On Tue, 2011-03-01 at 11:50 +0100, Kolja Waschk wrote:
> Hi,
>
> >> http://www.ixo.de/tmp/till20110228.tgz
>
> After verifying that no one yet checked, I updated the code in the archive to
> even better reflect the "real" situation. The main thread emits a number on
> stdout every second endlessly, waiting for SIGINT. To trigger the fault, it
> is necessary to contact the net server (with wget as I described) in a fast
> loop and after some time (about 2 seconds in my setup) the kernel fault
> occurs.
>
> Parameters to tune the load on the system are the frame size (MODT_BUFLEN in
> modt.h) and a nop loop in till.c rtdm_loop() (line 84). The BF537 here is
> running with 133 MHz bus clock, 533 MHz system clock.
>
100% reproducible here as well. Does this fix help?
diff --git a/arch/blackfin/mach-common/entry.S
b/arch/blackfin/mach-common/entry.S
index a5847f5..a7650ce 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -892,8 +892,17 @@ ENDPROC(_ret_from_exception)
#ifdef CONFIG_IPIPE
_resume_kernel_from_int:
+ r1 = LO(~0x8000) (Z);
+ r1 = r0 & r1;
+ r0 = 1;
+ r0 = r1 - r0;
+ r2 = r1 & r0;
+ cc = r2 == 0;
+ /* Sync the root stage only from the outer interrupt level. */
+ if !cc jump .Lnosync;
r0.l = ___ipipe_sync_root;
r0.h = ___ipipe_sync_root;
+ [--sp] = reti;
[--sp] = rets;
[--sp] = ( r7:4, p5:3 );
SP += -12;
@@ -901,6 +910,8 @@ _resume_kernel_from_int:
SP += 12;
( r7:4, p5:3 ) = [sp++];
rets = [sp++];
+ reti = [sp++];
+.Lnosync:
rts
#else
#define _resume_kernel_from_int 2f
--
Philippe.
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