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x86: fix stack overflow for large values of MAX_APICS

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physid_mask_of_physid() causes a huge stack (12k) to be created if the
number of APICS is large. Replace physid_mask_of_physid() with a
new function that does not create large stacks. This is a problem only
on large x86_64 systems.

this paves the way to increase MAX_APICS.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Cc: linux-mm@kvack.org
Cc: mingo@elte.hu
Cc: tglx@linutronix.de
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jack Steiner
2008-06-19 21:51:05 -05:00
committed by Ingo Molnar
parent d400524aff
commit b6df1b8bc1
4 changed files with 11 additions and 5 deletions
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5
arch/x86/kernel/smpboot.c
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@@ -1091,10 +1091,9 @@ static __init void disable_smp(void)
smpboot_clear_io_apic_irqs();
#endif
if (smp_found_config)
phys_cpu_present_map =
physid_mask_of_physid(boot_cpu_physical_apicid);
physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
else
phys_cpu_present_map = physid_mask_of_physid(0);
physid_set_mask_of_physid(0, &phys_cpu_present_map);
map_cpu_to_logical_apicid();
cpu_set(0, per_cpu(cpu_sibling_map, 0));
cpu_set(0, per_cpu(cpu_core_map, 0));