/dev/mem: remove redundant parameter from do_write_kmem()

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 868ff2c..be832b6 100644 (file)
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -461,7 +461,7 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
 
 
 static inline ssize_t
-do_write_kmem(void *p, unsigned long realp, const char __user * buf,
+do_write_kmem(unsigned long p, const char __user *buf,
              size_t count, loff_t *ppos)
 {
        ssize_t written, sz;
@@ -470,12 +470,11 @@ do_write_kmem(void *p, unsigned long realp, const char __user * buf,
        written = 0;
 #ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
        /* we don't have page 0 mapped on sparc and m68k.. */
-       if (realp < PAGE_SIZE) {
-               sz = size_inside_page(realp, count);
+       if (p < PAGE_SIZE) {
+               sz = size_inside_page(p, count);
                /* Hmm. Do something? */
                buf += sz;
                p += sz;
-               realp += sz;
                count -= sz;
                written += sz;
        }
@@ -484,14 +483,14 @@ do_write_kmem(void *p, unsigned long realp, const char __user * buf,
        while (count > 0) {
                char *ptr;
 
-               sz = size_inside_page(realp, count);
+               sz = size_inside_page(p, count);
 
                /*
                 * On ia64 if a page has been mapped somewhere as
                 * uncached, then it must also be accessed uncached
                 * by the kernel or data corruption may occur
                 */
-               ptr = xlate_dev_kmem_ptr(p);
+               ptr = xlate_dev_kmem_ptr((char *)p);
 
                copied = copy_from_user(ptr, buf, sz);
                if (copied) {
@@ -502,7 +501,6 @@ do_write_kmem(void *p, unsigned long realp, const char __user * buf,
                }
                buf += sz;
                p += sz;
-               realp += sz;
                count -= sz;
                written += sz;
        }
@@ -526,7 +524,7 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
        if (p < (unsigned long) high_memory) {
                unsigned long to_write = min_t(unsigned long, count,
                                               (unsigned long)high_memory - p);
-               wrote = do_write_kmem((void *)p, p, buf, to_write, ppos);
+               wrote = do_write_kmem(p, buf, to_write, ppos);
                if (wrote != to_write)
                        return wrote;
                p += wrote;