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