+ mm-slubc-switch-to-bitmap_zalloc.patch added to -mm tree

[akpm@xxxxxxxxxxxxxxxxxxxx]

The patch titled
     Subject: mm/slub.c: switch to bitmap_zalloc()
has been added to the -mm tree.  Its filename is
     mm-slubc-switch-to-bitmap_zalloc.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-slubc-switch-to-bitmap_zalloc.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-slubc-switch-to-bitmap_zalloc.patch

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------------------------------------------------------
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Subject: mm/slub.c: switch to bitmap_zalloc()

Switch to bitmap_zalloc() to show clearly what we are allocating.  Besides
that it returns pointer of bitmap type instead of opaque void *.

Link: http://lkml.kernel.org/r/20180830104301.61649-1-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---


diff -puN mm/slub.c~mm-slubc-switch-to-bitmap_zalloc mm/slub.c
--- a/mm/slub.c~mm-slubc-switch-to-bitmap_zalloc
+++ a/mm/slub.c
@@ -3622,9 +3622,7 @@ static void list_slab_objects(struct kme
 #ifdef CONFIG_SLUB_DEBUG
 	void *addr = page_address(page);
 	void *p;
-	unsigned long *map = kcalloc(BITS_TO_LONGS(page->objects),
-				     sizeof(long),
-				     GFP_ATOMIC);
+	unsigned long *map = bitmap_zalloc(page->objects, GFP_ATOMIC);
 	if (!map)
 		return;
 	slab_err(s, page, text, s->name);
@@ -3639,7 +3637,7 @@ static void list_slab_objects(struct kme
 		}
 	}
 	slab_unlock(page);
-	kfree(map);
+	bitmap_free(map);
 #endif
 }
 
@@ -4412,10 +4410,8 @@ static long validate_slab_cache(struct k
 {
 	int node;
 	unsigned long count = 0;
-	unsigned long *map = kmalloc_array(BITS_TO_LONGS(oo_objects(s->max)),
-					   sizeof(unsigned long),
-					   GFP_KERNEL);
 	struct kmem_cache_node *n;
+	unsigned long *map = bitmap_alloc(oo_objects(s->max), GFP_KERNEL);
 
 	if (!map)
 		return -ENOMEM;
@@ -4423,7 +4419,7 @@ static long validate_slab_cache(struct k
 	flush_all(s);
 	for_each_kmem_cache_node(s, node, n)
 		count += validate_slab_node(s, n, map);
-	kfree(map);
+	bitmap_free(map);
 	return count;
 }
 /*
@@ -4574,14 +4570,12 @@ static int list_locations(struct kmem_ca
 	unsigned long i;
 	struct loc_track t = { 0, 0, NULL };
 	int node;
-	unsigned long *map = kmalloc_array(BITS_TO_LONGS(oo_objects(s->max)),
-					   sizeof(unsigned long),
-					   GFP_KERNEL);
 	struct kmem_cache_node *n;
+	unsigned long *map = bitmap_alloc(oo_objects(s->max), GFP_KERNEL);
 
 	if (!map || !alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location),
 				     GFP_KERNEL)) {
-		kfree(map);
+		bitmap_free(map);
 		return sprintf(buf, "Out of memory\n");
 	}
 	/* Push back cpu slabs */
@@ -4647,7 +4641,7 @@ static int list_locations(struct kmem_ca
 	}
 
 	free_loc_track(&t);
-	kfree(map);
+	bitmap_free(map);
 	if (!t.count)
 		len += sprintf(buf, "No data\n");
 	return len;
_

Patches currently in -mm which might be from andriy.shevchenko@xxxxxxxxxxxxxxx are

mm-slubc-switch-to-bitmap_zalloc.patch