394 lines
14 KiB
HTML
394 lines
14 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Submitting patches</title>
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<link rel="stylesheet" type="text/css" href="mesa.css">
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</head>
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<body>
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<div class="header">
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<h1>The Mesa 3D Graphics Library</h1>
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</div>
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<iframe src="contents.html"></iframe>
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<div class="content">
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<h1>Submitting patches</h1>
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<ul>
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<li><a href="#guidelines">Basic guidelines</a>
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<li><a href="#formatting">Patch formatting</a>
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<li><a href="#testing">Testing Patches</a>
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<li><a href="#mailing">Mailing Patches</a>
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<li><a href="#reviewing">Reviewing Patches</a>
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<li><a href="#nominations">Nominating a commit for a stable branch</a>
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<li><a href="#criteria">Criteria for accepting patches to the stable branch</a>
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<li><a href="#backports">Sending backports for the stable branch</a>
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<li><a href="#gittips">Git tips</a>
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</ul>
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<h2 id="guidelines">Basic guidelines</h2>
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<ul>
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<li>Patches should not mix code changes with code formatting changes (except,
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perhaps, in very trivial cases.)
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<li>Code patches should follow Mesa
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<a href="codingstyle.html" target="_parent">coding conventions</a>.
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<li>Whenever possible, patches should only affect individual Mesa/Gallium
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components.
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<li>Patches should never introduce build breaks and should be bisectable (see
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<code>git bisect</code>.)
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<li>Patches should be properly <a href="#formatting">formatted</a>.
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<li>Patches should be sufficiently <a href="#testing">tested</a> before submitting.
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<li>Patches should be submitted to <a href="#mailing">mesa-dev</a>
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for <a href="#reviewing">review</a> using <code>git send-email</code>.
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</ul>
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<h2 id="formatting">Patch formatting</h2>
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<ul>
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<li>Lines should be limited to 75 characters or less so that git logs
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displayed in 80-column terminals avoid line wrapping. Note that git
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log uses 4 spaces of indentation (4 + 75 < 80).
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<li>The first line should be a short, concise summary of the change prefixed
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with a module name. Examples:
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<pre>
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mesa: Add support for querying GL_VERTEX_ATTRIB_ARRAY_LONG
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gallium: add PIPE_CAP_DEVICE_RESET_STATUS_QUERY
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i965: Fix missing type in local variable declaration.
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</pre>
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<li>Subsequent patch comments should describe the change in more detail,
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if needed. For example:
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<pre>
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i965: Remove end-of-thread SEND alignment code.
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This was present in Eric's initial implementation of the compaction code
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for Sandybridge (commit 077d01b6). There is no documentation saying this
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is necessary, and removing it causes no regressions in piglit on any
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platform.
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</pre>
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<li>A "Signed-off-by:" line is not required, but not discouraged either.
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<li>If a patch addresses a bugzilla issue, that should be noted in the
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patch comment. For example:
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<pre>
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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89689
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</pre>
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<li>If a patch addresses a issue introduced with earlier commit, that should be
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noted in the patch comment. For example:
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<pre>
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Fixes: d7b3707c612 "util/disk_cache: use stat() to check if entry is a directory"
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</pre>
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<li>If there have been several revisions to a patch during the review
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process, they should be noted such as in this example:
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<pre>
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st/mesa: add ARB_texture_stencil8 support (v4)
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if we support stencil texturing, enable texture_stencil8
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there is no requirement to support native S8 for this,
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the texture can be converted to x24s8 fine.
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v2: fold fixes from Marek in:
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a) put S8 last in the list
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b) fix renderable to always test for d/s renderable
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fixup the texture case to use a stencil only format
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for picking the format for the texture view.
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v3: hit fallback for getteximage
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v4: put s8 back in front, it shouldn't get picked now (Ilia)
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</pre>
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<li>If someone tested your patch, document it with a line like this:
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<pre>
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Tested-by: Joe Hacker <jhacker@foo.com>
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</pre>
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<li>If the patch was reviewed (usually the case) or acked by someone,
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that should be documented with:
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<pre>
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Reviewed-by: Joe Hacker <jhacker@foo.com>
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Acked-by: Joe Hacker <jhacker@foo.com>
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</pre>
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<li>If sending later revision of a patch, add all the tags - ack, r-b,
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Cc: mesa-stable and/or other. This provides reviewers with quick feedback if the
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patch has already been reviewed.
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<li>In order for your patch to reach the prospective reviewer easier/faster,
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use the script scripts/get_reviewer.pl to get a list of individuals and include
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them in the CC list.
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<br>
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Please use common sense and do <strong>not</strong> blindly add everyone.
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<br>
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<pre>
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$ scripts/get_reviewer.pl --help # to get the help screen
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$ scripts/get_reviewer.pl -f src/egl/drivers/dri2/platform_android.c
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Rob Herring <robh@kernel.org> (reviewer:ANDROID EGL SUPPORT,added_lines:188/700=27%,removed_lines:58/283=20%)
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Tomasz Figa <tfiga@chromium.org> (reviewer:ANDROID EGL SUPPORT,authored:12/41=29%,added_lines:308/700=44%,removed_lines:115/283=41%)
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Emil Velikov <emil.l.velikov@gmail.com> (authored:13/41=32%,removed_lines:76/283=27%)
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</pre>
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</ul>
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<h2 id="testing">Testing Patches</h2>
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<p>
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It should go without saying that patches must be tested. In general,
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do whatever testing is prudent.
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</p>
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<p>
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You should always run the Mesa test suite before submitting patches.
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The test suite can be run using the 'make check' command. All tests
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must pass before patches will be accepted, this may mean you have
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to update the tests themselves.
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</p>
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<p>
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Whenever possible and applicable, test the patch with
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<a href="https://piglit.freedesktop.org">Piglit</a> and/or
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<a href="https://android.googlesource.com/platform/external/deqp/">dEQP</a>
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to check for regressions.
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</p>
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<p>
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As mentioned at the begining, patches should be bisectable.
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A good way to test this is to make use of the `git rebase` command,
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to run your tests on each commit. Assuming your branch is based off
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<code>origin/master</code>, you can run:
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<pre>
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$ git rebase --interactive --exec "make check" origin/master
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</pre>
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replacing <code>"make check"</code> with whatever other test you want to
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run.
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</p>
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<h2 id="mailing">Mailing Patches</h2>
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<p>
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Patches should be sent to the mesa-dev mailing list for review:
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<a href="https://lists.freedesktop.org/mailman/listinfo/mesa-dev">
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mesa-dev@lists.freedesktop.org</a>.
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When submitting a patch make sure to use
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<a href="https://git-scm.com/docs/git-send-email">git send-email</a>
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rather than attaching patches to emails. Sending patches as
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attachments prevents people from being able to provide in-line review
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comments.
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</p>
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<p>
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When submitting follow-up patches you can use --in-reply-to to make v2, v3,
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etc patches show up as replies to the originals. This usually works well
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when you're sending out updates to individual patches (as opposed to
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re-sending the whole series). Using --in-reply-to makes
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it harder for reviewers to accidentally review old patches.
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</p>
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<p>
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When submitting follow-up patches you should also login to
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<a href="https://patchwork.freedesktop.org">patchwork</a> and change the
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state of your old patches to Superseded.
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</p>
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<p>
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Some companies' mail server automatically append a legal disclaimer,
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usually containing something along the lines of "The information in this
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email is confidential" and "distribution is strictly prohibited".<br/>
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These legal notices prevent us from being able to accept your patch,
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rendering the whole process pointless. Please make sure these are
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disabled before sending your patches. (Note that you may need to contact
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your email administrator for this.)
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</p>
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<h2 id="reviewing">Reviewing Patches</h2>
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<p>
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When you've reviewed a patch on the mailing list, please be unambiguous
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about your review. That is, state either
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</p>
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<pre>
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Reviewed-by: Joe Hacker <jhacker@foo.com>
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</pre>
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or
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<pre>
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Acked-by: Joe Hacker <jhacker@foo.com>
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</pre>
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<p>
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Rather than saying just "LGTM" or "Seems OK".
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</p>
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<p>
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If small changes are suggested, it's OK to say something like:
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</p>
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<pre>
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With the above fixes, Reviewed-by: Joe Hacker <jhacker@foo.com>
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</pre>
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<p>
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which tells the patch author that the patch can be committed, as long
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as the issues are resolved first.
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</p>
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<h2 id="nominations">Nominating a commit for a stable branch</h2>
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<p>
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There are three ways to nominate a patch for inclusion in the stable branch and
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release.
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</p>
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<ul>
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<li> By adding the Cc: mesa-stable@ tag as described below.
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<li> Sending the commit ID (as seen in master branch) to the mesa-stable@ mailing list.
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<li> Forwarding the patch from the mesa-dev@ mailing list.
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</li>
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</ul>
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<p>
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Note: resending patch identical to one on mesa-dev@ or one that differs only
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by the extra mesa-stable@ tag is <strong>not</strong> recommended.
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</p>
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<p>
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If you are not the author of the original patch, please Cc: them in your
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nomination request.
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</p>
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<p>
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The current patch status can be observed in the <a href="releasing.html#stagingbranch">staging branch</a>.
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</p>
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<h3 id="thetag">The stable tag</h3>
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<p>
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If you want a commit to be applied to a stable branch,
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you should add an appropriate note to the commit message.
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</p>
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<p>
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Here are some examples of such a note:
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</p>
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<ul>
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<li>CC: <mesa-stable@lists.freedesktop.org></li>
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</ul>
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Simply adding the CC to the mesa-stable list address is adequate to nominate
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the commit for all the active stable branches. If the commit is not applicable
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for said branch the stable-release manager will reply stating so.
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This "CC" syntax for patch nomination will cause patches to automatically be
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copied to the mesa-stable@ mailing list when you use "git send-email" to send
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patches to the mesa-dev@ mailing list. If you prefer using --suppress-cc that
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won't have any negative effect on the patch nomination.
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<p>
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Note: by removing the tag [as the commit is pushed] the patch is
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<strong>explicitly</strong> rejected from inclusion in the stable branch(es).
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<br>
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Thus, drop the line <strong>only</strong> if you want to cancel the nomination.
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</p>
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Alternatively, if one uses the "Fixes" tag as described in the "Patch formatting"
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section, it nominates a commit for all active stable branches that include the
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commit that is referred to.
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<h2 id="criteria">Criteria for accepting patches to the stable branch</h2>
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Mesa has a designated release manager for each stable branch, and the release
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manager is the only developer that should be pushing changes to these branches.
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Everyone else should nominate patches using the mechanism described above.
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The following rules define which patches are accepted and which are not. The
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stable-release manager is also given broad discretion in rejecting patches
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that have been nominated.
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<ul>
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<li>Patch must conform with the <a href="#guidelines">Basic guidelines</a></li>
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<li>Patch must have landed in master first. In case where the original
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patch is too large and/or otherwise contradicts with the rules set within, a
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backport is appropriate.</li>
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<li>It must not introduce a regression - be that build or runtime wise.
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Note: If the regression is due to faulty piglit/dEQP/CTS/other test the
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latter must be fixed first. A reference to the offending test(s) and
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respective fix(es) should be provided in the nominated patch.</li>
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<li>Patch cannot be larger than 100 lines.</li>
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<li>Patches that move code around with no functional change should be
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rejected.</li>
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<li>Patch must be a bug fix and not a new feature.
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Note: An exception to this rule, are hardware-enabling "features". For
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example, <a href="#backports">backports</a> of new code to support a
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newly-developed hardware product can be accepted if they can be reasonably
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determined not to have effects on other hardware.</li>
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<li>Patch must be reviewed, For example, the commit message has Reviewed-by,
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Signed-off-by, or Tested-by tags from someone but the author.</li>
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<li>Performance patches are considered only if they provide information
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about the hardware, program in question and observed improvement. Use numbers
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to represent your measurements.</li>
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</ul>
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If the patch complies with the rules it will be
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<a href="releasing.html#pickntest">cherry-picked</a>. Alternatively the release
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manager will reply to the patch in question stating why the patch has been
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rejected or would request a backport.
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A summary of all the picked/rejected patches will be presented in the
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<a href="releasing.html#prerelease">pre-release</a> announcement.
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The stable-release manager may at times need to force-push changes to the
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stable branches, for example, to drop a previously-picked patch that was later
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identified as causing a regression). These force-pushes may cause changes to
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be lost from the stable branch if developers push things directly. Consider
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yourself warned.
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<h2 id="backports">Sending backports for the stable branch</h2>
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By default merge conflicts are resolved by the stable-release manager. In which
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case he/she should provide a comment about the changes required, alongside the
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<code>Conflicts</code> section. Summary of which will be provided in the
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<a href="releasing.html#prerelease">pre-release</a> announcement.
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<br>
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Developers are interested in sending backports are recommended to use either a
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<code>[BACKPORT #branch]</code> subject prefix or provides similar information
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within the commit summary.
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<h2 id="gittips">Git tips</h2>
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<ul>
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<li><code>git rebase -i ...</code> is your friend. Don't be afraid to use it.
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<li>Apply a fixup to commit FOO.
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<pre>
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git add ...
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git commit --fixup=FOO
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git rebase -i --autosquash ...
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</pre>
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<li>Test for build breakage between patches e.g last 8 commits.
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<pre>
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git rebase -i --exec="make -j4" HEAD~8
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</pre>
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<li>Sets the default mailing address for your repo.
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<pre>
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git config --local sendemail.to mesa-dev@lists.freedesktop.org
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</pre>
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<li> Add version to subject line of patch series in this case for the last 8
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commits before sending.
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<pre>
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git send-email --subject-prefix="PATCH v4" HEAD~8
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git send-email -v4 @~8 # shorter version, inherited from git format-patch
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</pre>
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<li> Configure git to use the get_reviewer.pl script interactively. Thus you
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can avoid adding the world to the CC list.
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<pre>
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git config sendemail.cccmd "./scripts/get_reviewer.pl -i"
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</pre>
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</ul>
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</div>
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</body>
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</html>
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