linux-kernel - RE: 2.6.29 acpi regression: acpi_ex_extract_from

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Date:	Sun, 15 Mar 2009 12:08:10 -0700
From:	"Moore, Robert" <robert.moore@...el.com>
To:	Jiri Slaby <jirislaby@...il.com>, Len Brown <lenb@...nel.org>
CC:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"rjw@...k.pl" <rjw@...k.pl>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>
Subject: RE: 2.6.29 acpi regression: acpi_ex_extract_from_field -- div by
 zero

Can you please send or post the acpidump for the machine? Thanks.

>-----Original Message-----
>From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-
>owner@...r.kernel.org] On Behalf Of Jiri Slaby
>Sent: Sunday, March 15, 2009 3:47 AM
>To: Len Brown
>Cc: linux-acpi@...r.kernel.org; rjw@...k.pl; Linux kernel mailing list;
>torvalds@...ux-foundation.org
>Subject: 2.6.29 acpi regression: acpi_ex_extract_from_field -- div by zero
>
>Hi,
>
>sometimes, when booting up/resuming from disk, I get an oops[1].
>
>obj_desc->common_field.access_bit_width is zero, but even after the
>loop. Division before the loop is apparently OK.
>
>This is the case:
>         /* Mask off any extra bits in the last datum */
>
>         buffer_tail_bits = obj_desc->common_field.bit_length %
>             obj_desc->common_field.access_bit_width;
>
>.L39:
>         xorl    %edx, %edx      #
>         movzbl  37(%rbx), %esi  #
><variable>.common_field.access_bit_width,
><variable>.common_field.access_bit_width
>         movl    24(%rbx), %eax  # <variable>.common_field.bit_length,
><variable>.common_field.bit_length
>--------------- here:
>         divl    %esi    # <variable>.common_field.access_bit_width
>         movl    %edx, %ecx      #, tmp121
>         testl   %edx, %edx      # tmp121
>         je      .L41    #,
>
>[1] http://www.fi.muni.cz/~xslaby/sklad/panics/acpi_oops.png
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