diff options
| author | Hidetoshi Seto <[seto.hidetoshi@jp.fujitsu.com]> | 2009-08-06 14:51:58 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2009-09-14 16:19:24 -0700 |
| commit | 0cced40e7c58b1105aef3ca446da7b158a18a9a6 (patch) | |
| tree | 401e554f0e69375833e6ef70651eacb44ed50909 /arch/ia64/kernel/crash.c | |
| parent | 5959906ee9dee602a46e49c868a7e543e050d605 (diff) | |
[IA64] kdump: Short path to freeze CPUs
Setting monarch_cpu = -1 to let slaves frozen might not work, because
there might be slaves being late, not entered the rendezvous yet.
Such slaves might be caught in while (monarch_cpu == -1) loop.
Use kdump_in_progress instead of monarch_cpus to break INIT rendezvous
and let all slaves enter DIE_INIT_SLAVE_LEAVE smoothly.
And monarch no longer need to manage rendezvous if once kdump_in_progress
is set, catch the monarch in DIE_INIT_MONARCH_ENTER then.
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Haren Myneni <hbabu@us.ibm.com>
Cc: kexec@lists.infradead.org
Acked-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/crash.c')
| -rw-r--r-- | arch/ia64/kernel/crash.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c index 0995fdc7b299..6631a9dfafdc 100644 --- a/arch/ia64/kernel/crash.c +++ b/arch/ia64/kernel/crash.c @@ -127,14 +127,13 @@ machine_crash_shutdown(struct pt_regs *pt) * If an INIT is asserted here: * - All receivers might be slaves, since some of cpus could already * be frozen and INIT might be masked on monarch. In this case, - * all slaves will park in while (monarch_cpu == -1) loop before - * DIE_INIT_SLAVE_ENTER that for waiting monarch enters. - * => TBD: freeze all slaves + * all slaves will be frozen soon since kdump_in_progress will let + * them into DIE_INIT_SLAVE_LEAVE. * - One might be a monarch, but INIT rendezvous will fail since * at least this cpu already have INIT masked so it never join * to the rendezvous. In this case, all slaves and monarch will - * be frozen after timeout of the INIT rendezvous. - * => TBD: freeze them without waiting timeout + * be frozen soon with no wait since the INIT rendezvous is skipped + * by kdump_in_progress. */ kdump_smp_send_stop(); /* not all cpu response to IPI, send INIT to freeze them */ @@ -187,6 +186,7 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data) break; /* fall through */ case DIE_INIT_SLAVE_LEAVE: + case DIE_INIT_MONARCH_ENTER: case DIE_MCA_RENDZVOUS_LEAVE: unw_init_running(kdump_cpu_freeze, NULL); break; @@ -217,7 +217,6 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data) if (kdump_on_init && (nd->sos->rv_rc != 1)) { if (atomic_inc_return(&kdump_in_progress) != 1) kdump_freeze_monarch = 1; - *(nd->monarch_cpu) = -1; } break; case DIE_INIT_MONARCH_LEAVE: @@ -228,10 +227,8 @@ kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data) case DIE_MCA_MONARCH_LEAVE: /* *(nd->data) indicate if MCA is recoverable */ if (kdump_on_fatal_mca && !(*(nd->data))) { - if (atomic_inc_return(&kdump_in_progress) == 1) { - *(nd->monarch_cpu) = -1; + if (atomic_inc_return(&kdump_in_progress) == 1) machine_kdump_on_init(); - } /* We got fatal MCA while kdump!? No way!! */ } break; |