Attachment 154141 Details for Bug 239050 – freedesktop.org DRM won't compile bug report

freedesktop.org DRM won't compile bug report

drm_bug.cgi.html (text/html), 30.04 KB, created by Calin Brabandt on 2007-05-04 17:04:09 UTC

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Created: 2007-05-04 17:04:09 UTC

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>    <h1>Bugzilla Bug 10576</h1>
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>    <h2>drm modules won't compile with 2.6.21-rc6 (vm_insert_pfn names clash)</h2>
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>    <h3>Last modified: 2007-04-28 18:00:13 PST</h3>
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>              <b>Opened:</b> 2007-04-09 10:18 PST
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><pre id="comment_text_0">It looks like that latest (as of writing <a href="mailto:2.6.21-rc6@kernel.org">2.6.21-rc6@kernel.org</a>) kernel contains
>function named vm_insert_pfn in /mm/memory.c and /mm/mm.h (see
><a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c</a>
> for specific check-in). Unfortunately vm_insert_pfn is also used in
>drm_compat.c thus resulting in naming clash. At a first glance they both differ
>in code very much. 
>
>The result of make is 
>/home/michal/nouveau/drm/linux-core/drm_compat.c:190: error: static declaration
>of âvm_insert_pfnâ follows non-static declaration
>include/linux/mm.h:1126: error: previous declaration of âvm_insert_pfnâ was
>here 
>
>The bug was found on Ubuntu Feisty with latest kernel packages installed (which
>apparently is 2.6.20. uname -r gives 2.6.20-14-generic) 2.6.20 from gentoo does
>not have this problem.
></pre>
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>        <span class="bz_comment">
>          ------- <i>Comment
>          <a name="c1" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c1">
>            #1</a> From 
>          <a href="mailto:michalsznajder@gmail.com">MichaÅ Sznajder</a>
>          2007-04-09 11:09:36 PST 
>          </i>
>          <script type="text/javascript"></script>[<a href="#add_comment" onclick="replyToComment(1);">reply</a>]
>          -------
>        </span>
>        
>
>
><pre id="comment_text_1">Links to drm and kernels git's  that have introduced incompatibility:
>
><a href="http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898">http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898</a>
>
><a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c</a>
>
>Someone has to change the name but who?
></pre>
>    </div>
>  <div>
>        <br>
>        <span class="bz_comment">
>          ------- <i>Comment
>          <a name="c2" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c2">
>            #2</a> From 
>          <a href="mailto:thomas@tungstengraphics.com">Thomas Hellstrï¿½m</a>
>          2007-04-09 11:27:28 PST 
>          </i>
>          <script type="text/javascript"></script>[<a href="#add_comment" onclick="replyToComment(2);">reply</a>]
>          -------
>        </span>
>        
>
>
><pre id="comment_text_2">(In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c1">comment #1</a>)
>&gt; Links to drm and kernels git's  that have introduced incompatibility:
>&gt; 
>&gt; <a href="http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898">http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898</a>
>&gt; 
>&gt; <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c</a>
>&gt; 
>&gt; Someone has to change the name but who?
>&gt; 
>
>vm_insert_pfn first appears in the kernel in the 2.6.21-rc series.
>In drm_compat.c it is not included if the kernel version &gt;= 2.6.21, when the
>symbol DRM_FULL_MM_COMPAT is defined. 
>
>The semantics of the two functions, although they are looking very different
>are the same. The one in the mainstream kernel should be used if there is a
>clash.
>
>I'm not sure why it appears in Ubuntu 2.6.20. I think you need to ask the
>Ubuntu guys. 
>
>/Thomas
>
>
></pre>
>    </div>
>  <div>
>        <br>
>        <span class="bz_comment">
>          ------- <i>Comment
>          <a name="c3" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c3">
>            #3</a> From 
>          <a href="mailto:chris-fdbugs@printf.net">Chris Ball</a>
>          2007-04-27 15:34:47 PST 
>          </i>
>          <script type="text/javascript"></script>[<a href="#add_comment" onclick="replyToComment(3);">reply</a>]
>          -------
>        </span>
>        
>
>
><pre id="comment_text_3">(In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c2">comment #2</a>)
>&gt; I'm not sure why it appears in Ubuntu 2.6.20. I think you need to ask the
>&gt; Ubuntu guys. 
>
>It's hardly uncommon for a distro to choose a kernel (2.6.20), and then pull
>selectively from patches intended for a newer release without updating their
>kernel version to describe itself as that newer release (which it isn't).
>
>What would you have the Ubuntu maintainers do instead?
></pre>
>    </div>
>  <div>
>        <br>
>        <span class="bz_comment">
>          ------- <i>Comment
>          <a name="c4" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c4">
>            #4</a> From 
>          <a href="mailto:thomas@tungstengraphics.com">Thomas Hellstrï¿½m</a>
>          2007-04-28 13:50:17 PST 
>          </i>
>          <script type="text/javascript"></script>[<a href="#add_comment" onclick="replyToComment(4);">reply</a>]
>          -------
>        </span>
>        
>
>
><pre id="comment_text_4">(In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c3">comment #3</a>)
>&gt; (In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c2">comment #2</a>)
>&gt; &gt; I'm not sure why it appears in Ubuntu 2.6.20. I think you need to ask the
>&gt; &gt; Ubuntu guys. 
>&gt; It's hardly uncommon for a distro to choose a kernel (2.6.20), and then pull
>&gt; selectively from patches intended for a newer release without updating their
>&gt; kernel version to describe itself as that newer release (which it isn't).
>&gt; What would you have the Ubuntu maintainers do instead?
>
>Actually I think that's fine. I cant really figure out why they would want to
>pull vm_insert_pfn, since AFAICT it is only used by DRM and cell, but anyway
>they are free to do what they want.
>
>The more important question raised here is what are the DRM developers expected
>to do about this? Should we maintain compatibility with all more or less
>selectively patched kernels from all distros?
>
>Thomas
></pre>
>    </div>
>  <div>
>        <br>
>        <span class="bz_comment">
>          ------- <i>Comment
>          <a name="c5" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c5">
>            #5</a> From 
>          <a href="mailto:airlied@freedesktop.org">Dave Airlie</a>
>          2007-04-28 18:00:13 PST 
>          </i>
>          <script type="text/javascript"></script>[<a href="#add_comment" onclick="replyToComment(5);">reply</a>]
>          -------
>        </span>
>        
>
>
><pre id="comment_text_5">We used to do this, but it takes a fair bit of effort... and I really couldn't
>be bothered, I run ubuntu here and I just ifdef around it rather than try to
>figure out what they did to their kernel..
></pre>
>    </div>
>
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    <h1>Bugzilla Bug 10576</h1>

    <h2>drm modules won't compile with 2.6.21-rc6 (vm_insert_pfn names clash)</h2>

    <h3>Last modified: 2007-04-28 18:00:13 PST</h3>
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          <tbody><tr>
            <td align="right">
              <b>Bug#:</b>
            </td>
            <td>
              <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576">10576</a>
            </td>
          </tr>

            <tr>
              <td align="right">
                <b>Alias:</b>
              </td>
              <td>
                <label for="alias" title="a name for the bug that can be used in place of its ID number, f.e. when adding it to a list of dependencies">
                  <input id="alias" name="alias" value="" size="20" maxlength="20">
                </label>
              </td>
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            <td align="right">
              <b><u>P</u>roduct:</b>
            </td><td>
    <label for="product" accesskey="p">
      <select name="product" id="product">
          <option value="burn">burn
          </option>
          <option value="cairo">cairo
          </option>
          <option value="cairo-java">cairo-java
          </option>
          <option value="cairomm">cairomm
          </option>
          <option value="create">create
          </option>
          <option value="dbus">dbus
          </option>
          <option value="DejaVu">DejaVu
          </option>
          <option value="desktop-file-utils">desktop-file-utils
          </option>
          <option value="DRI" selected="selected">DRI
          </option>
          <option value="Farsight">Farsight
          </option>
          <option value="fontconfig">fontconfig
          </option>
          <option value="freedesktop.org">freedesktop.org
          </option>
          <option value="freedrtools">freedrtools
          </option>
          <option value="FriBidi">FriBidi
          </option>
          <option value="Galago">Galago
          </option>
          <option value="ghns">ghns
          </option>
          <option value="GTK-Qt Engine">GTK-Qt Engine
          </option>
          <option value="hal">hal
          </option>
          <option value="HarfBuzz">HarfBuzz
          </option>
          <option value="Hieroglyph">Hieroglyph
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          <option value="LDTP">LDTP
          </option>
          <option value="liboil">liboil
          </option>
          <option value="libopenraw">libopenraw
          </option>
          <option value="libpixman">libpixman
          </option>
          <option value="LTSP">LTSP
          </option>
          <option value="Mesa">Mesa
          </option>
          <option value="nice">nice
          </option>
          <option value="nickle">nickle
          </option>
          <option value="openclipart.org">openclipart.org
          </option>
          <option value="openfontlibrary">openfontlibrary
          </option>
          <option value="pkg-config">pkg-config
          </option>
          <option value="pm-utils">pm-utils
          </option>
          <option value="PolicyKit">PolicyKit
          </option>
          <option value="poppler">poppler
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          </option>
          <option value="swfdec">swfdec
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          <option value="Telepathy">Telepathy
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          <option value="tinderbox">tinderbox
          </option>
          <option value="UIM">UIM
          </option>
          <option value="XCB">XCB
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          <option value="xdgmime">xdgmime
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                <a href="http://bugs.freedesktop.org/describecomponents.cgi?product=DRI">
                  Co<u>m</u>ponent</a>:
              </b>
            </td><td>
    <label for="component" accesskey="m">
      <select name="component" id="component">
          <option value="DRM modules" selected="selected">DRM modules
          </option>
          <option value="General">General
          </option>
          <option value="libdrm">libdrm
          </option>
          <option value="libGL">libGL
          </option>
          <option value="libglx">libglx
          </option>
      </select>
    </label>
  </td>
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            <td align="right">
              <b>
                <a href="http://bugs.freedesktop.org/page.cgi?id=fields.html#status">Status</a>:
              </b>
            </td>
            <td>RESOLVED</td>
          </tr>

          <tr>
            <td align="right">
              <b>
                <a href="http://bugs.freedesktop.org/page.cgi?id=fields.html#resolution">Resolution</a>:
              </b>
            </td>
            <td>NOTABUG
            </td>
          </tr>

          <tr>
            <td align="right">
              <b>
                <a href="http://bugs.freedesktop.org/page.cgi?id=fields.html#assigned_to">Assigned&nbsp;To</a>:
              </b>
            </td>
            <td>Default DRI bug account &lt;dri-devel@lists.sourceforge.net&gt;</td>
          </tr>

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      <td valign="top">

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          </option>
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          </option>
          <option value="other">other
          </option>
      </select>
    </label>
  </td>
          </tr>

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              <b>Version:</b>
            </td><td>
    <label for="version" accesskey="o">
      <select name="version" id="version">
          <option value="DRI CVS" selected="selected">DRI CVS
          </option>
          <option value="unspecified">unspecified
          </option>
          <option value="XFree86 4.4.0">XFree86 4.4.0
          </option>
          <option value="XFree86 CVS">XFree86 CVS
          </option>
          <option value="XOrg 6.7.0">XOrg 6.7.0
          </option>
          <option value="XOrg CVS">XOrg CVS
          </option>
      </select>
    </label>
  </td>
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              <b><a href="http://bugs.freedesktop.org/page.cgi?id=fields.html#priority">Pr<u>i</u>ority</a>:</b>
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              <b><a href="http://bugs.freedesktop.org/page.cgi?id=fields.html#bug_severity">Severity</a>:</b>
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          <option value="blocker">blocker
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          <option value="normal" selected="selected">normal
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        </tbody></table>
      </td>

      <td valign="top">

        <table cellpadding="1" cellspacing="1">

          <tbody><tr>
            <td align="right">
              <b>Reporter:</b>
            </td>
            <td>
              <a href="mailto:michalsznajder@gmail.com">MichaÅ Sznajder &lt;michalsznajder@gmail.com&gt;</a>
            </td>
          </tr>

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              <b><a name="c0" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c0">
                Description</a>:</b>&nbsp;&nbsp;<script type="text/javascript"><!-- 
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              <b>Opened:</b> 2007-04-09 10:18 PST
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<pre id="comment_text_0">It looks like that latest (as of writing <a href="mailto:2.6.21-rc6@kernel.org">2.6.21-rc6@kernel.org</a>) kernel contains
function named vm_insert_pfn in /mm/memory.c and /mm/mm.h (see
<a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c</a>
 for specific check-in). Unfortunately vm_insert_pfn is also used in
drm_compat.c thus resulting in naming clash. At a first glance they both differ
in code very much. 

The result of make is 
/home/michal/nouveau/drm/linux-core/drm_compat.c:190: error: static declaration
of âvm_insert_pfnâ follows non-static declaration
include/linux/mm.h:1126: error: previous declaration of âvm_insert_pfnâ was
here 

The bug was found on Ubuntu Feisty with latest kernel packages installed (which
apparently is 2.6.20. uname -r gives 2.6.20-14-generic) 2.6.20 from gentoo does
not have this problem.
</pre>
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          ------- <i>Comment
          <a name="c1" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c1">
            #1</a> From 
          <a href="mailto:michalsznajder@gmail.com">MichaÅ Sznajder</a>
          2007-04-09 11:09:36 PST 
          </i>
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<pre id="comment_text_1">Links to drm and kernels git's  that have introduced incompatibility:

<a href="http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898">http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898</a>

<a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c</a>

Someone has to change the name but who?
</pre>
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          ------- <i>Comment
          <a name="c2" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c2">
            #2</a> From 
          <a href="mailto:thomas@tungstengraphics.com">Thomas Hellstrï¿½m</a>
          2007-04-09 11:27:28 PST 
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<pre id="comment_text_2">(In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c1">comment #1</a>)
&gt; Links to drm and kernels git's  that have introduced incompatibility:
&gt; 
&gt; <a href="http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898">http://gitweb.freedesktop.org/?p=mesa/drm.git;a=commitdiff;h=f2db76e2f206d2017f710eaddc4b33add4498898</a>
&gt; 
&gt; <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e0dc0d8f4a327d033bfb63d43f113d5f31d11b3c</a>
&gt; 
&gt; Someone has to change the name but who?
&gt; 

vm_insert_pfn first appears in the kernel in the 2.6.21-rc series.
In drm_compat.c it is not included if the kernel version &gt;= 2.6.21, when the
symbol DRM_FULL_MM_COMPAT is defined. 

The semantics of the two functions, although they are looking very different
are the same. The one in the mainstream kernel should be used if there is a
clash.

I'm not sure why it appears in Ubuntu 2.6.20. I think you need to ask the
Ubuntu guys. 

/Thomas


</pre>
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          <a name="c3" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c3">
            #3</a> From 
          <a href="mailto:chris-fdbugs@printf.net">Chris Ball</a>
          2007-04-27 15:34:47 PST 
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<pre id="comment_text_3">(In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c2">comment #2</a>)
&gt; I'm not sure why it appears in Ubuntu 2.6.20. I think you need to ask the
&gt; Ubuntu guys. 

It's hardly uncommon for a distro to choose a kernel (2.6.20), and then pull
selectively from patches intended for a newer release without updating their
kernel version to describe itself as that newer release (which it isn't).

What would you have the Ubuntu maintainers do instead?
</pre>
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        <span class="bz_comment">
          ------- <i>Comment
          <a name="c4" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c4">
            #4</a> From 
          <a href="mailto:thomas@tungstengraphics.com">Thomas Hellstrï¿½m</a>
          2007-04-28 13:50:17 PST 
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<pre id="comment_text_4">(In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c3">comment #3</a>)
&gt; (In reply to <a href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c2">comment #2</a>)
&gt; &gt; I'm not sure why it appears in Ubuntu 2.6.20. I think you need to ask the
&gt; &gt; Ubuntu guys. 
&gt; It's hardly uncommon for a distro to choose a kernel (2.6.20), and then pull
&gt; selectively from patches intended for a newer release without updating their
&gt; kernel version to describe itself as that newer release (which it isn't).
&gt; What would you have the Ubuntu maintainers do instead?

Actually I think that's fine. I cant really figure out why they would want to
pull vm_insert_pfn, since AFAICT it is only used by DRM and cell, but anyway
they are free to do what they want.

The more important question raised here is what are the DRM developers expected
to do about this? Should we maintain compatibility with all more or less
selectively patched kernels from all distros?

Thomas
</pre>
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        <span class="bz_comment">
          ------- <i>Comment
          <a name="c5" href="http://bugs.freedesktop.org/show_bug.cgi?id=10576#c5">
            #5</a> From 
          <a href="mailto:airlied@freedesktop.org">Dave Airlie</a>
          2007-04-28 18:00:13 PST 
          </i>
          <script type="text/javascript"><!-- 
            addReplyLink(5); //--></script>[<a href="#add_comment" onclick="replyToComment(5);">reply</a>]
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<pre id="comment_text_5">We used to do this, but it takes a fair bit of effort... and I really couldn't
be bothered, I run ubuntu here and I just ifdef around it rather than try to
figure out what they did to their kernel..
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