All of lore.kernel.org
 help / color / mirror / Atom feed
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

  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=43E2BC1F.7080505@ru.mvista.com \
    --to=sshtylyov@ru.mvista.com \
    --cc=anemo@mba.ocn.ne.jp \
    --cc=linux-mips@linux-mips.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.