sysctl: use bitmap library functions

Use bitmap_set() instead of using set_bit() for each bit.  This conversion
is valid because the bitmap is private in the function call and atomic
bitops were unnecessary.

This also includes minor change.
- Use bitmap_copy() for shorter typing

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 5 deletions

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index d48ff4fd44c3..dbd70bdc1765 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -23,6 +23,7 @@
 #include <linux/swap.h>
 #include <linux/slab.h>
 #include <linux/sysctl.h>
+#include <linux/bitmap.h>
 #include <linux/signal.h>
 #include <linux/printk.h>
 #include <linux/proc_fs.h>
@@ -2393,9 +2394,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
                                 }
                         }
 
-                        while (val_a <= val_b)
-                                set_bit(val_a++, tmp_bitmap);
-
+                        bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
                         first = 0;
                         proc_skip_char(&kbuf, &left, '\n');
                 }
@@ -2438,8 +2437,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
                         if (*ppos)
                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
                         else
-                                memcpy(bitmap, tmp_bitmap,
-                                        BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
+                                bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
                 }
                 kfree(tmp_bitmap);
                 *lenp -= left;