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

[Michael Schmitz <schmitzmic@gmail.com>]

Geert,
>> So we could stop blocking further interrupts in multi platform kernels. How
>> much of a performance hit will this be on say a stock Falcon or TT?
> That's 15000 - 30000 more interrupts per second.
Yep, but pretty much all NOP. Is the interrupt entry/return that much of 
a hassle these days?
>>> The former is safer but slower, the second is faster but will miss cases
>>> where some interrupt priorities are disabled.
>> The safer but slower option (we can still use the fast version of it on
>> single platform kernels). We should test the faster at any rate to see
>> whether there are really cases where we miss disabled interrupts.
> On single-platform kernels, ALLOWINT = ~0x500, and we can use the
> current (fast) version.

I meant to say that - we can use the current version on single platform 
kernels:

  static inline bool arch_irqs_disabled_flags(unsigned long flags)
  {
+ #if defined(MACH_ATARI_ONLY) || defined(MACH_AMIGA_ONLY)
         return (flags & ~ALLOWINT) != 0;
+ #else
+       if (MACH_IS_ATARI) {
+               /* Ignore HSYNC = ipl 2 on Atari */
+               return (flags & ~(ALLOWINT | 0x200)) != 0;
+       } else
+           return (flags & ~ALLOWINT) != 0;
+ #endif
  }


(or whatever compiler flag we have to indicate we're not building a 
multi-platform kernel)

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