From: Sergei Shtylylov <sshtylyov@ru.mvista.com>
To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Subject: Re: [PATCH] TX49 MFC0 bug workaround
Date: Fri, 03 Feb 2006 05:12:47 +0300 [thread overview]
Message-ID: <43E2BC1F.7080505@ru.mvista.com> (raw)
In-Reply-To: <20060203.101705.41198541.nemoto@toshiba-tops.co.jp>
Hello.
Atsushi Nemoto wrote:
>>>>>>On Thu, 02 Feb 2006 21:46:25 +0300, Sergei Shtylylov <sshtylyov@ru.mvista.com> said:
>>>
>>>If mfc0 $12 follows store and the mfc0 is last instruction of a
>>>page and fetching the next instruction causes TLB miss, the result
>>>of the mfc0 might wrongly contain EXL bit.
>
>
> sshtylyov> Hmm, a TLB miss in fetching from KSEG0?!
>
> We can call these inline functions from modules running on KSEG2.
Hm, I'm still learning Linux/MIPS, and have overlooked #ifdef MODULE. :-<
If I don't mistake, the offending code is in local_irq_disable,
local_irq_save, and local_irq_restore macros. The effect would be a crash on
any exception taken once interrupts get disabled in a module (*and* that code
happens to fall on a page boundary)... nasty. :-(
> ---
> Atsushi Nemoto
WBR, Sergei
next prev parent reply other threads:[~2006-02-03 2:05 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-02 16:34 [PATCH] TX49 MFC0 bug workaround Atsushi Nemoto
2006-02-02 16:38 ` Maciej W. Rozycki
2006-02-02 16:56 ` Ralf Baechle
2006-02-02 17:04 ` Atsushi Nemoto
2006-02-02 17:21 ` Atsushi Nemoto
2006-02-02 17:24 ` Ralf Baechle
2006-02-03 2:10 ` Atsushi Nemoto
2006-02-03 10:17 ` Maciej W. Rozycki
2006-02-03 14:44 ` Ralf Baechle
2006-02-06 9:36 ` Atsushi Nemoto
2006-02-06 23:22 ` Ralf Baechle
2006-02-03 2:26 ` Sergei Shtylylov
2006-02-03 2:50 ` Atsushi Nemoto
2006-02-02 16:46 ` Ralf Baechle
2006-02-02 18:46 ` Sergei Shtylylov
2006-02-02 22:11 ` Ralf Baechle
2006-02-03 1:17 ` Atsushi Nemoto
2006-02-03 2:12 ` Sergei Shtylylov [this message]
2006-02-03 2:22 ` Atsushi Nemoto
2006-02-07 15:32 ` Sergei Shtylylov
2006-02-07 15:32 ` Sergei Shtylylov
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