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authorAkinobu Mita <akinobu.mita@gmail.com>2011-02-16 23:48:35 +0900
committerIngo Molnar <mingo@elte.hu>2011-02-17 14:59:22 +0100
commitda1016df85ed67b6f7dbb765532c54bc35ba08d7 (patch)
tree4bfae45b4ca0513c38cdf9d542291b846c67fd02 /arch/x86/kernel/ioport.c
parentb82fef82d56789439e6be638a87a1a5bba1e6e75 (diff)
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>
Diffstat (limited to 'arch/x86/kernel/ioport.c')
-rw-r--r--arch/x86/kernel/ioport.c20
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,