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authorRobin Getz <robin.getz@analog.com>2009-06-22 02:02:16 +0000
committerMike Frysinger <vapier@gentoo.org>2009-09-16 21:28:28 -0400
commitae4f073c40bf677b03826262e6022b4a251fe437 (patch)
tree452c91be30a3970efbea5780d368945e7f63712c /arch/blackfin/include
parentd4b834c13940b5433d16ae3605794b3d74804348 (diff)
Blackfin: make EVT3->EVT5 lowering more robust wrt IPEND[4]
We handle many exceptions at EVT5 (hardware error level) so that we can catch exceptions in our exception handling code. Today - if the global interrupt enable bit (IPEND[4]) is set (interrupts disabled) our trap handling code goes into a infinite loop, since we need interrupts to be on to defer things to EVT5. Normal kernel code should not trigger this for any reason as IPEND[4] gets cleared early (when doing an interrupt context save) and the kernel stack there should be sane (or something much worse is happening in the system). But there have been a few times where this has happened, so this change makes sure we dump a proper crash message even when things have gone south. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/include')
-rw-r--r--arch/blackfin/include/asm/pda.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/pda.h b/arch/blackfin/include/asm/pda.h
index b42555c1431..69b96b40c18 100644
--- a/arch/blackfin/include/asm/pda.h
+++ b/arch/blackfin/include/asm/pda.h
@@ -50,6 +50,7 @@ struct blackfin_pda { /* Per-processor Data Area */
unsigned long ex_optr;
unsigned long ex_buf[4];
unsigned long ex_imask; /* Saved imask from exception */
+ unsigned long ex_ipend; /* Saved IPEND from exception */
unsigned long *ex_stack; /* Exception stack space */
#ifdef ANOMALY_05000261