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uninline check_signature()

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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>
This commit is contained in:
Andrew Morton 2007-07-15 23:41:38 -07:00 committed by Linus Torvalds
parent 4e7bd66318
commit cc2ea416b2
3 changed files with 29 additions and 28 deletions
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29
include/linux/io.h
View File

@ -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 */

2
lib/Makefile
View File

@ -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

26
lib/check_signature.c Normal file
View File

@ -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);