x86: Use bitmap library functions

Use bitmap_set()/bitmap_clear() to fill/zero a region of a
bitmap instead of doing set_bit()/clear_bit() each bit.

This change has been tested with ioperm() and there's no
change in behavior.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
LKML-Reference: <1297867715-20394-1-git-send-email-akinobu.mita@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 15 deletions

diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 8eec0ec59af2..8c968974253d 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -14,22 +14,9 @@
 #include <linux/slab.h>
 #include <linux/thread_info.h>
 #include <linux/syscalls.h>
+#include <linux/bitmap.h>
 #include <asm/syscalls.h>
 
-/* Set EXTENT bits starting at BASE in BITMAP to value TURN_ON. */
-static void set_bitmap(unsigned long *bitmap, unsigned int base,
-                       unsigned int extent, int new_value)
-{
-        unsigned int i;
-
-        for (i = base; i < base + extent; i++) {
-                if (new_value)
-                        __set_bit(i, bitmap);
-                else
-                        __clear_bit(i, bitmap);
-        }
-}
-
 /*
  * this changes the io permissions bitmap in the current task.
  */
@@ -69,7 +56,10 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
          */
         tss = &per_cpu(init_tss, get_cpu());
 
-        set_bitmap(t->io_bitmap_ptr, from, num, !turn_on);
+        if (turn_on)
+                bitmap_clear(t->io_bitmap_ptr, from, num);
+        else
+                bitmap_set(t->io_bitmap_ptr, from, num);
 
         /*
          * Search for a (possibly new) maximum. This is simple and stupid,