cregit-Linux how code gets into the kernel

Release 4.18 lib/crc-t10dif.c

Directory: lib
/*
 * T10 Data Integrity Field CRC16 calculation
 *
 * Copyright (c) 2007 Oracle Corporation.  All rights reserved.
 * Written by Martin K. Petersen <martin.petersen@oracle.com>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2. See the file COPYING for more details.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/crc-t10dif.h>
#include <linux/err.h>
#include <linux/init.h>
#include <crypto/hash.h>
#include <linux/static_key.h>


static struct crypto_shash *crct10dif_tfm;

static struct static_key crct10dif_fallback __read_mostly;


__u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len) { struct { struct shash_desc shash; char ctx[2]; } desc; int err; if (static_key_false(&crct10dif_fallback)) return crc_t10dif_generic(crc, buffer, len); desc.shash.tfm = crct10dif_tfm; desc.shash.flags = 0; *(__u16 *)desc.ctx = crc; err = crypto_shash_update(&desc.shash, buffer, len); BUG_ON(err); return *(__u16 *)desc.ctx; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu8275.23%350.00%
Martin K. Petersen2018.35%116.67%
Akinobu Mita65.50%116.67%
Tim Chen10.92%116.67%
Total109100.00%6100.00%

EXPORT_SYMBOL(crc_t10dif_update);
__u16 crc_t10dif(const unsigned char *buffer, size_t len) { return crc_t10dif_update(0, buffer, len); }

Contributors

PersonTokensPropCommitsCommitProp
Akinobu Mita24100.00%1100.00%
Total24100.00%1100.00%

EXPORT_SYMBOL(crc_t10dif);
static int __init crc_t10dif_mod_init(void) { crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0); if (IS_ERR(crct10dif_tfm)) { static_key_slow_inc(&crct10dif_fallback); crct10dif_tfm = NULL; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu42100.00%2100.00%
Total42100.00%2100.00%


static void __exit crc_t10dif_mod_fini(void) { crypto_free_shash(crct10dif_tfm); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu14100.00%1100.00%
Total14100.00%1100.00%

module_init(crc_t10dif_mod_init); module_exit(crc_t10dif_mod_fini); MODULE_DESCRIPTION("T10 DIF CRC calculation"); MODULE_LICENSE("GPL"); MODULE_SOFTDEP("pre: crct10dif");

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu17567.83%350.00%
Martin K. Petersen4718.22%116.67%
Akinobu Mita3513.57%116.67%
Tim Chen10.39%116.67%
Total258100.00%6100.00%
Directory: lib
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