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doc: function prototype change workaround suggestion

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Joe Lawrence 2017-03-30 10:44:53 -04:00
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doc/patch-author-guide.md
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@ -342,7 +342,10 @@ When changing header files, be extra careful. If data is being changed, you
probably need to modify the patch. See "Data struct changes" above.
If a function prototype is being changed, make sure it's not an exported
function. Otherwise it could break out-of-tree modules.
function. Otherwise it could break out-of-tree modules. One way to
workaround this is to define an entirely new copy of the function (with
updated code) and patch in-tree callers to invoke it rather than the
deprecated version.
Many header file changes result in a complete rebuild of the kernel tree, which
makes kpatch-build have to compare every .o file in the kernel. It slows the