x86: use for_each_clear_bit_from()

Use for_each_clear_bit() to iterate over all the cleared bit in a
memory region.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 313fb5c..43e2b1c 100644 (file)
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -306,10 +306,10 @@ void __init native_init_IRQ(void)
         * us. (some of these will be overridden and become
         * 'special' SMP interrupts)
         */
-       for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
+       i = FIRST_EXTERNAL_VECTOR;
+       for_each_clear_bit_from(i, used_vectors, NR_VECTORS) {
                /* IA32_SYSCALL_VECTOR could be used in trap_init already. */
-               if (!test_bit(i, used_vectors))
-                       set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]);
+               set_intr_gate(i, interrupt[i - FIRST_EXTERNAL_VECTOR]);
        }
 
        if (!acpi_ioapic && !of_ioapic)