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[IA64] Do not call SN_SAL_SET_CPU_NUMBER twice on cpu 0
This is an SN specific patch.
Architectually, cpu_init is always called twice on cpu 0
and thus resulted in two SN_SAL_SET_CPU_NUMBER calls.
This was harmless in production kernel; however, it can
cause problem on booting up a crashdump kernel at Altix.
Here is the patch that detects the second sn_cpu_init
call and skips the second call to SN_SAL_SET_CPU_NUMBER.
Signed-Off-By: Jay Lan <jlan@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
+10
-2
arch/ia64/sn/kernel/setup.c
+10
-2
arch/ia64/sn/kernel/setup.c
···
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int slice;
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int cnode;
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int i;
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-
static int wars_have_been_checked;
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+
static int wars_have_been_checked, set_cpu0_number;
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cpuid = smp_processor_id();
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if (cpuid == 0 && IS_MEDUSA()) {
···
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/*
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* Don't check status. The SAL call is not supported on all PROMs
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* but a failure is harmless.
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+
* Architechtuallly, cpu_init is always called twice on cpu 0. We
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* should set cpu_number on cpu 0 once.
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*/
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-
(void) ia64_sn_set_cpu_number(cpuid);
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+
if (cpuid == 0) {
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if (!set_cpu0_number) {
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(void) ia64_sn_set_cpu_number(cpuid);
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set_cpu0_number = 1;
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}
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} else
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(void) ia64_sn_set_cpu_number(cpuid);
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/*
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* The boot cpu makes this call again after platform initialization is