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RE: [microblaze-uclinux] Linux hang in restore_context (PetaLinuxv0.30-rc1,kernel 2.6.20-uc0)
Hi,
I have not seen an answer to the question below as to whether or not
the system.h file needs to be patched.
I too was having trouble with the same problem and applied the
patch for entry.s as shown in John's letter below. This has
fixed some of the problems I am having, but not all.
In light of this, I have a few questions:
Is there an irq related patch for include/asm-microblaze/system.h?
Is there a way to get a complete set of bug fix patches for v0.30-rc1?
When do you think a new release of v0.30 will be made that includes bug
fixes?
We are running microblaze 6.00b - is it really important to update to 7.10a
to address interrupt related problems?
(e.g. BUG: at kernel/softirq.c:144 local_bh_enable() )
Thanks,
Steve Sjoquist
-----Original Message-----
From: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] On Behalf Of Brettschneider
Falk
Sent: Friday, March 07, 2008 4:33 AM
To: microblaze-uclinux@xxxxxxxxxxxxxx
Subject: RE: [microblaze-uclinux] Linux hang in restore_context
(PetaLinuxv0.30-rc1,kernel 2.6.20-uc0)
Hi,
thanks very much! Going to try it next...
Is your include/asm-microblaze/system.h also patched, locally?
(Because following that certain discussion thread I've also found this:
http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/archive/2007/11/msg00
075.html.)
Cheers, F@lk
> -----Original Message-----
> From: John Williams [mailto:jwilliams@xxxxxxxxxxxxxx]
> Sent: Friday, March 07, 2008 12:41 PM
> To: microblaze-uclinux@xxxxxxxxxxxxxx
> Subject: Re: [microblaze-uclinux] Linux hang in restore_context
> (PetaLinuxv0.30-rc1,kernel 2.6.20-uc0)
>
>
> Hi Falk,
>
> Here's the change that's in our internal tree - there was a slight
> problem with the original patch from Kenneth:
>
> Index: software/linux-2.6.x-petalogix/arch/microblaze/kernel/entry.S
> ===================================================================
> --- software/linux-2.6.x-petalogix/arch/microblaze/kernel/entry.S
> (revision 3290)
> +++ software/linux-2.6.x-petalogix/arch/microblaze/kernel/entry.S
> (revision 3389)
> @@ -122,7 +122,7 @@
>
> ret_from_intr:
> - lwi r11, r1, PT_MODE
> - bneid r11, 3f
> -
> + /* Returning to kernel mode? Skip the sigpend and
> sched checks */
> + lwi r20, r1, PT_MODE
> + bneid r20, no_intr_resched
>
> lwi r6, r31, TS_THREAD_INFO /* get thread info */
> @@ -135,5 +135,5 @@
> nop
> 1: andi r11, r19, _TIF_SIGPENDING
> - beqid r11, no_intr_reshed
> + beqid r11, no_intr_resched
> addk r5, r1, r0
> addk r7, r0, r0
> @@ -141,11 +141,12 @@
> addk r6, r0, r0
>
> -no_intr_reshed:
> - /* save mode indicator */
> - lwi r11, r1, PT_MODE
> -3:
> - swi r11, r0, PER_CPU(KM)
> -
> - /* save r31 */
> +no_intr_resched:
> + /* Disable interrupts, we are now committed to the
> state restore */
> + disable_irq
> +
> + /* Save kernel mode indicator */
> + swi r20, r0, PER_CPU(KM)
> +
> + /* save r31 ("current" ptr)*/
> swi r31, r0, PER_CPU(CURRENT_SAVE)
> restore_context:
>
>
> Brettschneider Falk wrote:
>
> > Hi,
> >
> > John Williams wrote:
> >
> >>A couple of things - first of all, make sure you try the MicroBlaze
> >>"tactical" patches from Xilinx
> >
> > Hmm...I still use CPU version 4.00.b. So I wonder if the
> patch also helps for that version.
> >
> >
> >>Secondly, there was a patch posted late 2007/early 2008 that also
> >>fixes an issue that was found in the high IRQ load scenario.
> >
> > Do you mean this?:
> >
http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/archive/2007/11/msg00
048.html
> It's a good hint. I thought it's already in PetaLinux-0.3-rc1 but
obviously it isn't. Trying that patch...
>
> Cheers,
> Falk
>
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> microblaze-uclinux@xxxxxxxxxxxxxx
> Project Home Page :
> http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
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> http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
>
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