init MP_bus_info (struct mpc_config_bus *m)

2
arch/x86_64/kernel/smpboot.c
View File

@ -645,7 +645,6 @@ static int __cpuinit do_boot_cpu(int cpu, int apicid)
printk("failed fork for CPU %d\n", cpu);
return PTR_ERR(idle);
}
x86_cpu_to_apicid[cpu] = apicid;
cpu_pda[cpu].pcurrent = idle;
@ -954,7 +953,6 @@ void __cpuinit smp_prepare_cpus(unsigned int max_cpus)
GET_APIC_ID(apic_read(APIC_ID)), boot_cpu_id);
/* Or can we switch back to PIC here? */
}
x86_cpu_to_apicid[0] = boot_cpu_id;
/*
* Now start the IO-APICs