add more requirements for kernel patches

README.md

@@ -5,15 +5,18 @@
 ## Description
 This repository contains the scripts and patches to build the kernel for SONiC. SONiC uses the same kernel for all platforms. We prefer to out-of-tree kernel platform modules. We accept kernel patches on following conditions:
 
-- Existing kernel modules need to be enabled
-- Existing kernel modules need to be patched and those patches are available in upstream
-- New kernel modules which are common to all platforms
-- Platform specific kernel modules which are impossible or very difficul to be built out of kernel tree
+- Existing kernel modules need to be enabled.
+- Existing kernel modules need to be patched and those patches are available in upstream.
+  - Please include the original upstream commit id and message in the patch. This allows the maintainer to remove upstream patches during the kernel upgrade.
+- New kernel modules which are common to all platforms.
+- Platform specific kernel modules which are impossible or very difficul to be built out of kernel tree.
 
 Platform specific kernel modules are expected to develop out-of-tree kernel modules, provide them in debian packages to be embeded into SONiC ONE image and installed on their platforms.
 
+For all patches, please ensure you have run the patch with `checkpatch.pl` and pass it.
+
 Usage:
 
     make DEST=<destination path>
 
-If DEST is not set, package will stay in current directory
+If DEST is not set, package will stay in current directory.