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Red Hat Bugzilla – Attachment 291066 Details for
Bug 427998
RHEL4: Can enter no tick idle mode with RCU pending leading to hang
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[patch]
xen-unstable.hg 10532:4b45f7f62dc7 backported to 2.6.9-67.EL
xen-unstable-10532-4b45f7f62dc7 (text/plain), 1.36 KB, created by
Ian Campbell
on 2008-01-08 16:23:15 UTC
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Description:
xen-unstable.hg 10532:4b45f7f62dc7 backported to 2.6.9-67.EL
Filename:
MIME Type:
Creator:
Ian Campbell
Created:
2008-01-08 16:23:15 UTC
Size:
1.36 KB
patch
obsolete
># HG changeset patch ># User ack@localhost.localdomain ># Node ID 4b45f7f62dc77b7d4d4494fec10fed36070f5ae3 ># Parent bd408087629788124c70bfcfadfdab246dd71a53 >Fix next_timer_interrupt() in patch and update caller >to deal with the case of existing pending timers. >Fixes a dom0 hang at boot time on some HPs where some >dubious USB code is invoked from pci_init() that >potentially calls msleep(10) a few times. >Signed-off-by: Emmanuel Ackaouy <ack@xensource.com> >xen-unstable changeset: 10532:4b45f7f62dc77b7d4d4494fec10fed36070f5ae3 >xen-unstable date: Wed Jun 28 21:51:01 2006 +0100 > >Index: linux-2.6.9-67.0.1.EL/arch/i386/kernel/time-xen.c >=================================================================== >--- linux-2.6.9-67.0.1.EL.orig/arch/i386/kernel/time-xen.c 2008-01-02 15:59:12.000000000 +0000 >+++ linux-2.6.9-67.0.1.EL/arch/i386/kernel/time-xen.c 2008-01-02 16:00:07.000000000 +0000 >@@ -871,12 +871,11 @@ > > smp_mb(); > >- /* Leave ourselves in tick mode if rcu or softirq pending. */ >- if (rcu_needs_cpu(cpu) || local_softirq_pending()) { >+ /* Leave ourselves in tick mode if rcu or softirq or timer pending. */ >+ if (rcu_needs_cpu(cpu) || local_softirq_pending() || >+ (j = next_timer_interrupt(), time_before_eq(j, jiffies))) { > cpu_clear(cpu, nohz_cpu_mask); > j = jiffies + 1; >- } else { >- j = next_timer_interrupt(); > } > > if (HYPERVISOR_set_timer_op(jiffies_to_st(j)) != 0)
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