Re: linux 3.10.1 with initrd (was Re: linux 3.8.12-1 (atari flavour) does not boot)

[Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>]

Hi Geert,

> > [    0.160000] WARNING: at /root/linux-3.10.1/init/main.c:698 do_one_initcall+0x12e/0x13a()
> > [    0.160000] initcall param_sysfs_init+0x0/0x1a4 returned with disabled interrupts
> >
> > This seems to happen for several initcalls. Geert et al,
> > can you have a look at them, they’re scary ☺
>
> It only happens on multi-platform kernels, because of the following definition
> of ALLOWINT:
>
> #if defined(MACH_ATARI_ONLY)
> /* block out HSYNC = ipl 2 on the atari */
> #define ALLOWINT        (~0x500)
> #else
> /* portable version */
> #define ALLOWINT        (~0x700)
> #endif /* machine compilation types */
>
> On an Atari-only kernel, flags is either 0x00c02204 or 0x00c02214.
> Hence "flags & ~ALLOWINT" is "flags & 0x500" is always zero.
>
> On a multi-platform kernel, flags is one of 0x00c02004, 0x00c02014,
> 0x00c02204, or 0x00c02214.
> Hence "flags & ~ALLOWINT" is "flags & 0x700" is sometimes non-zero,
> triggering the warning.
>
> Anyone who sees a solution that doesn't involve adding a variable to hold
> ALLOWINT?
>
> We're already having a check for Q40 in arch_local_irq_enable()
> (in multi-platfom kernels only).

Didn't we have that sorted out earlier? I seem to recall this has surfaced before. 

What is the cause of the problem exactly - the hsync handler changing the IPL to block out further interrupts, whenever it is called for the first time after interrupts are enabled? We could stop doing that on multi-platform kernels (taking all hsync interrupts will be a performance hit but not stop the system from working). 

Cheers,

Michael


> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
>
>
> --
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