Commit-ID: da1016df85ed67b6f7dbb765532c54bc35ba08d7
Gitweb: http://git.kernel.org/tip/da1016df85ed67b6f7dbb765532c54bc35ba08d7
Author: Akinobu Mita <akinobu.mita@xxxxxxxxx>
AuthorDate: Wed, 16 Feb 2011 23:48:35 +0900
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 17 Feb 2011 14:59:22 +0100
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@xxxxxxxxx>
LKML-Reference: <1297867715-20394-1-git-send-email-akinobu.mita@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/kernel/ioport.c | 20 +++++---------------
1 files changed, 5 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 8eec0ec..8c96897 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,
--
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