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authorJuergen Gross <jgross@suse.com>2023-10-24 13:51:36 +0200
committerJuergen Gross <jgross@suse.com>2023-11-13 07:22:00 +0100
commite64e7c74b99ec9e439abca75f522f4b98f220bd1 (patch)
treebf1beaabc09842d03aa36ae4307e3ec00d7620d6 /arch/Kconfig
parentb85ea95d086471afb4ad062012a4d73cd328fa86 (diff)
xen/events: avoid using info_for_irq() in xen_send_IPI_one()
xen_send_IPI_one() is being used by cpuhp_report_idle_dead() after it calls rcu_report_dead(), meaning that any RCU usage by xen_send_IPI_one() is a bad idea. Unfortunately xen_send_IPI_one() is using notify_remote_via_irq() today, which is using irq_get_chip_data() via info_for_irq(). And irq_get_chip_data() in turn is using a maple-tree lookup requiring RCU. Avoid this problem by caching the ipi event channels in another percpu variable, allowing the use notify_remote_via_evtchn() in xen_send_IPI_one(). Fixes: 721255b9826b ("genirq: Use a maple tree for interrupt descriptor management") Reported-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Juergen Gross <jgross@suse.com> Tested-by: David Woodhouse <dwmw@amazon.co.uk> Acked-by: Stefano Stabellini <sstabellini@kernel.org> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/Kconfig')
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