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| author | Len Brown <len.brown@intel.com> | 2007-08-16 03:34:22 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-08-21 00:33:35 -0400 |
| commit | 61ec7567db103d537329b0db9a887db570431ff4 (patch) | |
| tree | 7287eb4bd00c09434fc2dd0babadfd0eb7ddc832 /init/main.c | |
| parent | 28e8351ac22de25034e048c680014ad824323c65 (diff) | |
| download | linux-61ec7567db103d537329b0db9a887db570431ff4.tar.gz linux-61ec7567db103d537329b0db9a887db570431ff4.tar.bz2 linux-61ec7567db103d537329b0db9a887db570431ff4.zip | |
ACPI: boot correctly with "nosmp" or "maxcpus=0"
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>
Diffstat (limited to 'init/main.c')
| -rw-r--r-- | init/main.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/init/main.c b/init/main.c index d3bcb3b11620..cc0653ec081d 100644 --- a/init/main.c +++ b/init/main.c @@ -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 |