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[PATCH] x86: sutomatically enable bigsmp when we have more than 8 CPUs

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i386 generic subarchitecture requires explicit dmi strings or command line
to enable bigsmp mode.  The patch below removes that restriction, and uses
bigsmp as soon as it finds more than 8 logical CPUs, Intel processors and
xAPIC support.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Venkatesh Pallipadi
2005-09-03 15:56:31 -07:00
committed by Linus Torvalds
parent 484b90c4b9
commit 911a62d423
8 changed files with 47 additions and 2 deletions
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9
arch/i386/kernel/mpparse.c
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@@ -65,6 +65,8 @@ int nr_ioapics;
int pic_mode;
unsigned long mp_lapic_addr;
unsigned int def_to_bigsmp = 0;
/* Processor that is doing the boot up */
unsigned int boot_cpu_physical_apicid = -1U;
/* Internal processor count */
@@ -213,6 +215,13 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
ver = 0x10;
}
apic_version[m->mpc_apicid] = ver;
if ((num_processors > 8) &&
APIC_XAPIC(ver) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL))
def_to_bigsmp = 1;
else
def_to_bigsmp = 0;
bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
}