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Introduce CONFIG_CHECK_SIGNATURE to control inclusion of check_signature() and avoid problems on platforms that don't have readb(). Let the few legacy (ISA || PCI || X86) drivers that need check_signature() select CONFIG_CHECK_SIGNATURE. Signed-off-by: Geert Uytterhoeven <[email protected]> Cc: Jeff Dike <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Roman Zippel <[email protected]> Cc: Alan Cox <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Russell King <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>