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

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Date:	Mon, 12 Feb 2007 08:37:52 +0100 (CET)
From:	Andi Kleen <ak@...e.de>
To:	Rene Herman <rene.herman@...il.com>, Andi Kleen <ak@...e.de>,
	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH x86 for review II] [6/39] i386: romsignature/checksum cleanup


From: Rene Herman <rene.herman@...il.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@...il.com>
Signed-off-by: Andi Kleen <ak@...e.de>
Cc: Andi Kleen <ak@...e.de>
Signed-off-by: Andrew Morton <akpm@...l.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;
 }
 
-
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