1 Linux Kernel patch submission checklist
2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 Here are some basic things that developers should do if they want to see their
5 kernel patch submissions accepted more quickly.
7 These are all above and beyond the documentation that is provided in
8 Documentation/SubmittingPatches and elsewhere regarding submitting Linux
12 1: If you use a facility then #include the file that defines/declares
13 that facility. Don't depend on other header files pulling in ones
16 2: Builds cleanly with applicable or modified CONFIG options =y, =m, and
17 =n. No gcc warnings/errors, no linker warnings/errors.
19 2b: Passes allnoconfig, allmodconfig
21 2c: Builds successfully when using O=builddir
23 3: Builds on multiple CPU architectures by using local cross-compile tools
24 or some other build farm.
26 4: ppc64 is a good architecture for cross-compilation checking because it
27 tends to use `unsigned long' for 64-bit quantities.
29 5: Check your patch for general style as detailed in
30 Documentation/CodingStyle. Check for trivial violations with the
31 patch style checker prior to submission (scripts/checkpatch.pl).
32 You should be able to justify all violations that remain in
35 6: Any new or modified CONFIG options don't muck up the config menu.
37 7: All new Kconfig options have help text.
39 8: Has been carefully reviewed with respect to relevant Kconfig
40 combinations. This is very hard to get right with testing -- brainpower
43 9: Check cleanly with sparse.
45 10: Use 'make checkstack' and 'make namespacecheck' and fix any problems
46 that they find. Note: checkstack does not point out problems explicitly,
47 but any one function that uses more than 512 bytes on the stack is a
50 11: Include kernel-doc to document global kernel APIs. (Not required for
51 static functions, but OK there also.) Use 'make htmldocs' or 'make
52 mandocs' to check the kernel-doc and fix any issues.
54 12: Has been tested with CONFIG_PREEMPT, CONFIG_DEBUG_PREEMPT,
55 CONFIG_DEBUG_SLAB, CONFIG_DEBUG_PAGEALLOC, CONFIG_DEBUG_MUTEXES,
56 CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_SPINLOCK_SLEEP all simultaneously
59 13: Has been build- and runtime tested with and without CONFIG_SMP and
62 14: If the patch affects IO/Disk, etc: has been tested with and without
65 15: All codepaths have been exercised with all lockdep features enabled.
67 16: All new /proc entries are documented under Documentation/
69 17: All new kernel boot parameters are documented in
70 Documentation/kernel-parameters.txt.
72 18: All new module parameters are documented with MODULE_PARM_DESC()
74 19: All new userspace interfaces are documented in Documentation/ABI/.
75 See Documentation/ABI/README for more information.
76 Patches that change userspace interfaces should be CCed to
77 linux-api@vger.kernel.org.
79 20: Check that it all passes `make headers_check'.
81 21: Has been checked with injection of at least slab and page-allocation
82 failures. See Documentation/fault-injection/.
84 If the new code is substantial, addition of subsystem-specific fault
85 injection might be appropriate.
87 22: Newly-added code has been compiled with `gcc -W' (use "make
88 EXTRA_CFLAGS=-W"). This will generate lots of noise, but is good for
89 finding bugs like "warning: comparison between signed and unsigned".
91 23: Tested after it has been merged into the -mm patchset to make sure
92 that it still works with all of the other queued patches and various
93 changes in the VM, VFS, and other subsystems.
95 24: All memory barriers {e.g., barrier(), rmb(), wmb()} need a comment in the
96 source code that explains the logic of what they are doing and why.
98 25: If any ioctl's are added by the patch, then also update
99 Documentation/ioctl/ioctl-number.txt.
101 26: If your modified source code depends on or uses any of the kernel
102 APIs or features that are related to the following kconfig symbols,
103 then test multiple builds with the related kconfig symbols disabled
104 and/or =m (if that option is available) [not all of these at the
105 same time, just various/random combinations of them]:
107 CONFIG_SMP, CONFIG_SYSFS, CONFIG_PROC_FS, CONFIG_INPUT, CONFIG_PCI,
108 CONFIG_BLOCK, CONFIG_PM, CONFIG_HOTPLUG, CONFIG_MAGIC_SYSRQ,
109 CONFIG_NET, CONFIG_INET=n (but latter with CONFIG_NET=y)