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