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ACPI: boot correctly with "nosmp" or "maxcpus=0"

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In MPS mode, "nosmp" and "maxcpus=0" boot a UP kernel with IOAPIC disabled.
However, in ACPI mode, these parameters didn't completely disable
the IO APIC initialization code and boot failed.

init/main.c:
	Disable the IO_APIC if "nosmp" or "maxcpus=0"
	undefine disable_ioapic_setup() when it doesn't apply.

i386:
	delete ioapic_setup(), it was a duplicate of parse_noapic()
	delete undefinition of disable_ioapic_setup()

x86_64:
	rename disable_ioapic_setup() to parse_noapic() to match i386
	define disable_ioapic_setup() in header to match i386

http://bugzilla.kernel.org/show_bug.cgi?id=1641

Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown
2007-08-16 03:34:22 -04:00
parent 28e8351ac2
commit 61ec7567db
6 changed files with 25 additions and 25 deletions
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12
init/main.c
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@@ -146,9 +146,14 @@ static unsigned int __initdata max_cpus = NR_CPUS;
* greater than 0, limits the maximum number of CPUs activated in
* SMP mode to <NUM>.
*/
#ifndef CONFIG_X86_IO_APIC
static inline void disable_ioapic_setup(void) {};
#endif
static int __init nosmp(char *str)
{
max_cpus = 0;
disable_ioapic_setup();
return 0;
}
@@ -157,10 +162,13 @@ early_param("nosmp", nosmp);
static int __init maxcpus(char *str)
{
get_option(&str, &max_cpus);
return 1;
if (max_cpus == 0)
disable_ioapic_setup();
return 0;
}
__setup("maxcpus=", maxcpus);
early_param("maxcpus=", maxcpus);
#else
#define max_cpus NR_CPUS
#endif