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[IA64] Do not call SN_SAL_SET_CPU_NUMBER twice on cpu 0

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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>
This commit is contained in:
Jay Lan 2006-12-11 15:39:23 -08:00 committed by Tony Luck
parent 3640543df2
commit adf142e379
1 changed files with 10 additions and 2 deletions
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12
arch/ia64/sn/kernel/setup.c
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@ -580,7 +580,7 @@ void __cpuinit sn_cpu_init(void)
int slice;
int cnode;
int i;
static int wars_have_been_checked;
static int wars_have_been_checked, set_cpu0_number;
cpuid = smp_processor_id();
if (cpuid == 0 && IS_MEDUSA()) {
@ -605,8 +605,16 @@ void __cpuinit sn_cpu_init(void)
/*
* Don't check status. The SAL call is not supported on all PROMs
* but a failure is harmless.
* Architechtuallly, cpu_init is always called twice on cpu 0. We
* should set cpu_number on cpu 0 once.
*/
(void) ia64_sn_set_cpu_number(cpuid);
if (cpuid == 0) {
if (!set_cpu0_number) {
(void) ia64_sn_set_cpu_number(cpuid);
set_cpu0_number = 1;
}
} else
(void) ia64_sn_set_cpu_number(cpuid);
/*
* The boot cpu makes this call again after platform initialization is