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| author |   Yinghai Lu <yhlu.kernel@gmail.com> | 2008-08-11 13:36:04 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-08-11 22:42:59 +0200 |
| commit | b74548e76a0eab1f29546e7c5a589429c069a680 (patch) | |
| tree | c5e0e86109466568d3b486177e41e2ad90a2473a /arch/x86/kernel/smpboot.c | |
| parent | x86: make "apic" an early_param() on 32-bit, NULL check (diff) | |
| download | linux-dev-b74548e76a0eab1f29546e7c5a589429c069a680.tar.xz linux-dev-b74548e76a0eab1f29546e7c5a589429c069a680.zip | |
x86: fix 2.6.27rc1 cannot boot more than 8CPUs
Jeff Chua reported that booting a !bigsmp kernel on a 16-way box
hangs silently.
this is a long-standing issue, smp start AP cpu could check the
apic id >=8 etc before trying to start it.
achieve this by moving the def_to_bigsmp check later and skip the
apicid id > 8
[ mingo@elte.hu: clean up the message that is printed. ]
Reported-by: "Jeff Chua" <jeff.chua.linux@gmail.com>
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/setup.c | 6 ------
arch/x86/kernel/smpboot.c | 10 ++++++++++
2 files changed, 10 insertions(+), 6 deletions(-)
Diffstat (limited to 'arch/x86/kernel/smpboot.c')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index da10f07fc59c..91055d7fc1b0 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -994,7 +994,17 @@ int __cpuinit native_cpu_up(unsigned int cpu) flush_tlb_all(); low_mappings = 1; +#ifdef CONFIG_X86_PC + if (def_to_bigsmp && apicid > 8) { + printk(KERN_WARNING + "More than 8 CPUs detected - skipping them.\n" + "Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.\n"); + err = -1; + } else + err = do_boot_cpu(apicid, cpu); +#else err = do_boot_cpu(apicid, cpu); +#endif zap_low_mappings(); low_mappings = 0; |