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[IA64] kdump: Short path to freeze CPUs

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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>
This commit is contained in:
Hidetoshi Seto
2009-08-06 14:51:58 -07:00
committed by Tony Luck
parent 5959906ee9
commit 0cced40e7c
2 changed files with 19 additions and 11 deletions
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15
arch/ia64/kernel/mca.c
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@@ -1682,14 +1682,25 @@ ia64_init_handler(struct pt_regs *regs, struct switch_stack *sw,
if (!sos->monarch) {
ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_INIT;
#ifdef CONFIG_KEXEC
while (monarch_cpu == -1 && !atomic_read(&kdump_in_progress))
udelay(1000);
#else
while (monarch_cpu == -1)
cpu_relax(); /* spin until monarch enters */
cpu_relax(); /* spin until monarch enters */
#endif
NOTIFY_INIT(DIE_INIT_SLAVE_ENTER, regs, (long)&nd, 1);
NOTIFY_INIT(DIE_INIT_SLAVE_PROCESS, regs, (long)&nd, 1);
#ifdef CONFIG_KEXEC
while (monarch_cpu != -1 && !atomic_read(&kdump_in_progress))
udelay(1000);
#else
while (monarch_cpu != -1)
cpu_relax(); /* spin until monarch leaves */
cpu_relax(); /* spin until monarch leaves */
#endif
NOTIFY_INIT(DIE_INIT_SLAVE_LEAVE, regs, (long)&nd, 1);