MIPS: math-emu: Use the bitmap API to allocate bitmaps

Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.

It is less verbose and it improves the semantic.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/math-emu/dsemul.c

@@ -82,11 +82,8 @@ static int alloc_emuframe(void)
 
 	/* Ensure we have an allocation bitmap */
 	if (!mm_ctx->bd_emupage_allocmap) {
-		mm_ctx->bd_emupage_allocmap =
-			kcalloc(BITS_TO_LONGS(emupage_frame_count),
-					      sizeof(unsigned long),
-				GFP_ATOMIC);
-
+		mm_ctx->bd_emupage_allocmap = bitmap_zalloc(emupage_frame_count,
+							    GFP_ATOMIC);
 		if (!mm_ctx->bd_emupage_allocmap) {
 			idx = BD_EMUFRAME_NONE;
 			goto out_unlock;
@@ -206,7 +203,7 @@ void dsemul_mm_cleanup(struct mm_struct *mm)
 {
 	mm_context_t *mm_ctx = &mm->context;
 
-	kfree(mm_ctx->bd_emupage_allocmap);
+	bitmap_free(mm_ctx->bd_emupage_allocmap);
 }
 
 int mips_dsemul(struct pt_regs *regs, mips_instruction ir,