uninline check_signature()

This is a rather bizarre thing to have inlined in io.h.  Stick it in lib/
instead.

While we're there, despaghetti it a bit, and fix its off-by-one behaviour when
passed a zero length.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/io.h

@@ -63,32 +63,7 @@ void __iomem * devm_ioremap(struct device *dev, unsigned long offset,
 void __iomem * devm_ioremap_nocache(struct device *dev, unsigned long offset,
 				    unsigned long size);
 void devm_iounmap(struct device *dev, void __iomem *addr);
-
-/**
- *	check_signature		-	find BIOS signatures
- *	@io_addr: mmio address to check
- *	@signature:  signature block
- *	@length: length of signature
- *
- *	Perform a signature comparison with the mmio address io_addr. This
- *	address should have been obtained by ioremap.
- *	Returns 1 on a match.
- */
-
-static inline int check_signature(const volatile void __iomem *io_addr,
-	const unsigned char *signature, int length)
-{
-	int retval = 0;
-	do {
-		if (readb(io_addr) != *signature)
-			goto out;
-		io_addr++;
-		signature++;
-		length--;
-	} while (length);
-	retval = 1;
-out:
-	return retval;
-}
+int check_signature(const volatile void __iomem *io_addr,
+			const unsigned char *signature, int length);
 
 #endif /* _LINUX_IO_H */

lib/Makefile

@@ -13,7 +13,7 @@ lib-$(CONFIG_SMP) += cpumask.o
 lib-y	+= kobject.o kref.o kobject_uevent.o klist.o
 
 obj-y += div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
-	 bust_spinlocks.o hexdump.o
+	 bust_spinlocks.o hexdump.o check_signature.o
 
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG

lib/check_signature.c

@@ -0,0 +1,26 @@
+#include <linux/io.h>
+#include <linux/module.h>
+
+/**
+ *	check_signature		-	find BIOS signatures
+ *	@io_addr: mmio address to check
+ *	@signature:  signature block
+ *	@length: length of signature
+ *
+ *	Perform a signature comparison with the mmio address io_addr. This
+ *	address should have been obtained by ioremap.
+ *	Returns 1 on a match.
+ */
+
+int check_signature(const volatile void __iomem *io_addr,
+			const unsigned char *signature, int length)
+{
+	while (length--) {
+		if (readb(io_addr) != *signature)
+			return 0;
+		io_addr++;
+		signature++;
+	}
+	return 1;
+}
+EXPORT_SYMBOL(check_signature);