Blackfin: allow high priority domains to preempt schedule_tail()

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ret_from_fork is always entered with hw interrupts off, which prevents
real-time domains to preempt the Linux kernel during part of the
initial context switch to the new task, which could in turn raise the
worst-case latency figures.

To avoid this, stall the root domain stage in the interrupt pipeline
to keep the scheduling tail code free from Linux-handled IRQs, then
enable hardware interrupts again.

Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

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Philippe Gerum 2009-06-22 18:23:32 +02:00 • committed by Mike Frysinger

parent bc569f1a77

commit 6b8019c85e

1 changed files with 22 additions and 2 deletions

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arch/blackfin/kernel/entry.S

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