From: Philippe Gerum <rpm@xenomai.org>
Date: Mon, 22 Jun 2009 16:23:32 +0000 (+0200)
Subject: Blackfin: allow high priority domains to preempt schedule_tail()
X-Git-Tag: v2.6.32-rc1~662^2~67
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b8019c85e18295466095a5778a14c1e9a067554;p=pandora-kernel.git

Blackfin: allow high priority domains to preempt schedule_tail()

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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