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----
-breadcrumbs:
-- - /chromium-os
- - Chromium OS
-- - /chromium-os/chromiumos-design-docs
- - Design Documents
-page_name: upstream-first
-title: Upstream First
----
-
-## Abstract
-
-This document outlines a process for managing the flow of kernel source patches
-between Chromium OS and hardware partners.
-
-## Goals
-
-Our goal with the "Upstream First" policy is to eliminate kernel version
-fragmentation.
-
-We know that hardware partners support other devices as well as Chromium
-OS-based devices. So rather than having partners target multiple kernels for
-multiple devices, we'd like to encourage them to target one kernel: the upstream
-kernel.
-
-By having everyone target a single kernel, we hope to avoid duplication of
-effort and get everyone (our hardware partners, their partners, and the upstream
-community) working together on improving a single set of patches. By working
-together, we can build a better kernel and avoid later having to rework changes
-that are incompatible with the upstream kernel.
-
-## Accepting patches
-
-A device driver patch must be accepted upstream before it can be accepted into
-the Chromium OS kernel. Ideally, the patch will be in Linus Torvalds's kernel
-tree before it is accepted into the Chromium OS kernel. However, other options
-are also available.
-
-The following list shows options for getting a patch accepted into the Chromium
-OS kernel. We encourage all partners to strive to attain option 1.
-
-**Patch options, ordered from high to low preference**
-
-1. The patch is accepted into Linus Torvalds's upstream tree.
-2. The patch is accepted into the subsystem maintainer tree (such as
- Dave Miller's netdev tree).
-3. The patch is accepted into the the device maintainer tree (such as
- samsung or msm) and a pull request has been sent to Linus Torvalds.
-
-After the patch is accepted into an upstream tree, Google will cherry-pick it
-into the Chromium OS kernel. If the patch requires backport work, Google will
-work with the vendor to do the backport.
-
-Exemptions are granted on a case-by-case basis. \ No newline at end of file