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kbuild: doc: remove description about grepping CONFIG options
This description was added 20 years ago [1]. It does not convey any useful information except for a feeling of nostalgia. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=65e433436b5794ae056d22ddba60fe9194bba007 Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nicolas Schier <n.schier@avm.de>
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@ -521,9 +521,3 @@ build.
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ext2-y := balloc.o bitmap.o dir.o
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ext2-$(CONFIG_EXT2_FS_XATTR) += xattr.o
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External modules have traditionally used "grep" to check for
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specific `CONFIG_` settings directly in .config. This usage is
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broken. As introduced before, external modules should use
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kbuild for building and can therefore use the same methods as
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in-tree modules when testing for `CONFIG_` definitions.
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