Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/fs/pstore/ram.c

  1 /*
  2  * RAM Oops/Panic logger
  3  *
  4  * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
  5  * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * version 2 as published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful, but
 12  * WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 14  * General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 19  * 02110-1301 USA
 20  *
 21  */
 22 
 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 24 
 25 #include <linux/kernel.h>
 26 #include <linux/err.h>
 27 #include <linux/module.h>
 28 #include <linux/version.h>
 29 #include <linux/pstore.h>
 30 #include <linux/time.h>
 31 #include <linux/io.h>
 32 #include <linux/ioport.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/slab.h>
 35 #include <linux/compiler.h>
 36 #include <linux/pstore_ram.h>
 37 
 38 #define RAMOOPS_KERNMSG_HDR "===="
 39 #define MIN_MEM_SIZE 4096UL
 40 
 41 static ulong record_size = MIN_MEM_SIZE;
 42 module_param(record_size, ulong, 0400);
 43 MODULE_PARM_DESC(record_size,
 44                 "size of each dump done on oops/panic");
 45 
 46 static ulong ramoops_console_size = MIN_MEM_SIZE;
 47 module_param_named(console_size, ramoops_console_size, ulong, 0400);
 48 MODULE_PARM_DESC(console_size, "size of kernel console log");
 49 
 50 static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
 51 module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
 52 MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
 53 
 54 static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
 55 module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
 56 MODULE_PARM_DESC(pmsg_size, "size of user space message log");
 57 
 58 static ulong mem_address;
 59 module_param(mem_address, ulong, 0400);
 60 MODULE_PARM_DESC(mem_address,
 61                 "start of reserved RAM used to store oops/panic logs");
 62 
 63 static ulong mem_size;
 64 module_param(mem_size, ulong, 0400);
 65 MODULE_PARM_DESC(mem_size,
 66                 "size of reserved RAM used to store oops/panic logs");
 67 
 68 static unsigned int mem_type;
 69 module_param(mem_type, uint, 0600);
 70 MODULE_PARM_DESC(mem_type,
 71                 "set to 1 to try to use unbuffered memory (default 0)");
 72 
 73 static int dump_oops = 1;
 74 module_param(dump_oops, int, 0600);
 75 MODULE_PARM_DESC(dump_oops,
 76                 "set to 1 to dump oopses, 0 to only dump panics (default 1)");
 77 
 78 static int ramoops_ecc;
 79 module_param_named(ecc, ramoops_ecc, int, 0600);
 80 MODULE_PARM_DESC(ramoops_ecc,
 81                 "if non-zero, the option enables ECC support and specifies "
 82                 "ECC buffer size in bytes (1 is a special value, means 16 "
 83                 "bytes ECC)");
 84 
 85 struct ramoops_context {
 86         struct persistent_ram_zone **przs;
 87         struct persistent_ram_zone *cprz;
 88         struct persistent_ram_zone *fprz;
 89         struct persistent_ram_zone *mprz;
 90         phys_addr_t phys_addr;
 91         unsigned long size;
 92         unsigned int memtype;
 93         size_t record_size;
 94         size_t console_size;
 95         size_t ftrace_size;
 96         size_t pmsg_size;
 97         int dump_oops;
 98         struct persistent_ram_ecc_info ecc_info;
 99         unsigned int max_dump_cnt;
100         unsigned int dump_write_cnt;
101         /* _read_cnt need clear on ramoops_pstore_open */
102         unsigned int dump_read_cnt;
103         unsigned int console_read_cnt;
104         unsigned int ftrace_read_cnt;
105         unsigned int pmsg_read_cnt;
106         struct pstore_info pstore;
107 };
108 
109 static struct platform_device *dummy;
110 static struct ramoops_platform_data *dummy_data;
111 
112 static int ramoops_pstore_open(struct pstore_info *psi)
113 {
114         struct ramoops_context *cxt = psi->data;
115 
116         cxt->dump_read_cnt = 0;
117         cxt->console_read_cnt = 0;
118         cxt->ftrace_read_cnt = 0;
119         cxt->pmsg_read_cnt = 0;
120         return 0;
121 }
122 
123 static struct persistent_ram_zone *
124 ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
125                      u64 *id,
126                      enum pstore_type_id *typep, enum pstore_type_id type,
127                      bool update)
128 {
129         struct persistent_ram_zone *prz;
130         int i = (*c)++;
131 
132         if (i >= max)
133                 return NULL;
134 
135         prz = przs[i];
136         if (!prz)
137                 return NULL;
138 
139         /* Update old/shadowed buffer. */
140         if (update)
141                 persistent_ram_save_old(prz);
142 
143         if (!persistent_ram_old_size(prz))
144                 return NULL;
145 
146         *typep = type;
147         *id = i;
148 
149         return prz;
150 }
151 
152 static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
153                                   bool *compressed)
154 {
155         char data_type;
156         int header_length = 0;
157 
158         if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
159                         &time->tv_nsec, &data_type, &header_length) == 3) {
160                 if (data_type == 'C')
161                         *compressed = true;
162                 else
163                         *compressed = false;
164         } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n%n",
165                         &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
166                         *compressed = false;
167         } else {
168                 time->tv_sec = 0;
169                 time->tv_nsec = 0;
170                 *compressed = false;
171         }
172         return header_length;
173 }
174 
175 static bool prz_ok(struct persistent_ram_zone *prz)
176 {
177         return !!prz && !!(persistent_ram_old_size(prz) +
178                            persistent_ram_ecc_string(prz, NULL, 0));
179 }
180 
181 static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
182                                    int *count, struct timespec *time,
183                                    char **buf, bool *compressed,
184                                    struct pstore_info *psi)
185 {
186         ssize_t size;
187         ssize_t ecc_notice_size;
188         struct ramoops_context *cxt = psi->data;
189         struct persistent_ram_zone *prz;
190         int header_length;
191 
192         prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
193                                    cxt->max_dump_cnt, id, type,
194                                    PSTORE_TYPE_DMESG, 1);
195         if (!prz_ok(prz))
196                 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
197                                            1, id, type, PSTORE_TYPE_CONSOLE, 0);
198         if (!prz_ok(prz))
199                 prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
200                                            1, id, type, PSTORE_TYPE_FTRACE, 0);
201         if (!prz_ok(prz))
202                 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
203                                            1, id, type, PSTORE_TYPE_PMSG, 0);
204         if (!prz_ok(prz))
205                 return 0;
206 
207         if (!persistent_ram_old(prz))
208                 return 0;
209 
210         size = persistent_ram_old_size(prz);
211         header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz), time,
212                         compressed);
213         size -= header_length;
214 
215         /* ECC correction notice */
216         ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
217 
218         *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
219         if (*buf == NULL)
220                 return -ENOMEM;
221 
222         memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
223         persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
224 
225         return size + ecc_notice_size;
226 }
227 
228 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
229                                      bool compressed)
230 {
231         char *hdr;
232         struct timespec timestamp;
233         size_t len;
234 
235         /* Report zeroed timestamp if called before timekeeping has resumed. */
236         if (__getnstimeofday(&timestamp)) {
237                 timestamp.tv_sec = 0;
238                 timestamp.tv_nsec = 0;
239         }
240         hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
241                 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
242                 compressed ? 'C' : 'D');
243         WARN_ON_ONCE(!hdr);
244         len = hdr ? strlen(hdr) : 0;
245         persistent_ram_write(prz, hdr, len);
246         kfree(hdr);
247 
248         return len;
249 }
250 
251 static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
252                                             enum kmsg_dump_reason reason,
253                                             u64 *id, unsigned int part,
254                                             const char *buf,
255                                             bool compressed, size_t size,
256                                             struct pstore_info *psi)
257 {
258         struct ramoops_context *cxt = psi->data;
259         struct persistent_ram_zone *prz;
260         size_t hlen;
261 
262         if (type == PSTORE_TYPE_CONSOLE) {
263                 if (!cxt->cprz)
264                         return -ENOMEM;
265                 persistent_ram_write(cxt->cprz, buf, size);
266                 return 0;
267         } else if (type == PSTORE_TYPE_FTRACE) {
268                 if (!cxt->fprz)
269                         return -ENOMEM;
270                 persistent_ram_write(cxt->fprz, buf, size);
271                 return 0;
272         } else if (type == PSTORE_TYPE_PMSG) {
273                 if (!cxt->mprz)
274                         return -ENOMEM;
275                 persistent_ram_write(cxt->mprz, buf, size);
276                 return 0;
277         }
278 
279         if (type != PSTORE_TYPE_DMESG)
280                 return -EINVAL;
281 
282         /* Out of the various dmesg dump types, ramoops is currently designed
283          * to only store crash logs, rather than storing general kernel logs.
284          */
285         if (reason != KMSG_DUMP_OOPS &&
286             reason != KMSG_DUMP_PANIC)
287                 return -EINVAL;
288 
289         /* Skip Oopes when configured to do so. */
290         if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
291                 return -EINVAL;
292 
293         /* Explicitly only take the first part of any new crash.
294          * If our buffer is larger than kmsg_bytes, this can never happen,
295          * and if our buffer is smaller than kmsg_bytes, we don't want the
296          * report split across multiple records.
297          */
298         if (part != 1)
299                 return -ENOSPC;
300 
301         if (!cxt->przs)
302                 return -ENOSPC;
303 
304         prz = cxt->przs[cxt->dump_write_cnt];
305 
306         hlen = ramoops_write_kmsg_hdr(prz, compressed);
307         if (size + hlen > prz->buffer_size)
308                 size = prz->buffer_size - hlen;
309         persistent_ram_write(prz, buf, size);
310 
311         cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
312 
313         return 0;
314 }
315 
316 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
317                                 struct timespec time, struct pstore_info *psi)
318 {
319         struct ramoops_context *cxt = psi->data;
320         struct persistent_ram_zone *prz;
321 
322         switch (type) {
323         case PSTORE_TYPE_DMESG:
324                 if (id >= cxt->max_dump_cnt)
325                         return -EINVAL;
326                 prz = cxt->przs[id];
327                 break;
328         case PSTORE_TYPE_CONSOLE:
329                 prz = cxt->cprz;
330                 break;
331         case PSTORE_TYPE_FTRACE:
332                 prz = cxt->fprz;
333                 break;
334         case PSTORE_TYPE_PMSG:
335                 prz = cxt->mprz;
336                 break;
337         default:
338                 return -EINVAL;
339         }
340 
341         persistent_ram_free_old(prz);
342         persistent_ram_zap(prz);
343 
344         return 0;
345 }
346 
347 static struct ramoops_context oops_cxt = {
348         .pstore = {
349                 .owner  = THIS_MODULE,
350                 .name   = "ramoops",
351                 .open   = ramoops_pstore_open,
352                 .read   = ramoops_pstore_read,
353                 .write_buf      = ramoops_pstore_write_buf,
354                 .erase  = ramoops_pstore_erase,
355         },
356 };
357 
358 static void ramoops_free_przs(struct ramoops_context *cxt)
359 {
360         int i;
361 
362         cxt->max_dump_cnt = 0;
363         if (!cxt->przs)
364                 return;
365 
366         for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++)
367                 persistent_ram_free(cxt->przs[i]);
368         kfree(cxt->przs);
369 }
370 
371 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
372                              phys_addr_t *paddr, size_t dump_mem_sz)
373 {
374         int err = -ENOMEM;
375         int i;
376 
377         if (!cxt->record_size)
378                 return 0;
379 
380         if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
381                 dev_err(dev, "no room for dumps\n");
382                 return -ENOMEM;
383         }
384 
385         cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
386         if (!cxt->max_dump_cnt)
387                 return -ENOMEM;
388 
389         cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
390                              GFP_KERNEL);
391         if (!cxt->przs) {
392                 dev_err(dev, "failed to initialize a prz array for dumps\n");
393                 goto fail_prz;
394         }
395 
396         for (i = 0; i < cxt->max_dump_cnt; i++) {
397                 size_t sz = cxt->record_size;
398 
399                 cxt->przs[i] = persistent_ram_new(*paddr, sz, 0,
400                                                   &cxt->ecc_info,
401                                                   cxt->memtype);
402                 if (IS_ERR(cxt->przs[i])) {
403                         err = PTR_ERR(cxt->przs[i]);
404                         dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
405                                 sz, (unsigned long long)*paddr, err);
406                         goto fail_prz;
407                 }
408                 *paddr += sz;
409         }
410 
411         return 0;
412 fail_prz:
413         ramoops_free_przs(cxt);
414         return err;
415 }
416 
417 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
418                             struct persistent_ram_zone **prz,
419                             phys_addr_t *paddr, size_t sz, u32 sig)
420 {
421         if (!sz)
422                 return 0;
423 
424         if (*paddr + sz - cxt->phys_addr > cxt->size) {
425                 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
426                         sz, (unsigned long long)*paddr,
427                         cxt->size, (unsigned long long)cxt->phys_addr);
428                 return -ENOMEM;
429         }
430 
431         *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype);
432         if (IS_ERR(*prz)) {
433                 int err = PTR_ERR(*prz);
434 
435                 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
436                         sz, (unsigned long long)*paddr, err);
437                 return err;
438         }
439 
440         persistent_ram_zap(*prz);
441 
442         *paddr += sz;
443 
444         return 0;
445 }
446 
447 static int ramoops_probe(struct platform_device *pdev)
448 {
449         struct device *dev = &pdev->dev;
450         struct ramoops_platform_data *pdata = pdev->dev.platform_data;
451         struct ramoops_context *cxt = &oops_cxt;
452         size_t dump_mem_sz;
453         phys_addr_t paddr;
454         int err = -EINVAL;
455 
456         /* Only a single ramoops area allowed at a time, so fail extra
457          * probes.
458          */
459         if (cxt->max_dump_cnt)
460                 goto fail_out;
461 
462         if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
463                         !pdata->ftrace_size && !pdata->pmsg_size)) {
464                 pr_err("The memory size and the record/console size must be "
465                         "non-zero\n");
466                 goto fail_out;
467         }
468 
469         if (pdata->record_size && !is_power_of_2(pdata->record_size))
470                 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
471         if (pdata->console_size && !is_power_of_2(pdata->console_size))
472                 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
473         if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
474                 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
475         if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
476                 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
477 
478         cxt->size = pdata->mem_size;
479         cxt->phys_addr = pdata->mem_address;
480         cxt->memtype = pdata->mem_type;
481         cxt->record_size = pdata->record_size;
482         cxt->console_size = pdata->console_size;
483         cxt->ftrace_size = pdata->ftrace_size;
484         cxt->pmsg_size = pdata->pmsg_size;
485         cxt->dump_oops = pdata->dump_oops;
486         cxt->ecc_info = pdata->ecc_info;
487 
488         paddr = cxt->phys_addr;
489 
490         dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
491                         - cxt->pmsg_size;
492         err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
493         if (err)
494                 goto fail_out;
495 
496         err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
497                                cxt->console_size, 0);
498         if (err)
499                 goto fail_init_cprz;
500 
501         err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
502                                LINUX_VERSION_CODE);
503         if (err)
504                 goto fail_init_fprz;
505 
506         err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
507         if (err)
508                 goto fail_init_mprz;
509 
510         cxt->pstore.data = cxt;
511         /*
512          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
513          * have to handle dumps, we must have at least record_size buffer. And
514          * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
515          * ZERO_SIZE_PTR).
516          */
517         if (cxt->console_size)
518                 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
519         cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
520         cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
521         spin_lock_init(&cxt->pstore.buf_lock);
522         if (!cxt->pstore.buf) {
523                 pr_err("cannot allocate pstore buffer\n");
524                 err = -ENOMEM;
525                 goto fail_clear;
526         }
527 
528         err = pstore_register(&cxt->pstore);
529         if (err) {
530                 pr_err("registering with pstore failed\n");
531                 goto fail_buf;
532         }
533 
534         /*
535          * Update the module parameter variables as well so they are visible
536          * through /sys/module/ramoops/parameters/
537          */
538         mem_size = pdata->mem_size;
539         mem_address = pdata->mem_address;
540         record_size = pdata->record_size;
541         dump_oops = pdata->dump_oops;
542         ramoops_console_size = pdata->console_size;
543         ramoops_pmsg_size = pdata->pmsg_size;
544         ramoops_ftrace_size = pdata->ftrace_size;
545 
546         pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
547                 cxt->size, (unsigned long long)cxt->phys_addr,
548                 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
549 
550         return 0;
551 
552 fail_buf:
553         kfree(cxt->pstore.buf);
554 fail_clear:
555         cxt->pstore.bufsize = 0;
556         kfree(cxt->mprz);
557 fail_init_mprz:
558         kfree(cxt->fprz);
559 fail_init_fprz:
560         kfree(cxt->cprz);
561 fail_init_cprz:
562         ramoops_free_przs(cxt);
563 fail_out:
564         return err;
565 }
566 
567 static int __exit ramoops_remove(struct platform_device *pdev)
568 {
569 #if 0
570         /* TODO(kees): We cannot unload ramoops since pstore doesn't support
571          * unregistering yet.
572          */
573         struct ramoops_context *cxt = &oops_cxt;
574 
575         iounmap(cxt->virt_addr);
576         release_mem_region(cxt->phys_addr, cxt->size);
577         cxt->max_dump_cnt = 0;
578 
579         /* TODO(kees): When pstore supports unregistering, call it here. */
580         kfree(cxt->pstore.buf);
581         cxt->pstore.bufsize = 0;
582 
583         return 0;
584 #endif
585         return -EBUSY;
586 }
587 
588 static struct platform_driver ramoops_driver = {
589         .probe          = ramoops_probe,
590         .remove         = __exit_p(ramoops_remove),
591         .driver         = {
592                 .name   = "ramoops",
593         },
594 };
595 
596 static void ramoops_register_dummy(void)
597 {
598         if (!mem_size)
599                 return;
600 
601         pr_info("using module parameters\n");
602 
603         dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
604         if (!dummy_data) {
605                 pr_info("could not allocate pdata\n");
606                 return;
607         }
608 
609         dummy_data->mem_size = mem_size;
610         dummy_data->mem_address = mem_address;
611         dummy_data->mem_type = 0;
612         dummy_data->record_size = record_size;
613         dummy_data->console_size = ramoops_console_size;
614         dummy_data->ftrace_size = ramoops_ftrace_size;
615         dummy_data->pmsg_size = ramoops_pmsg_size;
616         dummy_data->dump_oops = dump_oops;
617         /*
618          * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
619          * (using 1 byte for ECC isn't much of use anyway).
620          */
621         dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
622 
623         dummy = platform_device_register_data(NULL, "ramoops", -1,
624                         dummy_data, sizeof(struct ramoops_platform_data));
625         if (IS_ERR(dummy)) {
626                 pr_info("could not create platform device: %ld\n",
627                         PTR_ERR(dummy));
628         }
629 }
630 
631 static int __init ramoops_init(void)
632 {
633         ramoops_register_dummy();
634         return platform_driver_register(&ramoops_driver);
635 }
636 postcore_initcall(ramoops_init);
637 
638 static void __exit ramoops_exit(void)
639 {
640         platform_driver_unregister(&ramoops_driver);
641         platform_device_unregister(dummy);
642         kfree(dummy_data);
643 }
644 module_exit(ramoops_exit);
645 
646 MODULE_LICENSE("GPL");
647 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
648 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
649 

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