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