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generated by cgit v1.2.2 (git 2.25.0) at 2025-10-18 08:26:08 -0400
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/*
 * Contiguous Memory Allocator framework: Best Fit allocator
 * Copyright (c) 2010 by Samsung Electronics.
 * Written by Michal Nazarewicz (m.nazarewicz@samsung.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License or (at your optional) any later version of the license.
 */

#define pr_fmt(fmt) "cma: bf: " fmt

#ifdef CONFIG_CMA_DEBUG
#  define DEBUG
#endif

#include <linux/errno.h>       /* Error numbers */
#include <linux/slab.h>        /* kmalloc() */

#include <linux/cma.h>         /* CMA structures */


/************************* Data Types *************************/

struct cma_bf_item {
	struct cma_chunk ch;
	struct rb_node by_size;
};

struct cma_bf_private {
	struct rb_root by_start_root;
	struct rb_root by_size_root;
};


/************************* Prototypes *************************/

/*
 * Those are only for holes.  They must be called whenever hole's
 * properties change but also whenever chunk becomes a hole or hole
 * becames a chunk.
 */
static void __cma_bf_hole_insert_by_size(struct cma_bf_item *item);
static void __cma_bf_hole_erase_by_size(struct cma_bf_item *item);
static int  __must_check
__cma_bf_hole_insert_by_start(struct cma_bf_item *item);
static void __cma_bf_hole_erase_by_start(struct cma_bf_item *item);

/**
 * __cma_bf_hole_take - takes a chunk of memory out of a hole.