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Message-ID: <CAMuHMdW-YBroi6GezUP-KQBVRAcmYtUQERvBC=ekmemopDhVow@mail.gmail.com>
Date: Thu, 19 Sep 2013 20:19:47 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Andreas Schwab <schwab@...ux-m68k.org>,
LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...e.hu>,
Linux-Arch <linux-arch@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andi Kleen <ak@...ux.intel.com>, Peter Anvin <hpa@...or.com>,
Mike Galbraith <bitbucket@...ine.de>,
Arjan van de Ven <arjan@...ux.intel.com>,
Frederic Weisbecker <fweisbec@...il.com>,
"Linux/m68k" <linux-m68k@...r.kernel.org>
Subject: Re: [patch 1/6] hardirq: Make hardirq bits generic
On Thu, Sep 19, 2013 at 7:02 PM, Andreas Schwab <schwab@...ux-m68k.org> wrote:
> Thomas Gleixner <tglx@...utronix.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?
--- 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
I'll have a deeper look when I have some more time...
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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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