Version:  2.0.40 2.2.26 2.4.37 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 4.2 4.3 4.4 4.5 4.6

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 unsigned long long mem_address;
 59 module_param(mem_address, ullong, 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 = NULL;
190         int header_length = 0;
191 
192         /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
193          * PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
194          * valid time stamps, so it is initialized to zero.
195          */
196         time->tv_sec = 0;
197         time->tv_nsec = 0;
198         *compressed = false;
199 
200         /* Find the next valid persistent_ram_zone for DMESG */
201         while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
202                 prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
203                                            cxt->max_dump_cnt, id, type,
204                                            PSTORE_TYPE_DMESG, 1);
205                 if (!prz_ok(prz))
206                         continue;
207                 header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
208                                                       time, compressed);
209                 /* Clear and skip this DMESG record if it has no valid header */
210                 if (!header_length) {
211                         persistent_ram_free_old(prz);
212                         persistent_ram_zap(prz);
213                         prz = NULL;
214                 }
215         }
216 
217         if (!prz_ok(prz))
218                 prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
219                                            1, id, type, PSTORE_TYPE_CONSOLE, 0);
220         if (!prz_ok(prz))
221                 prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
222                                            1, id, type, PSTORE_TYPE_FTRACE, 0);
223         if (!prz_ok(prz))
224                 prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
225                                            1, id, type, PSTORE_TYPE_PMSG, 0);
226         if (!prz_ok(prz))
227                 return 0;
228 
229         size = persistent_ram_old_size(prz) - header_length;
230 
231         /* ECC correction notice */
232         ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
233 
234         *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
235         if (*buf == NULL)
236                 return -ENOMEM;
237 
238         memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
239         persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
240 
241         return size + ecc_notice_size;
242 }
243 
244 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
245                                      bool compressed)
246 {
247         char *hdr;
248         struct timespec timestamp;
249         size_t len;
250 
251         /* Report zeroed timestamp if called before timekeeping has resumed. */
252         if (__getnstimeofday(&timestamp)) {
253                 timestamp.tv_sec = 0;
254                 timestamp.tv_nsec = 0;
255         }
256         hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
257                 (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000),
258                 compressed ? 'C' : 'D');
259         WARN_ON_ONCE(!hdr);
260         len = hdr ? strlen(hdr) : 0;
261         persistent_ram_write(prz, hdr, len);
262         kfree(hdr);
263 
264         return len;
265 }
266 
267 static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
268                                             enum kmsg_dump_reason reason,
269                                             u64 *id, unsigned int part,
270                                             const char *buf,
271                                             bool compressed, size_t size,
272                                             struct pstore_info *psi)
273 {
274         struct ramoops_context *cxt = psi->data;
275         struct persistent_ram_zone *prz;
276         size_t hlen;
277 
278         if (type == PSTORE_TYPE_CONSOLE) {
279                 if (!cxt->cprz)
280                         return -ENOMEM;
281                 persistent_ram_write(cxt->cprz, buf, size);
282                 return 0;
283         } else if (type == PSTORE_TYPE_FTRACE) {
284                 if (!cxt->fprz)
285                         return -ENOMEM;
286                 persistent_ram_write(cxt->fprz, buf, size);
287                 return 0;
288         } else if (type == PSTORE_TYPE_PMSG) {
289                 if (!cxt->mprz)
290                         return -ENOMEM;
291                 persistent_ram_write(cxt->mprz, buf, size);
292                 return 0;
293         }
294 
295         if (type != PSTORE_TYPE_DMESG)
296                 return -EINVAL;
297 
298         /* Out of the various dmesg dump types, ramoops is currently designed
299          * to only store crash logs, rather than storing general kernel logs.
300          */
301         if (reason != KMSG_DUMP_OOPS &&
302             reason != KMSG_DUMP_PANIC)
303                 return -EINVAL;
304 
305         /* Skip Oopes when configured to do so. */
306         if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
307                 return -EINVAL;
308 
309         /* Explicitly only take the first part of any new crash.
310          * If our buffer is larger than kmsg_bytes, this can never happen,
311          * and if our buffer is smaller than kmsg_bytes, we don't want the
312          * report split across multiple records.
313          */
314         if (part != 1)
315                 return -ENOSPC;
316 
317         if (!cxt->przs)
318                 return -ENOSPC;
319 
320         prz = cxt->przs[cxt->dump_write_cnt];
321 
322         hlen = ramoops_write_kmsg_hdr(prz, compressed);
323         if (size + hlen > prz->buffer_size)
324                 size = prz->buffer_size - hlen;
325         persistent_ram_write(prz, buf, size);
326 
327         cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
328 
329         return 0;
330 }
331 
332 static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
333                                 struct timespec time, struct pstore_info *psi)
334 {
335         struct ramoops_context *cxt = psi->data;
336         struct persistent_ram_zone *prz;
337 
338         switch (type) {
339         case PSTORE_TYPE_DMESG:
340                 if (id >= cxt->max_dump_cnt)
341                         return -EINVAL;
342                 prz = cxt->przs[id];
343                 break;
344         case PSTORE_TYPE_CONSOLE:
345                 prz = cxt->cprz;
346                 break;
347         case PSTORE_TYPE_FTRACE:
348                 prz = cxt->fprz;
349                 break;
350         case PSTORE_TYPE_PMSG:
351                 prz = cxt->mprz;
352                 break;
353         default:
354                 return -EINVAL;
355         }
356 
357         persistent_ram_free_old(prz);
358         persistent_ram_zap(prz);
359 
360         return 0;
361 }
362 
363 static struct ramoops_context oops_cxt = {
364         .pstore = {
365                 .owner  = THIS_MODULE,
366                 .name   = "ramoops",
367                 .open   = ramoops_pstore_open,
368                 .read   = ramoops_pstore_read,
369                 .write_buf      = ramoops_pstore_write_buf,
370                 .erase  = ramoops_pstore_erase,
371         },
372 };
373 
374 static void ramoops_free_przs(struct ramoops_context *cxt)
375 {
376         int i;
377 
378         cxt->max_dump_cnt = 0;
379         if (!cxt->przs)
380                 return;
381 
382         for (i = 0; !IS_ERR_OR_NULL(cxt->przs[i]); i++)
383                 persistent_ram_free(cxt->przs[i]);
384         kfree(cxt->przs);
385 }
386 
387 static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
388                              phys_addr_t *paddr, size_t dump_mem_sz)
389 {
390         int err = -ENOMEM;
391         int i;
392 
393         if (!cxt->record_size)
394                 return 0;
395 
396         if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {
397                 dev_err(dev, "no room for dumps\n");
398                 return -ENOMEM;
399         }
400 
401         cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;
402         if (!cxt->max_dump_cnt)
403                 return -ENOMEM;
404 
405         cxt->przs = kzalloc(sizeof(*cxt->przs) * cxt->max_dump_cnt,
406                              GFP_KERNEL);
407         if (!cxt->przs) {
408                 dev_err(dev, "failed to initialize a prz array for dumps\n");
409                 goto fail_prz;
410         }
411 
412         for (i = 0; i < cxt->max_dump_cnt; i++) {
413                 cxt->przs[i] = persistent_ram_new(*paddr, cxt->record_size, 0,
414                                                   &cxt->ecc_info,
415                                                   cxt->memtype);
416                 if (IS_ERR(cxt->przs[i])) {
417                         err = PTR_ERR(cxt->przs[i]);
418                         dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
419                                 cxt->record_size, (unsigned long long)*paddr, err);
420                         goto fail_prz;
421                 }
422                 *paddr += cxt->record_size;
423         }
424 
425         return 0;
426 fail_prz:
427         ramoops_free_przs(cxt);
428         return err;
429 }
430 
431 static int ramoops_init_prz(struct device *dev, struct ramoops_context *cxt,
432                             struct persistent_ram_zone **prz,
433                             phys_addr_t *paddr, size_t sz, u32 sig)
434 {
435         if (!sz)
436                 return 0;
437 
438         if (*paddr + sz - cxt->phys_addr > cxt->size) {
439                 dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
440                         sz, (unsigned long long)*paddr,
441                         cxt->size, (unsigned long long)cxt->phys_addr);
442                 return -ENOMEM;
443         }
444 
445         *prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info, cxt->memtype);
446         if (IS_ERR(*prz)) {
447                 int err = PTR_ERR(*prz);
448 
449                 dev_err(dev, "failed to request mem region (0x%zx@0x%llx): %d\n",
450                         sz, (unsigned long long)*paddr, err);
451                 return err;
452         }
453 
454         persistent_ram_zap(*prz);
455 
456         *paddr += sz;
457 
458         return 0;
459 }
460 
461 static int ramoops_probe(struct platform_device *pdev)
462 {
463         struct device *dev = &pdev->dev;
464         struct ramoops_platform_data *pdata = pdev->dev.platform_data;
465         struct ramoops_context *cxt = &oops_cxt;
466         size_t dump_mem_sz;
467         phys_addr_t paddr;
468         int err = -EINVAL;
469 
470         /* Only a single ramoops area allowed at a time, so fail extra
471          * probes.
472          */
473         if (cxt->max_dump_cnt)
474                 goto fail_out;
475 
476         if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
477                         !pdata->ftrace_size && !pdata->pmsg_size)) {
478                 pr_err("The memory size and the record/console size must be "
479                         "non-zero\n");
480                 goto fail_out;
481         }
482 
483         if (pdata->record_size && !is_power_of_2(pdata->record_size))
484                 pdata->record_size = rounddown_pow_of_two(pdata->record_size);
485         if (pdata->console_size && !is_power_of_2(pdata->console_size))
486                 pdata->console_size = rounddown_pow_of_two(pdata->console_size);
487         if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
488                 pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
489         if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
490                 pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
491 
492         cxt->size = pdata->mem_size;
493         cxt->phys_addr = pdata->mem_address;
494         cxt->memtype = pdata->mem_type;
495         cxt->record_size = pdata->record_size;
496         cxt->console_size = pdata->console_size;
497         cxt->ftrace_size = pdata->ftrace_size;
498         cxt->pmsg_size = pdata->pmsg_size;
499         cxt->dump_oops = pdata->dump_oops;
500         cxt->ecc_info = pdata->ecc_info;
501 
502         paddr = cxt->phys_addr;
503 
504         dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
505                         - cxt->pmsg_size;
506         err = ramoops_init_przs(dev, cxt, &paddr, dump_mem_sz);
507         if (err)
508                 goto fail_out;
509 
510         err = ramoops_init_prz(dev, cxt, &cxt->cprz, &paddr,
511                                cxt->console_size, 0);
512         if (err)
513                 goto fail_init_cprz;
514 
515         err = ramoops_init_prz(dev, cxt, &cxt->fprz, &paddr, cxt->ftrace_size,
516                                LINUX_VERSION_CODE);
517         if (err)
518                 goto fail_init_fprz;
519 
520         err = ramoops_init_prz(dev, cxt, &cxt->mprz, &paddr, cxt->pmsg_size, 0);
521         if (err)
522                 goto fail_init_mprz;
523 
524         cxt->pstore.data = cxt;
525         /*
526          * Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
527          * have to handle dumps, we must have at least record_size buffer. And
528          * for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
529          * ZERO_SIZE_PTR).
530          */
531         if (cxt->console_size)
532                 cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
533         cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
534         cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
535         spin_lock_init(&cxt->pstore.buf_lock);
536         if (!cxt->pstore.buf) {
537                 pr_err("cannot allocate pstore buffer\n");
538                 err = -ENOMEM;
539                 goto fail_clear;
540         }
541 
542         err = pstore_register(&cxt->pstore);
543         if (err) {
544                 pr_err("registering with pstore failed\n");
545                 goto fail_buf;
546         }
547 
548         /*
549          * Update the module parameter variables as well so they are visible
550          * through /sys/module/ramoops/parameters/
551          */
552         mem_size = pdata->mem_size;
553         mem_address = pdata->mem_address;
554         record_size = pdata->record_size;
555         dump_oops = pdata->dump_oops;
556         ramoops_console_size = pdata->console_size;
557         ramoops_pmsg_size = pdata->pmsg_size;
558         ramoops_ftrace_size = pdata->ftrace_size;
559 
560         pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
561                 cxt->size, (unsigned long long)cxt->phys_addr,
562                 cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
563 
564         return 0;
565 
566 fail_buf:
567         kfree(cxt->pstore.buf);
568 fail_clear:
569         cxt->pstore.bufsize = 0;
570         kfree(cxt->mprz);
571 fail_init_mprz:
572         kfree(cxt->fprz);
573 fail_init_fprz:
574         kfree(cxt->cprz);
575 fail_init_cprz:
576         ramoops_free_przs(cxt);
577 fail_out:
578         return err;
579 }
580 
581 static int ramoops_remove(struct platform_device *pdev)
582 {
583         struct ramoops_context *cxt = &oops_cxt;
584 
585         pstore_unregister(&cxt->pstore);
586         cxt->max_dump_cnt = 0;
587 
588         kfree(cxt->pstore.buf);
589         cxt->pstore.bufsize = 0;
590 
591         persistent_ram_free(cxt->mprz);
592         persistent_ram_free(cxt->fprz);
593         persistent_ram_free(cxt->cprz);
594         ramoops_free_przs(cxt);
595 
596         return 0;
597 }
598 
599 static struct platform_driver ramoops_driver = {
600         .probe          = ramoops_probe,
601         .remove         = ramoops_remove,
602         .driver         = {
603                 .name   = "ramoops",
604         },
605 };
606 
607 static void ramoops_register_dummy(void)
608 {
609         if (!mem_size)
610                 return;
611 
612         pr_info("using module parameters\n");
613 
614         dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
615         if (!dummy_data) {
616                 pr_info("could not allocate pdata\n");
617                 return;
618         }
619 
620         dummy_data->mem_size = mem_size;
621         dummy_data->mem_address = mem_address;
622         dummy_data->mem_type = mem_type;
623         dummy_data->record_size = record_size;
624         dummy_data->console_size = ramoops_console_size;
625         dummy_data->ftrace_size = ramoops_ftrace_size;
626         dummy_data->pmsg_size = ramoops_pmsg_size;
627         dummy_data->dump_oops = dump_oops;
628         /*
629          * For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
630          * (using 1 byte for ECC isn't much of use anyway).
631          */
632         dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
633 
634         dummy = platform_device_register_data(NULL, "ramoops", -1,
635                         dummy_data, sizeof(struct ramoops_platform_data));
636         if (IS_ERR(dummy)) {
637                 pr_info("could not create platform device: %ld\n",
638                         PTR_ERR(dummy));
639         }
640 }
641 
642 static int __init ramoops_init(void)
643 {
644         ramoops_register_dummy();
645         return platform_driver_register(&ramoops_driver);
646 }
647 postcore_initcall(ramoops_init);
648 
649 static void __exit ramoops_exit(void)
650 {
651         platform_driver_unregister(&ramoops_driver);
652         platform_device_unregister(dummy);
653         kfree(dummy_data);
654 }
655 module_exit(ramoops_exit);
656 
657 MODULE_LICENSE("GPL");
658 MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
659 MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
660 

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