A Linux kernel maintainer is responsible for a defined part of the kernel—such as a file, driver, or subsystem—and is listed for that area in the kernel’s MAINTAINERS file. The job is active code ownership: reviewing patches, coordinating changes, and responding to bugs and regressions, not simply receiving credit for past work.
What a kernel maintainer is responsible for
The kernel’s Code of Conduct interpretation defines a maintainer as someone responsible for a subsystem, driver, or file who is listed in MAINTAINERS. The file is intended as a working map of responsibility, not a historical credits list.
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The exact scope varies. One person may look after a small driver; another may coordinate a subsystem with substantial patch and bug-report traffic. The kernel maintainer guidance recommends at least two maintainers for an area where possible, so work can be shared and does not stop when someone is away.
Review and integration
Maintainers review patches that exclusively affect the code they maintain. They assess whether a change addresses the stated problem, fits the code and its interfaces, and is ready to integrate. They also guide refactoring and core changes so maintained code continues to work with evolving kernel infrastructure.
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Review is part of a continuing responsibility, not a one-time gate. If a review or validation is taking longer than expected, maintainers are expected to communicate the delay and give contributors an indication of timing.
Bug and regression response
Maintainers help ensure serious problems in their area are resolved promptly. This includes kernel crashes, warnings, compilation failures, lockups, data loss, and comparable regressions. The workload depends on the code’s size and popularity: a small driver may need occasional attention, while a widely used subsystem can generate steady review and bug-response work.
How a patch reaches the mainline kernel
Kernel changes commonly travel through a subsystem tree before they reach the mainline tree. A subsystem maintainer has overall responsibility for that code, but review and integration involve contributors and other developers as well. The kernel submission guide describes Linus Torvalds as the final arbiter of changes accepted into mainline.
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- Prepare a focused change. Contributors use Git and should start from an appropriate mainline or subsystem tree. Each patch should address one problem and explain the underlying issue and its user-visible impact.
- Find the right recipients. Check
MAINTAINERSand relevant source history to identify the appropriate maintainer and mailing list. Copy the relevant recipients when submitting. - Test and document it. Contributors are asked to test their changes, compile multiple configurations, run
scripts/checkpatch.pl, and document known bugs. - Submit with the required sign-off. Include a
Signed-off-byline under the Developer’s Certificate of Origin, then send the patch to the appropriate maintainers and lists for review. - Respond to review and integration. Review may lead to revisions or further validation before a subsystem tree integrates the change and it proceeds toward mainline.
Being listed as a recipient does not mean a maintainer works alone or that every patch follows an identical schedule. The documented workflow is hierarchical, and review timing depends on the code area and the work involved.
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How to read the MAINTAINERS file
An entry can identify who should receive patches, who is designated to review them, which mailing list is relevant, and the area’s support status. These fields help contributors route a change and set expectations about the code’s support.
| Field | Meaning |
|---|---|
M |
Person to whom patches should be mailed. |
R |
Designated reviewer. |
L |
Relevant mailing list. |
S |
Status of the code area. Values include Supported, Maintained, Odd Fixes, Orphan, and Obsolete. |
Use the entry for the specific files or subsystem involved rather than assuming that one maintainer handles every part of the kernel.
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What changes for stable-kernel fixes
Stable-kernel patches follow a review path in addition to the ordinary subsystem workflow. Accepted fixes enter a queue for review by other developers and the relevant subsystem maintainer. Under the stable-kernel rules, the stable review committee has 48 hours to ACK or NAK a patch. Accepted patches are then posted in release candidates so developers and testers can validate them before a stable release.
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The role combines technical judgment with reliable communication. A maintainer needs to understand the code they own, evaluate changes and their risks, coordinate with contributors and reviewers, and stay engaged when bugs or regressions surface. How demanding that is depends heavily on the scope and activity of the maintained area.
There is no role-wide published figure in the cited kernel guidance for how many maintainers there are, how many hours the role takes, what maintainers are paid, or what percentage of submitted patches are accepted. Those figures should not be inferred from the title: kernel maintenance is organized around individual code areas and their workloads.
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