fs/proc/proc_misc.c

   1 /*
   2  *  linux/fs/proc/proc_misc.c
   3  *
   4  *  linux/fs/proc/array.c
   5  *  Copyright (C) 1992  by Linus Torvalds
   6  *  based on ideas by Darren Senn
   7  *
   8  *  This used to be the part of array.c. See the rest of history and credits
   9  *  there. I took this into a separate file and switched the thing to generic
  10  *  proc_file_inode_operations, leaving in array.c only per-process stuff.
  11  *  Inumbers allocation made dynamic (via create_proc_entry()).  AV, May 1999.
  12  *
  13  * Changes:
  14  * Fulton Green      :  Encapsulated position metric calculations.
  15  *                      <kernel@FultonGreen.com>
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/errno.h>
  20 #include <linux/time.h>
  21 #include <linux/kernel.h>
  22 #include <linux/kernel_stat.h>
  23 #include <linux/tty.h>
  24 #include <linux/string.h>
  25 #include <linux/mman.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/ioport.h>
  28 #include <linux/config.h>
  29 #include <linux/mm.h>
  30 #include <linux/mmzone.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/swap.h>
  33 #include <linux/slab.h>
  34 #include <linux/smp.h>
  35 #include <linux/signal.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/smp_lock.h>
  39 #include <linux/seq_file.h>
  40 #include <linux/times.h>
  41 #include <linux/profile.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/hugetlb.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/sysrq.h>
  46 #include <linux/vmalloc.h>
  47 #include <linux/crash_dump.h>
  48
  49 #include <asm/uaccess.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/io.h>
  52 #include <asm/tlb.h>
  53 #include <asm/div64.h>
  54 #include "internal.h"
  55
  56 #include <linux/vs_cvirt.h>
  57
  58 #define LOAD_INT(x) ((x) >> FSHIFT)
  59 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  60 /*
  61  * Warning: stuff below (imported functions) assumes that its output will fit
  62  * into one page. For some of those functions it may be wrong. Moreover, we
  63  * have a way to deal with that gracefully. Right now I used straightforward
  64  * wrappers, but this needs further analysis wrt potential overflows.
  65  */
  66 extern int get_hardware_list(char *);
  67 extern int get_stram_list(char *);
  68 extern int get_chrdev_list(char *);
  69 extern int get_filesystem_list(char *);
  70 extern int get_exec_domain_list(char *);
  71 extern int get_dma_list(char *);
  72 extern int get_locks_status (char *, char **, off_t, int);
  73
  74 static int proc_calc_metrics(char *page, char **start, off_t off,
  75                                  int count, int *eof, int len)
  76 {
  77         if (len <= off+count) *eof = 1;
  78         *start = page + off;
  79         len -= off;
  80         if (len>count) len = count;
  81         if (len<0) len = 0;
  82         return len;
  83 }
  84
  85 static int loadavg_read_proc(char *page, char **start, off_t off,
  86                                  int count, int *eof, void *data)
  87 {
  88         unsigned int running, threads;
  89         int a, b, c;
  90         int len;
  91
  92         if (vx_flags(VXF_VIRT_LOAD, 0)) {
  93                 struct vx_info *vxi = current->vx_info;
  94
  95                 a = vxi->cvirt.load[0] + (FIXED_1/200);
  96                 b = vxi->cvirt.load[1] + (FIXED_1/200);
  97                 c = vxi->cvirt.load[2] + (FIXED_1/200);
  98
  99                 running = atomic_read(&vxi->cvirt.nr_running);
 100                 threads = atomic_read(&vxi->cvirt.nr_threads);
 101         } else {
 102                 a = avenrun[0] + (FIXED_1/200);
 103                 b = avenrun[1] + (FIXED_1/200);
 104                 c = avenrun[2] + (FIXED_1/200);
 105
 106                 running = nr_running();
 107                 threads = nr_threads;
 108         }
 109         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %d/%d %d\n",
 110                 LOAD_INT(a), LOAD_FRAC(a),
 111                 LOAD_INT(b), LOAD_FRAC(b),
 112                 LOAD_INT(c), LOAD_FRAC(c),
 113                 running, threads, last_pid);
 114         return proc_calc_metrics(page, start, off, count, eof, len);
 115 }
 116
 117 static int uptime_read_proc(char *page, char **start, off_t off,
 118                                  int count, int *eof, void *data)
 119 {
 120         struct timespec uptime;
 121         struct timespec idle;
 122         int len;
 123         cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
 124
 125         do_posix_clock_monotonic_gettime(&uptime);
 126         cputime_to_timespec(idletime, &idle);
 127         if (vx_flags(VXF_VIRT_UPTIME, 0))
 128                 vx_vsi_uptime(&uptime, &idle);
 129
 130         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 131                         (unsigned long) uptime.tv_sec,
 132                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 133                         (unsigned long) idle.tv_sec,
 134                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 135
 136         return proc_calc_metrics(page, start, off, count, eof, len);
 137 }
 138
 139 static int meminfo_read_proc(char *page, char **start, off_t off,
 140                                  int count, int *eof, void *data)
 141 {
 142         struct sysinfo i;
 143         int len;
 144         struct page_state ps;
 145         unsigned long inactive;
 146         unsigned long active;
 147         unsigned long free;
 148         unsigned long committed;
 149         unsigned long allowed;
 150         struct vmalloc_info vmi;
 151         long cached;
 152
 153         get_page_state(&ps);
 154         get_zone_counts(&active, &inactive, &free);
 155
 156 /*
 157  * display in kilobytes.
 158  */
 159 #define K(x) ((x) << (PAGE_SHIFT - 10))
 160         si_meminfo(&i);
 161         si_swapinfo(&i);
 162         committed = atomic_read(&vm_committed_space);
 163         allowed = ((totalram_pages - hugetlb_total_pages())
 164                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 165
 166         cached = get_page_cache_size() - total_swapcache_pages - i.bufferram;
 167         if (cached < 0)
 168                 cached = 0;
 169
 170         get_vmalloc_info(&vmi);
 171
 172         /*
 173          * Tagged format, for easy grepping and expansion.
 174          */
 175         len = sprintf(page,
 176                 "MemTotal:     %8lu kB\n"
 177                 "MemFree:      %8lu kB\n"
 178                 "Buffers:      %8lu kB\n"
 179                 "Cached:       %8lu kB\n"
 180                 "SwapCached:   %8lu kB\n"
 181                 "Active:       %8lu kB\n"
 182                 "Inactive:     %8lu kB\n"
 183                 "HighTotal:    %8lu kB\n"
 184                 "HighFree:     %8lu kB\n"
 185                 "LowTotal:     %8lu kB\n"
 186                 "LowFree:      %8lu kB\n"
 187                 "SwapTotal:    %8lu kB\n"
 188                 "SwapFree:     %8lu kB\n"
 189                 "Dirty:        %8lu kB\n"
 190                 "Writeback:    %8lu kB\n"
 191                 "Mapped:       %8lu kB\n"
 192                 "Slab:         %8lu kB\n"
 193                 "CommitLimit:  %8lu kB\n"
 194                 "Committed_AS: %8lu kB\n"
 195                 "PageTables:   %8lu kB\n"
 196                 "VmallocTotal: %8lu kB\n"
 197                 "VmallocUsed:  %8lu kB\n"
 198                 "VmallocChunk: %8lu kB\n",
 199                 K(i.totalram),
 200                 K(i.freeram),
 201                 K(i.bufferram),
 202                 K(cached),
 203                 K(total_swapcache_pages),
 204                 K(active),
 205                 K(inactive),
 206                 K(i.totalhigh),
 207                 K(i.freehigh),
 208                 K(i.totalram-i.totalhigh),
 209                 K(i.freeram-i.freehigh),
 210                 K(i.totalswap),
 211                 K(i.freeswap),
 212                 K(ps.nr_dirty),
 213                 K(ps.nr_writeback),
 214                 K(ps.nr_mapped),
 215                 K(ps.nr_slab),
 216                 K(allowed),
 217                 K(committed),
 218                 K(ps.nr_page_table_pages),
 219                 (unsigned long)VMALLOC_TOTAL >> 10,
 220                 vmi.used >> 10,
 221                 vmi.largest_chunk >> 10
 222                 );
 223
 224                 len += hugetlb_report_meminfo(page + len);
 225
 226         return proc_calc_metrics(page, start, off, count, eof, len);
 227 #undef K
 228 }
 229
 230 extern struct seq_operations fragmentation_op;
 231 static int fragmentation_open(struct inode *inode, struct file *file)
 232 {
 233         (void)inode;
 234         return seq_open(file, &fragmentation_op);
 235 }
 236
 237 static struct file_operations fragmentation_file_operations = {
 238         .open           = fragmentation_open,
 239         .read           = seq_read,
 240         .llseek         = seq_lseek,
 241         .release        = seq_release,
 242 };
 243
 244 static int version_read_proc(char *page, char **start, off_t off,
 245                                  int count, int *eof, void *data)
 246 {
 247         int len;
 248
 249         len = sprintf(page, vx_linux_banner,
 250                 vx_new_uts(release),
 251                 vx_new_uts(version));
 252         return proc_calc_metrics(page, start, off, count, eof, len);
 253 }
 254
 255 extern struct seq_operations cpuinfo_op;
 256 static int cpuinfo_open(struct inode *inode, struct file *file)
 257 {
 258         return seq_open(file, &cpuinfo_op);
 259 }
 260 static struct file_operations proc_cpuinfo_operations = {
 261         .open           = cpuinfo_open,
 262         .read           = seq_read,
 263         .llseek         = seq_lseek,
 264         .release        = seq_release,
 265 };
 266
 267 extern struct seq_operations vmstat_op;
 268 static int vmstat_open(struct inode *inode, struct file *file)
 269 {
 270         return seq_open(file, &vmstat_op);
 271 }
 272 static struct file_operations proc_vmstat_file_operations = {
 273         .open           = vmstat_open,
 274         .read           = seq_read,
 275         .llseek         = seq_lseek,
 276         .release        = seq_release,
 277 };
 278
 279 #ifdef CONFIG_PROC_HARDWARE
 280 static int hardware_read_proc(char *page, char **start, off_t off,
 281                                  int count, int *eof, void *data)
 282 {
 283         int len = get_hardware_list(page);
 284         return proc_calc_metrics(page, start, off, count, eof, len);
 285 }
 286 #endif
 287
 288 #ifdef CONFIG_STRAM_PROC
 289 static int stram_read_proc(char *page, char **start, off_t off,
 290                                  int count, int *eof, void *data)
 291 {
 292         int len = get_stram_list(page);
 293         return proc_calc_metrics(page, start, off, count, eof, len);
 294 }
 295 #endif
 296
 297 extern struct seq_operations partitions_op;
 298 static int partitions_open(struct inode *inode, struct file *file)
 299 {
 300         return seq_open(file, &partitions_op);
 301 }
 302 static struct file_operations proc_partitions_operations = {
 303         .open           = partitions_open,
 304         .read           = seq_read,
 305         .llseek         = seq_lseek,
 306         .release        = seq_release,
 307 };
 308
 309 extern struct seq_operations diskstats_op;
 310 static int diskstats_open(struct inode *inode, struct file *file)
 311 {
 312         return seq_open(file, &diskstats_op);
 313 }
 314 static struct file_operations proc_diskstats_operations = {
 315         .open           = diskstats_open,
 316         .read           = seq_read,
 317         .llseek         = seq_lseek,
 318         .release        = seq_release,
 319 };
 320
 321 #ifdef CONFIG_MODULES
 322 extern struct seq_operations modules_op;
 323 static int modules_open(struct inode *inode, struct file *file)
 324 {
 325         return seq_open(file, &modules_op);
 326 }
 327 static struct file_operations proc_modules_operations = {
 328         .open           = modules_open,
 329         .read           = seq_read,
 330         .llseek         = seq_lseek,
 331         .release        = seq_release,
 332 };
 333 #endif
 334
 335 extern struct seq_operations slabinfo_op;
 336 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 337 static int slabinfo_open(struct inode *inode, struct file *file)
 338 {
 339         return seq_open(file, &slabinfo_op);
 340 }
 341 static struct file_operations proc_slabinfo_operations = {
 342         .open           = slabinfo_open,
 343         .read           = seq_read,
 344         .write          = slabinfo_write,
 345         .llseek         = seq_lseek,
 346         .release        = seq_release,
 347 };
 348
 349 static int show_stat(struct seq_file *p, void *v)
 350 {
 351         int i;
 352         unsigned long jif;
 353         cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
 354         u64 sum = 0;
 355
 356         user = nice = system = idle = iowait =
 357                 irq = softirq = steal = cputime64_zero;
 358         jif = - wall_to_monotonic.tv_sec;
 359         if (wall_to_monotonic.tv_nsec)
 360                 --jif;
 361
 362         for_each_cpu(i) {
 363                 int j;
 364
 365                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
 366                 nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
 367                 system = cputime64_add(system, kstat_cpu(i).cpustat.system);
 368                 idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
 369                 iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
 370                 irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
 371                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
 372                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
 373                 for (j = 0 ; j < NR_IRQS ; j++)
 374                         sum += kstat_cpu(i).irqs[j];
 375         }
 376
 377         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
 378                 (unsigned long long)cputime64_to_clock_t(user),
 379                 (unsigned long long)cputime64_to_clock_t(nice),
 380                 (unsigned long long)cputime64_to_clock_t(system),
 381                 (unsigned long long)cputime64_to_clock_t(idle),
 382                 (unsigned long long)cputime64_to_clock_t(iowait),
 383                 (unsigned long long)cputime64_to_clock_t(irq),
 384                 (unsigned long long)cputime64_to_clock_t(softirq),
 385                 (unsigned long long)cputime64_to_clock_t(steal));
 386         for_each_online_cpu(i) {
 387
 388                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 389                 user = kstat_cpu(i).cpustat.user;
 390                 nice = kstat_cpu(i).cpustat.nice;
 391                 system = kstat_cpu(i).cpustat.system;
 392                 idle = kstat_cpu(i).cpustat.idle;
 393                 iowait = kstat_cpu(i).cpustat.iowait;
 394                 irq = kstat_cpu(i).cpustat.irq;
 395                 softirq = kstat_cpu(i).cpustat.softirq;
 396                 steal = kstat_cpu(i).cpustat.steal;
 397                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
 398                         i,
 399                         (unsigned long long)cputime64_to_clock_t(user),
 400                         (unsigned long long)cputime64_to_clock_t(nice),
 401                         (unsigned long long)cputime64_to_clock_t(system),
 402                         (unsigned long long)cputime64_to_clock_t(idle),
 403                         (unsigned long long)cputime64_to_clock_t(iowait),
 404                         (unsigned long long)cputime64_to_clock_t(irq),
 405                         (unsigned long long)cputime64_to_clock_t(softirq),
 406                         (unsigned long long)cputime64_to_clock_t(steal));
 407         }
 408         seq_printf(p, "intr %llu", (unsigned long long)sum);
 409
 410 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
 411         for (i = 0; i < NR_IRQS; i++)
 412                 seq_printf(p, " %u", kstat_irqs(i));
 413 #endif
 414
 415         seq_printf(p,
 416                 "\nctxt %llu\n"
 417                 "btime %lu\n"
 418                 "processes %lu\n"
 419                 "procs_running %lu\n"
 420                 "procs_blocked %lu\n",
 421                 nr_context_switches(),
 422                 (unsigned long)jif,
 423                 total_forks,
 424                 nr_running(),
 425                 nr_iowait());
 426
 427         return 0;
 428 }
 429
 430 static int stat_open(struct inode *inode, struct file *file)
 431 {
 432         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 433         char *buf;
 434         struct seq_file *m;
 435         int res;
 436
 437         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 438         if (size > 128 * 1024)
 439                 size = 128 * 1024;
 440         buf = kmalloc(size, GFP_KERNEL);
 441         if (!buf)
 442                 return -ENOMEM;
 443
 444         res = single_open(file, show_stat, NULL);
 445         if (!res) {
 446                 m = file->private_data;
 447                 m->buf = buf;
 448                 m->size = size;
 449         } else
 450                 kfree(buf);
 451         return res;
 452 }
 453 static struct file_operations proc_stat_operations = {
 454         .open           = stat_open,
 455         .read           = seq_read,
 456         .llseek         = seq_lseek,
 457         .release        = single_release,
 458 };
 459
 460 static int devices_read_proc(char *page, char **start, off_t off,
 461                                  int count, int *eof, void *data)
 462 {
 463         int len = get_chrdev_list(page);
 464         len += get_blkdev_list(page+len);
 465         return proc_calc_metrics(page, start, off, count, eof, len);
 466 }
 467
 468 /*
 469  * /proc/interrupts
 470  */
 471 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 472 {
 473         return (*pos <= NR_IRQS) ? pos : NULL;
 474 }
 475
 476 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 477 {
 478         (*pos)++;
 479         if (*pos > NR_IRQS)
 480                 return NULL;
 481         return pos;
 482 }
 483
 484 static void int_seq_stop(struct seq_file *f, void *v)
 485 {
 486         /* Nothing to do */
 487 }
 488
 489
 490 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 491 static struct seq_operations int_seq_ops = {
 492         .start = int_seq_start,
 493         .next  = int_seq_next,
 494         .stop  = int_seq_stop,
 495         .show  = show_interrupts
 496 };
 497
 498 static int interrupts_open(struct inode *inode, struct file *filp)
 499 {
 500         return seq_open(filp, &int_seq_ops);
 501 }
 502
 503 static struct file_operations proc_interrupts_operations = {
 504         .open           = interrupts_open,
 505         .read           = seq_read,
 506         .llseek         = seq_lseek,
 507         .release        = seq_release,
 508 };
 509
 510 static int filesystems_read_proc(char *page, char **start, off_t off,
 511                                  int count, int *eof, void *data)
 512 {
 513         int len = get_filesystem_list(page);
 514         return proc_calc_metrics(page, start, off, count, eof, len);
 515 }
 516
 517 static int cmdline_read_proc(char *page, char **start, off_t off,
 518                                  int count, int *eof, void *data)
 519 {
 520         int len;
 521
 522         len = sprintf(page, "%s\n", saved_command_line);
 523         return proc_calc_metrics(page, start, off, count, eof, len);
 524 }
 525
 526 static int locks_read_proc(char *page, char **start, off_t off,
 527                                  int count, int *eof, void *data)
 528 {
 529         int len = get_locks_status(page, start, off, count);
 530
 531         if (len < count)
 532                 *eof = 1;
 533         return len;
 534 }
 535
 536 static int execdomains_read_proc(char *page, char **start, off_t off,
 537                                  int count, int *eof, void *data)
 538 {
 539         int len = get_exec_domain_list(page);
 540         return proc_calc_metrics(page, start, off, count, eof, len);
 541 }
 542
 543 #ifdef CONFIG_MAGIC_SYSRQ
 544 /*
 545  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 546  */
 547 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 548                                    size_t count, loff_t *ppos)
 549 {
 550         if (count) {
 551                 char c;
 552
 553                 if (get_user(c, buf))
 554                         return -EFAULT;
 555                 __handle_sysrq(c, NULL, NULL, 0);
 556         }
 557         return count;
 558 }
 559
 560 static struct file_operations proc_sysrq_trigger_operations = {
 561         .write          = write_sysrq_trigger,
 562 };
 563 #endif
 564
 565 struct proc_dir_entry *proc_root_kcore;
 566
 567 void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
 568 {
 569         struct proc_dir_entry *entry;
 570         entry = create_proc_entry(name, mode, NULL);
 571         if (entry)
 572                 entry->proc_fops = f;
 573 }
 574
 575 void __init proc_misc_init(void)
 576 {
 577         struct proc_dir_entry *entry;
 578         static struct {
 579                 char *name;
 580                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 581         } *p, simple_ones[] = {
 582                 {"loadavg",     loadavg_read_proc},
 583                 {"uptime",      uptime_read_proc},
 584                 {"meminfo",     meminfo_read_proc},
 585                 {"version",     version_read_proc},
 586 #ifdef CONFIG_PROC_HARDWARE
 587                 {"hardware",    hardware_read_proc},
 588 #endif
 589 #ifdef CONFIG_STRAM_PROC
 590                 {"stram",       stram_read_proc},
 591 #endif
 592                 {"devices",     devices_read_proc},
 593                 {"filesystems", filesystems_read_proc},
 594                 {"cmdline",     cmdline_read_proc},
 595                 {"locks",       locks_read_proc},
 596                 {"execdomains", execdomains_read_proc},
 597                 {NULL,}
 598         };
 599         for (p = simple_ones; p->name; p++)
 600                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 601
 602         proc_symlink("mounts", NULL, "self/mounts");
 603
 604         /* And now for trickier ones */
 605         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 606         if (entry)
 607                 entry->proc_fops = &proc_kmsg_operations;
 608         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 609         create_seq_entry("partitions", 0, &proc_partitions_operations);
 610         create_seq_entry("stat", 0, &proc_stat_operations);
 611         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 612         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 613         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 614         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 615         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 616 #ifdef CONFIG_MODULES
 617         create_seq_entry("modules", 0, &proc_modules_operations);
 618 #endif
 619 #ifdef CONFIG_SCHEDSTATS
 620         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 621 #endif
 622 #ifdef CONFIG_PROC_KCORE
 623         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 624         if (proc_root_kcore) {
 625                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 626                 proc_root_kcore->size =
 627                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 628         }
 629 #endif
 630         crash_create_proc_entry();
 631 #ifdef CONFIG_MAGIC_SYSRQ
 632         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 633         if (entry)
 634                 entry->proc_fops = &proc_sysrq_trigger_operations;
 635 #endif
 636         crash_enable_by_proc();
 637 #ifdef CONFIG_PPC32
 638         {
 639                 extern struct file_operations ppc_htab_operations;
 640                 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
 641                 if (entry)
 642                         entry->proc_fops = &ppc_htab_operations;
 643         }
 644 #endif
 645 }