diff options
| author | Jay Lan <jlan@sgi.com> | 2006-12-11 15:39:23 -0800 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2006-12-12 10:09:39 -0800 |
| commit | adf142e379bd20ad906a7e36f722eaabb3b44b0c (patch) | |
| tree | bcd0e2054bdaf023e211169bd46bb334b6cdcb11 /arch/ia64/sn | |
| parent | 3640543df26fd38f31f0c6decc35c07be2a6307c (diff) | |
| download | op-kernel-dev-adf142e379bd20ad906a7e36f722eaabb3b44b0c.zip op-kernel-dev-adf142e379bd20ad906a7e36f722eaabb3b44b0c.tar.gz | |
[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>
Diffstat (limited to 'arch/ia64/sn')
| -rw-r--r-- | arch/ia64/sn/kernel/setup.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/ia64/sn/kernel/setup.c b/arch/ia64/sn/kernel/setup.c index a934ad0..8571e52 100644 --- a/arch/ia64/sn/kernel/setup.c +++ b/arch/ia64/sn/kernel/setup.c @@ -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 |
