[PATCH] ppc64: trivial sparse cleanups

This patch squashes a handful of assorted sparse warnings in the ppc64
code.  Should be pretty much trivial and self explanatory.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/nvram.c

@@ -77,7 +77,7 @@ static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
 }
 
 
-static ssize_t dev_nvram_read(struct file *file, char *buf,
+static ssize_t dev_nvram_read(struct file *file, char __user *buf,
 			  size_t count, loff_t *ppos)
 {
 	ssize_t len;
@@ -117,7 +117,7 @@ static ssize_t dev_nvram_read(struct file *file, char *buf,
 
 }
 
-static ssize_t dev_nvram_write(struct file *file, const char *buf,
+static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
 			   size_t count, loff_t *ppos)
 {
 	ssize_t len;

arch/ppc64/kernel/setup.c

@@ -1301,7 +1301,7 @@ static int __init early_xmon(char *p)
 {
 	/* ensure xmon is enabled */
 	xmon_init();
-	debugger(0);
+	debugger(NULL);
 
 	return 0;
 }

arch/ppc64/mm/hash_utils.c

@@ -401,7 +401,7 @@ void low_hash_fault(struct pt_regs *regs, unsigned long address)
 		info.si_signo = SIGBUS;
 		info.si_errno = 0;
 		info.si_code = BUS_ADRERR;
-		info.si_addr = (void *)address;
+		info.si_addr = (void __user *)address;
 		force_sig_info(SIGBUS, &info, current);
 		return;
 	}

arch/ppc64/mm/hugetlbpage.c

@@ -249,7 +249,7 @@ int prepare_hugepage_range(unsigned long addr, unsigned long len)
 {
 	if (within_hugepage_high_range(addr, len))
 		return 0;
-	else if ((addr < 0x100000000) && ((addr+len) < 0x100000000)) {
+	else if ((addr < 0x100000000UL) && ((addr+len) < 0x100000000UL)) {
 		int err;
 		/* Yes, we need both tests, in case addr+len overflows
 		 * 64-bit arithmetic */