AuxXxilium/linux_dsm_epyc7002
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x86: Use bitmap library functions

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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>
This commit is contained in:
Akinobu Mita 2011-02-16 23:48:35 +09:00 committed by Ingo Molnar
parent b82fef82d5
commit da1016df85
1 changed files with 5 additions and 15 deletions
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20
arch/x86/kernel/ioport.c
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@ -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,