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 <asm/uaccess.h>
  48 #include <asm/pgtable.h>
  49 #include <asm/io.h>
  50 #include <asm/tlb.h>
  51 #include <asm/div64.h>
  52
  53 #define LOAD_INT(x) ((x) >> FSHIFT)
  54 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  55 /*
  56  * Warning: stuff below (imported functions) assumes that its output will fit
  57  * into one page. For some of those functions it may be wrong. Moreover, we
  58  * have a way to deal with that gracefully. Right now I used straightforward
  59  * wrappers, but this needs further analysis wrt potential overflows.
  60  */
  61 extern int get_hardware_list(char *);
  62 extern int get_stram_list(char *);
  63 extern int get_chrdev_list(char *);
  64 extern int get_blkdev_list(char *);
  65 extern int get_filesystem_list(char *);
  66 extern int get_exec_domain_list(char *);
  67 extern int get_dma_list(char *);
  68 extern int get_locks_status (char *, char **, off_t, int);
  69
  70 static int proc_calc_metrics(char *page, char **start, off_t off,
  71                                  int count, int *eof, int len)
  72 {
  73         if (len <= off+count) *eof = 1;
  74         *start = page + off;
  75         len -= off;
  76         if (len>count) len = count;
  77         if (len<0) len = 0;
  78         return len;
  79 }
  80
  81 static int loadavg_read_proc(char *page, char **start, off_t off,
  82                                  int count, int *eof, void *data)
  83 {
  84         int a, b, c;
  85         int len;
  86
  87         a = avenrun[0] + (FIXED_1/200);
  88         b = avenrun[1] + (FIXED_1/200);
  89         c = avenrun[2] + (FIXED_1/200);
  90         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
  91                 LOAD_INT(a), LOAD_FRAC(a),
  92                 LOAD_INT(b), LOAD_FRAC(b),
  93                 LOAD_INT(c), LOAD_FRAC(c),
  94                 nr_running(), nr_threads, last_pid);
  95         return proc_calc_metrics(page, start, off, count, eof, len);
  96 }
  97
  98 struct vmalloc_info {
  99         unsigned long used;
 100         unsigned long largest_chunk;
 101 };
 102
 103 static struct vmalloc_info get_vmalloc_info(void)
 104 {
 105         unsigned long prev_end = VMALLOC_START;
 106         struct vm_struct* vma;
 107         struct vmalloc_info vmi;
 108         vmi.used = 0;
 109
 110         read_lock(&vmlist_lock);
 111
 112         if(!vmlist)
 113                 vmi.largest_chunk = (VMALLOC_END-VMALLOC_START);
 114         else
 115                 vmi.largest_chunk = 0;
 116
 117         for (vma = vmlist; vma; vma = vma->next) {
 118                 unsigned long free_area_size =
 119                         (unsigned long)vma->addr - prev_end;
 120                 vmi.used += vma->size;
 121                 if (vmi.largest_chunk < free_area_size )
 122
 123                         vmi.largest_chunk = free_area_size;
 124                 prev_end = vma->size + (unsigned long)vma->addr;
 125         }
 126         if(VMALLOC_END-prev_end > vmi.largest_chunk)
 127                 vmi.largest_chunk = VMALLOC_END-prev_end;
 128
 129         read_unlock(&vmlist_lock);
 130         return vmi;
 131 }
 132
 133 static int uptime_read_proc(char *page, char **start, off_t off,
 134                                  int count, int *eof, void *data)
 135 {
 136         struct timespec uptime;
 137         struct timespec idle;
 138         int len;
 139         u64 idle_jiffies = init_task.utime + init_task.stime;
 140
 141         do_posix_clock_monotonic_gettime(&uptime);
 142         jiffies_to_timespec(idle_jiffies, &idle);
 143         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 144                         (unsigned long) uptime.tv_sec,
 145                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 146                         (unsigned long) idle.tv_sec,
 147                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 148
 149         return proc_calc_metrics(page, start, off, count, eof, len);
 150 }
 151
 152 static int meminfo_read_proc(char *page, char **start, off_t off,
 153                                  int count, int *eof, void *data)
 154 {
 155         struct sysinfo i;
 156         int len;
 157         struct page_state ps;
 158         unsigned long inactive;
 159         unsigned long active;
 160         unsigned long free;
 161         unsigned long vmtot;
 162         unsigned long committed;
 163         unsigned long allowed;
 164         struct vmalloc_info vmi;
 165
 166         get_page_state(&ps);
 167         get_zone_counts(&active, &inactive, &free);
 168
 169 /*
 170  * display in kilobytes.
 171  */
 172 #define K(x) ((x) << (PAGE_SHIFT - 10))
 173         si_meminfo(&i);
 174         si_swapinfo(&i);
 175         committed = atomic_read(&vm_committed_space);
 176         allowed = ((totalram_pages - hugetlb_total_pages())
 177                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 178
 179         vmtot = (VMALLOC_END-VMALLOC_START)>>10;
 180         vmi = get_vmalloc_info();
 181         vmi.used >>= 10;
 182         vmi.largest_chunk >>= 10;
 183
 184         /*
 185          * Tagged format, for easy grepping and expansion.
 186          */
 187         len = sprintf(page,
 188                 "MemTotal:     %8lu kB\n"
 189                 "MemFree:      %8lu kB\n"
 190                 "Buffers:      %8lu kB\n"
 191                 "Cached:       %8lu kB\n"
 192                 "SwapCached:   %8lu kB\n"
 193                 "Active:       %8lu kB\n"
 194                 "Inactive:     %8lu kB\n"
 195                 "HighTotal:    %8lu kB\n"
 196                 "HighFree:     %8lu kB\n"
 197                 "LowTotal:     %8lu kB\n"
 198                 "LowFree:      %8lu kB\n"
 199                 "SwapTotal:    %8lu kB\n"
 200                 "SwapFree:     %8lu kB\n"
 201                 "Dirty:        %8lu kB\n"
 202                 "Writeback:    %8lu kB\n"
 203                 "Mapped:       %8lu kB\n"
 204                 "Slab:         %8lu kB\n"
 205                 "CommitLimit:  %8lu kB\n"
 206                 "Committed_AS: %8lu kB\n"
 207                 "PageTables:   %8lu kB\n"
 208                 "VmallocTotal: %8lu kB\n"
 209                 "VmallocUsed:  %8lu kB\n"
 210                 "VmallocChunk: %8lu kB\n",
 211                 K(i.totalram),
 212                 K(i.freeram),
 213                 K(i.bufferram),
 214                 K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
 215                 K(total_swapcache_pages),
 216                 K(active),
 217                 K(inactive),
 218                 K(i.totalhigh),
 219                 K(i.freehigh),
 220                 K(i.totalram-i.totalhigh),
 221                 K(i.freeram-i.freehigh),
 222                 K(i.totalswap),
 223                 K(i.freeswap),
 224                 K(ps.nr_dirty),
 225                 K(ps.nr_writeback),
 226                 K(ps.nr_mapped),
 227                 K(ps.nr_slab),
 228                 K(allowed),
 229                 K(committed),
 230                 K(ps.nr_page_table_pages),
 231                 vmtot,
 232                 vmi.used,
 233                 vmi.largest_chunk
 234                 );
 235
 236                 len += hugetlb_report_meminfo(page + len);
 237
 238         return proc_calc_metrics(page, start, off, count, eof, len);
 239 #undef K
 240 }
 241
 242 extern struct seq_operations fragmentation_op;
 243 static int fragmentation_open(struct inode *inode, struct file *file)
 244 {
 245         (void)inode;
 246         return seq_open(file, &fragmentation_op);
 247 }
 248
 249 static struct file_operations fragmentation_file_operations = {
 250         .open           = fragmentation_open,
 251         .read           = seq_read,
 252         .llseek         = seq_lseek,
 253         .release        = seq_release,
 254 };
 255
 256 static int version_read_proc(char *page, char **start, off_t off,
 257                                  int count, int *eof, void *data)
 258 {
 259         extern char *linux_banner;
 260         int len;
 261
 262         strcpy(page, linux_banner);
 263         len = strlen(page);
 264         return proc_calc_metrics(page, start, off, count, eof, len);
 265 }
 266
 267 extern struct seq_operations cpuinfo_op;
 268 static int cpuinfo_open(struct inode *inode, struct file *file)
 269 {
 270         return seq_open(file, &cpuinfo_op);
 271 }
 272 static struct file_operations proc_cpuinfo_operations = {
 273         .open           = cpuinfo_open,
 274         .read           = seq_read,
 275         .llseek         = seq_lseek,
 276         .release        = seq_release,
 277 };
 278
 279 extern struct seq_operations vmstat_op;
 280 static int vmstat_open(struct inode *inode, struct file *file)
 281 {
 282         return seq_open(file, &vmstat_op);
 283 }
 284 static struct file_operations proc_vmstat_file_operations = {
 285         .open           = vmstat_open,
 286         .read           = seq_read,
 287         .llseek         = seq_lseek,
 288         .release        = seq_release,
 289 };
 290
 291 #ifdef CONFIG_PROC_HARDWARE
 292 static int hardware_read_proc(char *page, char **start, off_t off,
 293                                  int count, int *eof, void *data)
 294 {
 295         int len = get_hardware_list(page);
 296         return proc_calc_metrics(page, start, off, count, eof, len);
 297 }
 298 #endif
 299
 300 #ifdef CONFIG_STRAM_PROC
 301 static int stram_read_proc(char *page, char **start, off_t off,
 302                                  int count, int *eof, void *data)
 303 {
 304         int len = get_stram_list(page);
 305         return proc_calc_metrics(page, start, off, count, eof, len);
 306 }
 307 #endif
 308
 309 extern struct seq_operations partitions_op;
 310 static int partitions_open(struct inode *inode, struct file *file)
 311 {
 312         return seq_open(file, &partitions_op);
 313 }
 314 static struct file_operations proc_partitions_operations = {
 315         .open           = partitions_open,
 316         .read           = seq_read,
 317         .llseek         = seq_lseek,
 318         .release        = seq_release,
 319 };
 320
 321 extern struct seq_operations diskstats_op;
 322 static int diskstats_open(struct inode *inode, struct file *file)
 323 {
 324         return seq_open(file, &diskstats_op);
 325 }
 326 static struct file_operations proc_diskstats_operations = {
 327         .open           = diskstats_open,
 328         .read           = seq_read,
 329         .llseek         = seq_lseek,
 330         .release        = seq_release,
 331 };
 332
 333 #ifdef CONFIG_MODULES
 334 extern struct seq_operations modules_op;
 335 static int modules_open(struct inode *inode, struct file *file)
 336 {
 337         return seq_open(file, &modules_op);
 338 }
 339 static struct file_operations proc_modules_operations = {
 340         .open           = modules_open,
 341         .read           = seq_read,
 342         .llseek         = seq_lseek,
 343         .release        = seq_release,
 344 };
 345 #endif
 346
 347 extern struct seq_operations slabinfo_op;
 348 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 349 static int slabinfo_open(struct inode *inode, struct file *file)
 350 {
 351         return seq_open(file, &slabinfo_op);
 352 }
 353 static struct file_operations proc_slabinfo_operations = {
 354         .open           = slabinfo_open,
 355         .read           = seq_read,
 356         .write          = slabinfo_write,
 357         .llseek         = seq_lseek,
 358         .release        = seq_release,
 359 };
 360
 361 int show_stat(struct seq_file *p, void *v)
 362 {
 363         int i;
 364         extern unsigned long total_forks;
 365         unsigned long jif;
 366         u64     sum = 0, user = 0, nice = 0, system = 0,
 367                 idle = 0, iowait = 0, irq = 0, softirq = 0;
 368
 369         jif = - wall_to_monotonic.tv_sec;
 370         if (wall_to_monotonic.tv_nsec)
 371                 --jif;
 372
 373         for_each_cpu(i) {
 374                 int j;
 375
 376                 user += kstat_cpu(i).cpustat.user;
 377                 nice += kstat_cpu(i).cpustat.nice;
 378                 system += kstat_cpu(i).cpustat.system;
 379                 idle += kstat_cpu(i).cpustat.idle;
 380                 iowait += kstat_cpu(i).cpustat.iowait;
 381                 irq += kstat_cpu(i).cpustat.irq;
 382                 softirq += kstat_cpu(i).cpustat.softirq;
 383                 for (j = 0 ; j < NR_IRQS ; j++)
 384                         sum += kstat_cpu(i).irqs[j];
 385         }
 386
 387         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu\n",
 388                 (unsigned long long)jiffies_64_to_clock_t(user),
 389                 (unsigned long long)jiffies_64_to_clock_t(nice),
 390                 (unsigned long long)jiffies_64_to_clock_t(system),
 391                 (unsigned long long)jiffies_64_to_clock_t(idle),
 392                 (unsigned long long)jiffies_64_to_clock_t(iowait),
 393                 (unsigned long long)jiffies_64_to_clock_t(irq),
 394                 (unsigned long long)jiffies_64_to_clock_t(softirq));
 395         for_each_online_cpu(i) {
 396
 397                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 398                 user = kstat_cpu(i).cpustat.user;
 399                 nice = kstat_cpu(i).cpustat.nice;
 400                 system = kstat_cpu(i).cpustat.system;
 401                 idle = kstat_cpu(i).cpustat.idle;
 402                 iowait = kstat_cpu(i).cpustat.iowait;
 403                 irq = kstat_cpu(i).cpustat.irq;
 404                 softirq = kstat_cpu(i).cpustat.softirq;
 405                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu\n",
 406                         i,
 407                         (unsigned long long)jiffies_64_to_clock_t(user),
 408                         (unsigned long long)jiffies_64_to_clock_t(nice),
 409                         (unsigned long long)jiffies_64_to_clock_t(system),
 410                         (unsigned long long)jiffies_64_to_clock_t(idle),
 411                         (unsigned long long)jiffies_64_to_clock_t(iowait),
 412                         (unsigned long long)jiffies_64_to_clock_t(irq),
 413                         (unsigned long long)jiffies_64_to_clock_t(softirq));
 414         }
 415         seq_printf(p, "intr %llu", (unsigned long long)sum);
 416
 417 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
 418         for (i = 0; i < NR_IRQS; i++)
 419                 seq_printf(p, " %u", kstat_irqs(i));
 420 #endif
 421
 422         seq_printf(p,
 423                 "\nctxt %llu\n"
 424                 "btime %lu\n"
 425                 "processes %lu\n"
 426                 "procs_running %lu\n"
 427                 "procs_blocked %lu\n",
 428                 nr_context_switches(),
 429                 (unsigned long)jif,
 430                 total_forks,
 431                 nr_running(),
 432                 nr_iowait());
 433
 434         return 0;
 435 }
 436
 437 static int stat_open(struct inode *inode, struct file *file)
 438 {
 439         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 440         char *buf;
 441         struct seq_file *m;
 442         int res;
 443
 444         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 445         if (size > 128 * 1024)
 446                 size = 128 * 1024;
 447         buf = kmalloc(size, GFP_KERNEL);
 448         if (!buf)
 449                 return -ENOMEM;
 450
 451         res = single_open(file, show_stat, NULL);
 452         if (!res) {
 453                 m = file->private_data;
 454                 m->buf = buf;
 455                 m->size = size;
 456         } else
 457                 kfree(buf);
 458         return res;
 459 }
 460 static struct file_operations proc_stat_operations = {
 461         .open           = stat_open,
 462         .read           = seq_read,
 463         .llseek         = seq_lseek,
 464         .release        = single_release,
 465 };
 466
 467 static int devices_read_proc(char *page, char **start, off_t off,
 468                                  int count, int *eof, void *data)
 469 {
 470         int len = get_chrdev_list(page);
 471         len += get_blkdev_list(page+len);
 472         return proc_calc_metrics(page, start, off, count, eof, len);
 473 }
 474
 475 /*
 476  * /proc/interrupts
 477  */
 478 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 479 {
 480         return (*pos <= NR_IRQS) ? pos : NULL;
 481 }
 482
 483 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 484 {
 485         (*pos)++;
 486         if (*pos > NR_IRQS)
 487                 return NULL;
 488         return pos;
 489 }
 490
 491 static void int_seq_stop(struct seq_file *f, void *v)
 492 {
 493         /* Nothing to do */
 494 }
 495
 496
 497 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 498 static struct seq_operations int_seq_ops = {
 499         .start = int_seq_start,
 500         .next  = int_seq_next,
 501         .stop  = int_seq_stop,
 502         .show  = show_interrupts
 503 };
 504
 505 int interrupts_open(struct inode *inode, struct file *filp)
 506 {
 507         return seq_open(filp, &int_seq_ops);
 508 }
 509
 510 static struct file_operations proc_interrupts_operations = {
 511         .open           = interrupts_open,
 512         .read           = seq_read,
 513         .llseek         = seq_lseek,
 514         .release        = seq_release,
 515 };
 516
 517 static int filesystems_read_proc(char *page, char **start, off_t off,
 518                                  int count, int *eof, void *data)
 519 {
 520         int len = get_filesystem_list(page);
 521         return proc_calc_metrics(page, start, off, count, eof, len);
 522 }
 523
 524 static int cmdline_read_proc(char *page, char **start, off_t off,
 525                                  int count, int *eof, void *data)
 526 {
 527         int len;
 528
 529         len = sprintf(page, "%s\n", saved_command_line);
 530         return proc_calc_metrics(page, start, off, count, eof, len);
 531 }
 532
 533 static int locks_read_proc(char *page, char **start, off_t off,
 534                                  int count, int *eof, void *data)
 535 {
 536         int len = get_locks_status(page, start, off, count);
 537
 538         if (len < count)
 539                 *eof = 1;
 540         return len;
 541 }
 542
 543 static int execdomains_read_proc(char *page, char **start, off_t off,
 544                                  int count, int *eof, void *data)
 545 {
 546         int len = get_exec_domain_list(page);
 547         return proc_calc_metrics(page, start, off, count, eof, len);
 548 }
 549
 550 #ifdef CONFIG_MAGIC_SYSRQ
 551 /*
 552  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 553  */
 554 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 555                                    size_t count, loff_t *ppos)
 556 {
 557         if (count) {
 558                 char c;
 559
 560                 if (get_user(c, buf))
 561                         return -EFAULT;
 562                 __handle_sysrq(c, NULL, NULL);
 563         }
 564         return count;
 565 }
 566
 567 static struct file_operations proc_sysrq_trigger_operations = {
 568         .write          = write_sysrq_trigger,
 569 };
 570 #endif
 571
 572 struct proc_dir_entry *proc_root_kcore;
 573
 574 static void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
 575 {
 576         struct proc_dir_entry *entry;
 577         entry = create_proc_entry(name, mode, NULL);
 578         if (entry)
 579                 entry->proc_fops = f;
 580 }
 581
 582 void __init proc_misc_init(void)
 583 {
 584         struct proc_dir_entry *entry;
 585         static struct {
 586                 char *name;
 587                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 588         } *p, simple_ones[] = {
 589                 {"loadavg",     loadavg_read_proc},
 590                 {"uptime",      uptime_read_proc},
 591                 {"meminfo",     meminfo_read_proc},
 592                 {"version",     version_read_proc},
 593 #ifdef CONFIG_PROC_HARDWARE
 594                 {"hardware",    hardware_read_proc},
 595 #endif
 596 #ifdef CONFIG_STRAM_PROC
 597                 {"stram",       stram_read_proc},
 598 #endif
 599                 {"devices",     devices_read_proc},
 600                 {"filesystems", filesystems_read_proc},
 601                 {"cmdline",     cmdline_read_proc},
 602                 {"locks",       locks_read_proc},
 603                 {"execdomains", execdomains_read_proc},
 604                 {NULL,}
 605         };
 606         for (p = simple_ones; p->name; p++)
 607                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 608
 609         proc_symlink("mounts", NULL, "self/mounts");
 610
 611         /* And now for trickier ones */
 612         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 613         if (entry)
 614                 entry->proc_fops = &proc_kmsg_operations;
 615         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 616         create_seq_entry("partitions", 0, &proc_partitions_operations);
 617         create_seq_entry("stat", 0, &proc_stat_operations);
 618         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 619         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 620         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 621         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 622         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 623 #ifdef CONFIG_MODULES
 624         create_seq_entry("modules", 0, &proc_modules_operations);
 625 #endif
 626 #ifdef CONFIG_SCHEDSTATS
 627         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 628 #endif
 629 #ifdef CONFIG_PROC_KCORE
 630         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 631         if (proc_root_kcore) {
 632                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 633                 proc_root_kcore->size =
 634                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 635         }
 636 #endif
 637 #ifdef CONFIG_MAGIC_SYSRQ
 638         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 639         if (entry)
 640                 entry->proc_fops = &proc_sysrq_trigger_operations;
 641 #endif
 642 #ifdef CONFIG_PPC32
 643         {
 644                 extern struct file_operations ppc_htab_operations;
 645                 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
 646                 if (entry)
 647                         entry->proc_fops = &ppc_htab_operations;
 648         }
 649 #endif
 650 }