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| 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/mca.c | |
| parent | [IA64] kdump: Try INIT regardless of (diff) | |
| download | linux-dev-0cced40e7c58b1105aef3ca446da7b158a18a9a6.tar.xz linux-dev-0cced40e7c58b1105aef3ca446da7b158a18a9a6.zip | |
[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/mca.c')
| -rw-r--r-- | arch/ia64/kernel/mca.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c index 7b30d21c5190..d2877a7bfe2e 100644 --- a/arch/ia64/kernel/mca.c +++ b/arch/ia64/kernel/mca.c @@ -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); |