cxl: 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.

Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/59010cc7c62443030c69cb1ce0b2b62c5d47e064.1657566849.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/cxl/context.c

@@ -331,7 +331,7 @@ static void reclaim_ctx(struct rcu_head *rcu)
 		__free_page(ctx->ff_page);
 	ctx->sstp = NULL;
 
-	kfree(ctx->irq_bitmap);
+	bitmap_free(ctx->irq_bitmap);
 
 	/* Drop ref to the afu device taken during cxl_context_init */
 	cxl_afu_put(ctx->afu);

drivers/misc/cxl/guest.c

@@ -1053,7 +1053,7 @@ static void free_adapter(struct cxl *adapter)
 		if (adapter->guest->irq_avail) {
 			for (i = 0; i < adapter->guest->irq_nranges; i++) {
 				cur = &adapter->guest->irq_avail[i];
-				kfree(cur->bitmap);
+				bitmap_free(cur->bitmap);
 			}
 			kfree(adapter->guest->irq_avail);
 		}

drivers/misc/cxl/irq.c

@@ -319,8 +319,7 @@ int afu_allocate_irqs(struct cxl_context *ctx, u32 count)
 	}
 
 	ctx->irq_count = count;
-	ctx->irq_bitmap = kcalloc(BITS_TO_LONGS(count),
-				  sizeof(*ctx->irq_bitmap), GFP_KERNEL);
+	ctx->irq_bitmap = bitmap_zalloc(count, GFP_KERNEL);
 	if (!ctx->irq_bitmap)
 		goto out;
 

drivers/misc/cxl/of.c

@@ -308,8 +308,7 @@ static int read_adapter_irq_config(struct cxl *adapter, struct device_node *np)
 		cur = &adapter->guest->irq_avail[i];
 		cur->offset = be32_to_cpu(ranges[i * 2]);
 		cur->range  = be32_to_cpu(ranges[i * 2 + 1]);
-		cur->bitmap = kcalloc(BITS_TO_LONGS(cur->range),
-				sizeof(*cur->bitmap), GFP_KERNEL);
+		cur->bitmap = bitmap_zalloc(cur->range, GFP_KERNEL);
 		if (cur->bitmap == NULL)
 			goto err;
 		if (cur->offset < adapter->guest->irq_base_offset)
@@ -326,7 +325,7 @@ static int read_adapter_irq_config(struct cxl *adapter, struct device_node *np)
 err:
 	for (i--; i >= 0; i--) {
 		cur = &adapter->guest->irq_avail[i];
-		kfree(cur->bitmap);
+		bitmap_free(cur->bitmap);
 	}
 	kfree(adapter->guest->irq_avail);
 	adapter->guest->irq_avail = NULL;