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List:       linux-m68k
Subject:    Re: [patch 1/6] hardirq: Make hardirq bits generic
From:       Thomas Gleixner <tglx () linutronix ! de>
Date:       2013-09-20 9:26:13
Message-ID: alpine.DEB.2.02.1309201124211.4089 () ionos ! tec ! linutronix ! de
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On Thu, 19 Sep 2013, Geert Uytterhoeven wrote:

> On Thu, Sep 19, 2013 at 7:02 PM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> > Thomas Gleixner <tglx@linutronix.de> writes:
> >> +     /*
> >> +      * Only the last interrupt leaving the kernel goes through the
> >> +      * various exception return checks.
> >> +      */
> >> +     cmpl    #0, %d0
> >         tstl    %d0
> 
> arch/m68k/kernel/built-in.o: In function `bad_inthandler':
> (.text+0x2a6): undefined reference to `ret_from_last_interrupt'
> 
> I came up with the quick (whitespace-damaged-gmail) fix below.
> Or should we handle the nesting in handle_badint(), too?

Hmm, probably yes. If a badint gets interrupted by a good one, you
would fail to go through ret_from_exception.
 
> --- a/arch/m68k/kernel/entry.S
> +++ b/arch/m68k/kernel/entry.S
> @@ -313,17 +313,11 @@ user_irqvec_fixup = . + 2
> 
>  ENTRY(bad_inthandler)
>         SAVE_ALL_INT
> -       GET_CURRENT(%d0)
> -       movel   %d0,%a1
> -       addqb   #1,%a1@(TINFO_PREEMPT+1)
> 
>         movel   %sp,%sp@-
>         jsr     handle_badint
>         addql   #4,%sp
> 
> -       movel   %curptr@(TASK_STACK),%a1
> -       subqb   #1,%a1@(TINFO_PREEMPT+1)
> -       jeq     ret_from_last_interrupt
>         RESTORE_ALL
> 
> However, the resulting kernel hangs (on ARAnyM) after starting userspace:
> 
> | INIT: version 2.86 booting

Hmm.
 
> I'll have a deeper look when I have some more time...

Thanks a lot!

       tglx
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