#!/bin/sh# SPDX-License-Identifier: GPL-2.0-only set -e # Detect files that are tracked but ignored by git.check_tracked_ignored_files () {	git -C "${srctree:-.}" ls-files -i -c --exclude-per-directory=.gitignore 2>/dev/null |		sed 's/$/: warning: ignored by one of the .gitignore files/' >&2} # Check for missing #include <linux/export.h>## The rule for including <linux/export.h> is very simple:# Include <linux/export.h> only when you use EXPORT_SYMBOL(). That's it.## However, some headers include <linux/export.h> even though they are completely# unrelated to EXPORT_SYMBOL().## One example is include/linux/module.h. Please note <linux/module.h> and# <linux/export.h> are orthogonal. <linux/module.h> should be included by files# that can be compiled as modules. In other words, <linux/module.h> should be# included by EXPORT_SYMBOL consumers. In contrast, <linux/export.h> should be# included from EXPORT_SYMBOL providers, which may or may not be modular.# Hence, include/linux/module.h should *not* include <linux/export.h>.## Another example is include/linux/linkage.h, which is completely unrelated to# EXPORT_SYMBOL(). Worse, it is included by most C files, which means, most C# files end up including <linux/export.h>, even though only some of them# actually export symbols. Hence, include/linux/linkage.h should *not* include# <linux/export.h>.## Before fixing such headers, we must ensure that C files using EXPORT_SYMBOL()# include <linux/export.h> directly, since many C files currently rely on# <linux/export.h> being included indirectly (likely, via <linux/linkage> etc.).## Therefore, this check.## The problem is simple - the warned files use EXPORT_SYMBOL(), but do not# include <linux/export.h>. Please add #include <linux/export.h> to them.## If the included headers are sorted alphabetically, please insert# <linux/export.h> in the appropriate position to maintain the sort order.# For this reason, this script only checks missing <linux/export.h>, but# does not automatically fix it.check_missing_include_linux_export_h () { 	git -C "${srctree:-.}" grep --files-with-matches -E 'EXPORT_SYMBOL((_NS)?(_GPL)?|_GPL_FOR_MODULES)\(.*\)' \	    -- '*.[ch]' :^tools/ :^include/linux/export.h |	xargs -r git -C "${srctree:-.}" grep --files-without-match '#include[[:space:]]*<linux/export\.h>' |	xargs -r printf "%s: warning: EXPORT_SYMBOL() is used, but #include <linux/export.h> is missing\n" >&2} # If you do not use EXPORT_SYMBOL(), please do not include <linux/export.h>.# Currently, this is checked for *.c files, but not for *.h files, because some# *.c files rely on <linux/export.h> being included indirectly.check_unnecessary_include_linux_export_h () { 	git -C "${srctree:-.}" grep --files-with-matches '#include[[:space:]]*<linux/export\.h>' \	    -- '*.[c]' :^tools/ |	xargs -r git -C "${srctree:-.}" grep --files-without-match -E 'EXPORT_SYMBOL((_NS)?(_GPL)?|_GPL_FOR_MODULES)\(.*\)' |	xargs -r printf "%s: warning: EXPORT_SYMBOL() is not used, but #include <linux/export.h> is present\n" >&2} case "${KBUILD_EXTRA_WARN}" in*1*)	check_tracked_ignored_files	;;esac case "${KBUILD_EXTRA_WARN}" in*2*)	check_missing_include_linux_export_h	check_unnecessary_include_linux_export_h	;;esac