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+  <div class="section" id="op-build-stable-tree-rules-and-releases">
+<span id="stable-rules"></span><h1>op-build stable tree rules and releases<a class="headerlink" href="#op-build-stable-tree-rules-and-releases" title="Permalink to this headline">¶</a></h1>
+<p>Our stable tree process follows processes similar to other open source projects
+such as the Linux Kernel and Buildroot, as do several OpenPOWER Firmware
+components such as Skiboot and Petitboot.</p>
+<p>The purpose of a -stable tree is to give vendors a stable base to create
+firmware releases from and to incorporate into service packs. New stable
+releases contain critical fixes only.</p>
+<p>As a general rule, only the most recent op-build release gets a maintained
+-stable tree. If you wish to maintain an older tree, speak up! For example,
+with my IBMer hat on, we’ll maintain branches that we ship in products.</p>
+<div class="section" id="what-patches-are-accepted">
+<h2>What patches are accepted?<a class="headerlink" href="#what-patches-are-accepted" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li>Patches must be obviously correct and tested<ul>
+<li>A Tested-by signoff is <em>important</em></li>
+</ul>
+</li>
+<li>A patch must fix a real bug</li>
+<li>No trivial patches, such fixups belong in main branch</li>
+<li>Not fix a purely theoretical problem unless you can prove how
+it’s exploitable</li>
+<li>The patch, or an equivalent one, must already be in master<ul>
+<li>Submitting to both at the same time is okay, but back-porting is better</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="howto-submit-to-stable">
+<h2>HOWTO submit to stable<a class="headerlink" href="#howto-submit-to-stable" title="Permalink to this headline">¶</a></h2>
+<ol class="arabic">
+<li><p class="first">Make a pull request with “[stable op-build-N.N.y]” in subject (where N.N.y
+is the stable branch to which you are targeting)</p>
+<ul>
+<li><p class="first">This targets the patch <em>ONLY</em> to the stable branch.</p>
+<ul class="simple">
+<li>Such commits will <em>NOT</em> be merged into master.</li>
+</ul>
+</li>
+<li><p class="first">Use this when:</p>
+<ol class="loweralpha simple">
+<li>cherry-picking a fix from master</li>
+<li>fixing something that is only broken in stable</li>
+<li>fix in stable needs to be completely different than in master</li>
+</ol>
+<p>If b or c: explain why.</p>
+</li>
+<li><p class="first">If cherry-picking, include the following at the top of your
+commit message (or use the -x option to git-cherry-pick):</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">commit</span> <span class="o">&lt;</span><span class="n">sha1</span><span class="o">&gt;</span> <span class="n">upstream</span><span class="o">.</span>
+</pre></div>
+</div>
+</li>
+<li><p class="first">If the patch has been modified, explain why in description.</p>
+</li>
+</ul>
+</li>
+<li><p class="first">Add a comment on the PR indicating that a PR should also go to a stable
+branch when making a Pull request to master</p>
+<ul class="simple">
+<li>This targets the patch to master and stable.</li>
+<li>You can target a patch to a specific stable tree by putting that in the
+comment</li>
+<li>You can ask for prerequisites to be cherry-picked.</li>
+</ul>
+</li>
+</ol>
+</div>
+<div class="section" id="trees">
+<h2>Trees<a class="headerlink" href="#trees" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li><a class="reference external" href="https://github.com/open-power/op-build/">https://github.com/open-power/op-build/</a> (or via ssh at <code class="docutils literal notranslate"><span class="pre">git&#64;github.com:open-power/op-build.git</span></code> )<ul>
+<li>(branches are op-build-X.Y.y - e.g. op-build-2.0.y)</li>
+</ul>
+</li>
+<li>Some stable versions may last longer than others<ul>
+<li>So there may be op-build-2.0.y and op-build-2.4.y actively maintained
+and op-build-2.0.y could possibly outlast op-build-2.4.y.</li>
+</ul>
+</li>
+</ul>
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