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From: Jiri Slaby <jirislaby@gmail.com>
To: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org, rjw@sisk.pl,
	Linux kernel mailing list <linux-kernel@vger.kernel.org>,
	torvalds@linux-foundation.org
Subject: 2.6.29 acpi regression: acpi_ex_extract_from_field -- div by zero
Date: Sun, 15 Mar 2009 11:47:06 +0100	[thread overview]
Message-ID: <49BCDCAA.8040309@gmail.com> (raw)

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

             reply	other threads:[~2009-03-15 10:47 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-15 10:47 Jiri Slaby [this message]
2009-03-15 17:49 ` 2.6.29 acpi regression: acpi_ex_extract_from_field -- div by zero Linus Torvalds
2009-03-15 19:08 ` Moore, Robert
2009-03-15 19:32   ` Jiri Slaby
     [not found] ` <d3f22a0903152046m891dc0aq6ca01eed32a9eb32@mail.gmail.com>
2009-03-16  3:42   ` Lin Ming
2009-03-16 16:31     ` Jiri Slaby
2009-03-18  8:08       ` Jiri Slaby
2009-03-19 16:06         ` Jiri Slaby
2009-03-20  0:48           ` Lin Ming
2009-03-20  4:53           ` Lin Ming

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