cregit-Linux how code gets into the kernel

Release 4.8 sound/synth/util_mem.c

Directory: sound/synth
/*
 *  Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
 *
 *  Generic memory management routines for soundcard memory allocation
 *
 *   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 option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/util_mem.h>

MODULE_AUTHOR("Takashi Iwai");
MODULE_DESCRIPTION("Generic memory management routines for soundcard memory allocation");
MODULE_LICENSE("GPL");


#define get_memblk(p)	list_entry(p, struct snd_util_memblk, list)

/*
 * create a new memory manager
 */

struct snd_util_memhdr * snd_util_memhdr_new(int memsize) { struct snd_util_memhdr *hdr; hdr = kzalloc(sizeof(*hdr), GFP_KERNEL); if (hdr == NULL) return NULL; hdr->size = memsize; mutex_init(&hdr->block_mutex); INIT_LIST_HEAD(&hdr->block); return hdr; }

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jaroslav kyselajaroslav kysela5690.32%125.00%
takashi iwaitakashi iwai58.06%250.00%
ingo molnaringo molnar11.61%125.00%
Total62100.00%4100.00%

/* * free a memory manager */
void snd_util_memhdr_free(struct snd_util_memhdr *hdr) { struct list_head *p; if (!hdr) return; /* release all blocks */ while ((p = hdr->block.next) != &hdr->block) { list_del(p); kfree(get_memblk(p)); } kfree(hdr); }

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jaroslav kyselajaroslav kysela5186.44%133.33%
takashi iwaitakashi iwai813.56%266.67%
Total59100.00%3100.00%

/* * allocate a memory block (without mutex) */
struct snd_util_memblk * __snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size) { struct snd_util_memblk *blk; unsigned int units, prev_offset; struct list_head *p; if (snd_BUG_ON(!hdr || size <= 0)) return NULL; /* word alignment */ units = size; if (units & 1) units++; if (units > hdr->size) return NULL; /* look for empty block */ prev_offset = 0; list_for_each(p, &hdr->block) { blk = get_memblk(p); if (blk->offset - prev_offset >= units) goto __found; prev_offset = blk->offset + blk->size; } if (hdr->size - prev_offset < units) return NULL; __found: return __snd_util_memblk_new(hdr, units, p->prev); }

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jaroslav kyselajaroslav kysela12185.82%133.33%
takashi iwaitakashi iwai2014.18%266.67%
Total141100.00%3100.00%

/* * create a new memory block with the given size * the block is linked next to prev */
struct snd_util_memblk * __snd_util_memblk_new(struct snd_util_memhdr *hdr, unsigned int units, struct list_head *prev) { struct snd_util_memblk *blk; blk = kmalloc(sizeof(struct snd_util_memblk) + hdr->block_extra_size, GFP_KERNEL); if (blk == NULL) return NULL; if (prev == &hdr->block) blk->offset = 0; else { struct snd_util_memblk *p = get_memblk(prev); blk->offset = p->offset + p->size; } blk->size = units; list_add(&blk->list, prev); hdr->nblocks++; hdr->used += units; return blk; }

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jaroslav kyselajaroslav kysela11090.16%150.00%
takashi iwaitakashi iwai129.84%150.00%
Total122100.00%2100.00%

/* * allocate a memory block (with mutex) */
struct snd_util_memblk * snd_util_mem_alloc(struct snd_util_memhdr *hdr, int size) { struct snd_util_memblk *blk; mutex_lock(&hdr->block_mutex); blk = __snd_util_mem_alloc(hdr, size); mutex_unlock(&hdr->block_mutex); return blk; }

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jaroslav kyselajaroslav kysela4083.33%133.33%
takashi iwaitakashi iwai612.50%133.33%
ingo molnaringo molnar24.17%133.33%
Total48100.00%3100.00%

/* * remove the block from linked-list and free resource * (without mutex) */
void __snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk) { list_del(&blk->list); hdr->nblocks--; hdr->used -= blk->size; kfree(blk); }

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jaroslav kyselajaroslav kysela3790.24%150.00%
takashi iwaitakashi iwai49.76%150.00%
Total41100.00%2100.00%

/* * free a memory block (with mutex) */
int snd_util_mem_free(struct snd_util_memhdr *hdr, struct snd_util_memblk *blk) { if (snd_BUG_ON(!hdr || !blk)) return -EINVAL; mutex_lock(&hdr->block_mutex); __snd_util_mem_free(hdr, blk); mutex_unlock(&hdr->block_mutex); return 0; }

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jaroslav kyselajaroslav kysela3766.07%125.00%
takashi iwaitakashi iwai1730.36%250.00%
ingo molnaringo molnar23.57%125.00%
Total56100.00%4100.00%

/* * return available memory size */
int snd_util_mem_avail(struct snd_util_memhdr *hdr) { unsigned int size; mutex_lock(&hdr->block_mutex); size = hdr->size - hdr->used; mutex_unlock(&hdr->block_mutex); return size; }

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jaroslav kyselajaroslav kysela3990.70%133.33%
takashi iwaitakashi iwai24.65%133.33%
ingo molnaringo molnar24.65%133.33%
Total43100.00%3100.00%

EXPORT_SYMBOL(snd_util_memhdr_new); EXPORT_SYMBOL(snd_util_memhdr_free); EXPORT_SYMBOL(snd_util_mem_alloc); EXPORT_SYMBOL(snd_util_mem_free); EXPORT_SYMBOL(snd_util_mem_avail); EXPORT_SYMBOL(__snd_util_mem_alloc); EXPORT_SYMBOL(__snd_util_mem_free); EXPORT_SYMBOL(__snd_util_memblk_new); /* * INIT part */
static int __init alsa_util_mem_init(void) { return 0; }

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jaroslav kyselajaroslav kysela12100.00%1100.00%
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static void __exit alsa_util_mem_exit(void) { }

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jaroslav kyselajaroslav kysela8100.00%1100.00%
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module_init(alsa_util_mem_init) module_exit(alsa_util_mem_exit)

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jaroslav kyselajaroslav kysela60287.25%228.57%
takashi iwaitakashi iwai7510.87%342.86%
ingo molnaringo molnar101.45%114.29%
paul gortmakerpaul gortmaker30.43%114.29%
Total690100.00%7100.00%
Directory: sound/synth
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