tree 502be06afc9116fa993807a758a998c23fc8d14a
parent 697a9d65aa799940da1c9145944c6b9bd0f442c5
author Bernd Schmidt <bernds_cb1@t-online.de> 1208976996 +0800
committer Bryan Wu <cooloney@kernel.org> 1208976996 +0800

[Blackfin] arch: fix bug - a crash on bootup with CONFIG_MPU on the BF548

The function flush_switched_dcplbs was clearing the CPLB entries covering
the process permission bitmasks.  This means that the sequence

	flush_switched_dcplbs ();
        set_mask_dcplbs(mm->context.page_rwx_mask);

has a problem: if kernel code (such as an interrupt) causes a CPLB miss before
set_mask_dcplbs completes, the CPLB handler function causes a double fault,
with an instantaneous reboot.

This bug fix is dedicated to Michael Hennerich, the only person in the world
capable of providing working JTAG hardware.

Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>