[Xen-devel] [PATCH] do_softirq() of Xen/IA64

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

context_switch() of Xen/IA64 returns unlike Xen/x86.
On the other hand xen vcpu switch is done by softirq drivern timer handler.
As a result smp_processor_id() may change on Xen/IA64 right after
calling a handler in do_softirq().
If it happens, do_softirq() touches another physical cpu's softirq_pending.
This patch fixes it.

It is needless to use smp_processor_id() twice on x86.
Should #ifndef be used around cpu = smp_processor_id()?
Or should something like __ARCH_HAVE_DO_SORTIRQ be introduced?

Thanks
-- 
yamahata

Attachment: 10521:42be9580779e_do_softirq_cpu.patch
Description: Text document

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