[PATCH x86 for review II] [6/39] i386: romsignature/checksum cleanup

[Andi Kleen <ak@suse.de>]

From: Rene Herman <rene.herman@gmail.com>

Use adding __init to romsignature() (it's only called from probe_roms()
which is itself __init) as an excuse to submit a pedantic cleanup.

Signed-off-by: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 arch/i386/kernel/e820.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

Index: linux/arch/i386/kernel/e820.c
===================================================================
--- linux.orig/arch/i386/kernel/e820.c
+++ linux/arch/i386/kernel/e820.c
@@ -157,21 +157,22 @@ static struct resource standard_io_resou
 	.flags	= IORESOURCE_BUSY | IORESOURCE_IO
 } };
 
-static int romsignature(const unsigned char *x)
+#define ROMSIGNATURE 0xaa55
+
+static int __init romsignature(const unsigned char *rom)
 {
 	unsigned short sig;
-	int ret = 0;
-	if (probe_kernel_address((const unsigned short *)x, sig) == 0)
-		ret = (sig == 0xaa55);
-	return ret;
+
+	return probe_kernel_address((const unsigned short *)rom, sig) == 0 &&
+	       sig == ROMSIGNATURE;
 }
 
 static int __init romchecksum(unsigned char *rom, unsigned long length)
 {
-	unsigned char *p, sum = 0;
+	unsigned char sum;
 
-	for (p = rom; p < rom + length; p++)
-		sum += *p;
+	for (sum = 0; length; length--)
+		sum += *rom++;
 	return sum == 0;
 }