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The string CONFIG_ quite often appears after other alphanumerics, meaning that that instance cannot be referencing a Kconfig symbol. Omitting these means make has fewer files to stat() when deciding what needs to be rebuilt - for a defconfig build, this seems to remove about 2% of the (wildcard ...) lines from the .o.cmd files. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>