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/vs_base.h>
  48 #include <linux/vs_cvirt.h>
  49
  50 #include <asm/uaccess.h>
  51 #include <asm/pgtable.h>
  52 #include <asm/io.h>
  53 #include <asm/tlb.h>
  54 #include <asm/div64.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_blkdev_list(char *);
  68 extern int get_filesystem_list(char *);
  69 extern int get_exec_domain_list(char *);
  70 extern int get_dma_list(char *);
  71 extern int get_locks_status (char *, char **, off_t, int);
  72
  73 static int proc_calc_metrics(char *page, char **start, off_t off,
  74                                  int count, int *eof, int len)
  75 {
  76         if (len <= off+count) *eof = 1;
  77         *start = page + off;
  78         len -= off;
  79         if (len>count) len = count;
  80         if (len<0) len = 0;
  81         return len;
  82 }
  83
  84 static int loadavg_read_proc(char *page, char **start, off_t off,
  85                                  int count, int *eof, void *data)
  86 {
  87         unsigned int running, threads;
  88         int a, b, c;
  89         int len;
  90
  91         if (vx_flags(VXF_VIRT_LOAD, 0)) {
  92                 struct vx_info *vxi = current->vx_info;
  93
  94                 a = vxi->cvirt.load[0] + (FIXED_1/200);
  95                 b = vxi->cvirt.load[1] + (FIXED_1/200);
  96                 c = vxi->cvirt.load[2] + (FIXED_1/200);
  97
  98                 running = atomic_read(&vxi->cvirt.nr_running);
  99                 threads = atomic_read(&vxi->cvirt.nr_threads);
 100         } else {
 101                 a = avenrun[0] + (FIXED_1/200);
 102                 b = avenrun[1] + (FIXED_1/200);
 103                 c = avenrun[2] + (FIXED_1/200);
 104
 105                 running = nr_running();
 106                 threads = nr_threads;
 107         }
 108         len = sprintf(page,"%d.%02d %d.%02d %d.%02d %d/%d %d\n",
 109                 LOAD_INT(a), LOAD_FRAC(a),
 110                 LOAD_INT(b), LOAD_FRAC(b),
 111                 LOAD_INT(c), LOAD_FRAC(c),
 112                 running, threads, last_pid);
 113         return proc_calc_metrics(page, start, off, count, eof, len);
 114 }
 115
 116 struct vmalloc_info {
 117         unsigned long used;
 118         unsigned long largest_chunk;
 119 };
 120
 121 static struct vmalloc_info get_vmalloc_info(void)
 122 {
 123         unsigned long prev_end = VMALLOC_START;
 124         struct vm_struct* vma;
 125         struct vmalloc_info vmi;
 126         vmi.used = 0;
 127
 128         read_lock(&vmlist_lock);
 129
 130         if(!vmlist)
 131                 vmi.largest_chunk = (VMALLOC_END-VMALLOC_START);
 132         else
 133                 vmi.largest_chunk = 0;
 134
 135         for (vma = vmlist; vma; vma = vma->next) {
 136                 unsigned long free_area_size =
 137                         (unsigned long)vma->addr - prev_end;
 138                 vmi.used += vma->size;
 139                 if (vmi.largest_chunk < free_area_size )
 140
 141                         vmi.largest_chunk = free_area_size;
 142                 prev_end = vma->size + (unsigned long)vma->addr;
 143         }
 144         if(VMALLOC_END-prev_end > vmi.largest_chunk)
 145                 vmi.largest_chunk = VMALLOC_END-prev_end;
 146
 147         read_unlock(&vmlist_lock);
 148         return vmi;
 149 }
 150
 151 static int uptime_read_proc(char *page, char **start, off_t off,
 152                                  int count, int *eof, void *data)
 153 {
 154         struct timespec uptime;
 155         struct timespec idle;
 156         int len;
 157         u64 idle_jiffies = init_task.utime + init_task.stime;
 158
 159         do_posix_clock_monotonic_gettime(&uptime);
 160         jiffies_to_timespec(idle_jiffies, &idle);
 161         if (vx_flags(VXF_VIRT_UPTIME, 0))
 162                 vx_vsi_uptime(&uptime, &idle);
 163
 164         len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
 165                         (unsigned long) uptime.tv_sec,
 166                         (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 167                         (unsigned long) idle.tv_sec,
 168                         (idle.tv_nsec / (NSEC_PER_SEC / 100)));
 169
 170         return proc_calc_metrics(page, start, off, count, eof, len);
 171 }
 172
 173 static int meminfo_read_proc(char *page, char **start, off_t off,
 174                                  int count, int *eof, void *data)
 175 {
 176         struct sysinfo i;
 177         int len;
 178         struct page_state ps;
 179         unsigned long inactive;
 180         unsigned long active;
 181         unsigned long free;
 182         unsigned long vmtot;
 183         unsigned long committed;
 184         unsigned long allowed;
 185         struct vmalloc_info vmi;
 186
 187         get_page_state(&ps);
 188         get_zone_counts(&active, &inactive, &free);
 189
 190 /*
 191  * display in kilobytes.
 192  */
 193 #define K(x) ((x) << (PAGE_SHIFT - 10))
 194         si_meminfo(&i);
 195         si_swapinfo(&i);
 196         committed = atomic_read(&vm_committed_space);
 197         allowed = ((totalram_pages - hugetlb_total_pages())
 198                 * sysctl_overcommit_ratio / 100) + total_swap_pages;
 199
 200         vmtot = (VMALLOC_END-VMALLOC_START)>>10;
 201         vmi = get_vmalloc_info();
 202         vmi.used >>= 10;
 203         vmi.largest_chunk >>= 10;
 204
 205         /*
 206          * Tagged format, for easy grepping and expansion.
 207          */
 208         len = sprintf(page,
 209                 "MemTotal:     %8lu kB\n"
 210                 "MemFree:      %8lu kB\n"
 211                 "Buffers:      %8lu kB\n"
 212                 "Cached:       %8lu kB\n"
 213                 "SwapCached:   %8lu kB\n"
 214                 "Active:       %8lu kB\n"
 215                 "Inactive:     %8lu kB\n"
 216                 "HighTotal:    %8lu kB\n"
 217                 "HighFree:     %8lu kB\n"
 218                 "LowTotal:     %8lu kB\n"
 219                 "LowFree:      %8lu kB\n"
 220                 "SwapTotal:    %8lu kB\n"
 221                 "SwapFree:     %8lu kB\n"
 222                 "Dirty:        %8lu kB\n"
 223                 "Writeback:    %8lu kB\n"
 224                 "Mapped:       %8lu kB\n"
 225                 "Slab:         %8lu kB\n"
 226                 "CommitLimit:  %8lu kB\n"
 227                 "Committed_AS: %8lu kB\n"
 228                 "PageTables:   %8lu kB\n"
 229                 "VmallocTotal: %8lu kB\n"
 230                 "VmallocUsed:  %8lu kB\n"
 231                 "VmallocChunk: %8lu kB\n",
 232                 K(i.totalram),
 233                 K(i.freeram),
 234                 K(i.bufferram),
 235                 K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
 236                 K(total_swapcache_pages),
 237                 K(active),
 238                 K(inactive),
 239                 K(i.totalhigh),
 240                 K(i.freehigh),
 241                 K(i.totalram-i.totalhigh),
 242                 K(i.freeram-i.freehigh),
 243                 K(i.totalswap),
 244                 K(i.freeswap),
 245                 K(ps.nr_dirty),
 246                 K(ps.nr_writeback),
 247                 K(ps.nr_mapped),
 248                 K(ps.nr_slab),
 249                 K(allowed),
 250                 K(committed),
 251                 K(ps.nr_page_table_pages),
 252                 vmtot,
 253                 vmi.used,
 254                 vmi.largest_chunk
 255                 );
 256
 257                 len += hugetlb_report_meminfo(page + len);
 258
 259         return proc_calc_metrics(page, start, off, count, eof, len);
 260 #undef K
 261 }
 262
 263 extern struct seq_operations fragmentation_op;
 264 static int fragmentation_open(struct inode *inode, struct file *file)
 265 {
 266         (void)inode;
 267         return seq_open(file, &fragmentation_op);
 268 }
 269
 270 static struct file_operations fragmentation_file_operations = {
 271         .open           = fragmentation_open,
 272         .read           = seq_read,
 273         .llseek         = seq_lseek,
 274         .release        = seq_release,
 275 };
 276
 277 static int version_read_proc(char *page, char **start, off_t off,
 278                                  int count, int *eof, void *data)
 279 {
 280         extern char *linux_banner;
 281         int len;
 282
 283         strcpy(page, linux_banner);
 284         len = strlen(page);
 285         return proc_calc_metrics(page, start, off, count, eof, len);
 286 }
 287
 288 extern struct seq_operations cpuinfo_op;
 289 static int cpuinfo_open(struct inode *inode, struct file *file)
 290 {
 291         return seq_open(file, &cpuinfo_op);
 292 }
 293 static struct file_operations proc_cpuinfo_operations = {
 294         .open           = cpuinfo_open,
 295         .read           = seq_read,
 296         .llseek         = seq_lseek,
 297         .release        = seq_release,
 298 };
 299
 300 extern struct seq_operations vmstat_op;
 301 static int vmstat_open(struct inode *inode, struct file *file)
 302 {
 303         return seq_open(file, &vmstat_op);
 304 }
 305 static struct file_operations proc_vmstat_file_operations = {
 306         .open           = vmstat_open,
 307         .read           = seq_read,
 308         .llseek         = seq_lseek,
 309         .release        = seq_release,
 310 };
 311
 312 #ifdef CONFIG_PROC_HARDWARE
 313 static int hardware_read_proc(char *page, char **start, off_t off,
 314                                  int count, int *eof, void *data)
 315 {
 316         int len = get_hardware_list(page);
 317         return proc_calc_metrics(page, start, off, count, eof, len);
 318 }
 319 #endif
 320
 321 #ifdef CONFIG_STRAM_PROC
 322 static int stram_read_proc(char *page, char **start, off_t off,
 323                                  int count, int *eof, void *data)
 324 {
 325         int len = get_stram_list(page);
 326         return proc_calc_metrics(page, start, off, count, eof, len);
 327 }
 328 #endif
 329
 330 extern struct seq_operations partitions_op;
 331 static int partitions_open(struct inode *inode, struct file *file)
 332 {
 333         return seq_open(file, &partitions_op);
 334 }
 335 static struct file_operations proc_partitions_operations = {
 336         .open           = partitions_open,
 337         .read           = seq_read,
 338         .llseek         = seq_lseek,
 339         .release        = seq_release,
 340 };
 341
 342 extern struct seq_operations diskstats_op;
 343 static int diskstats_open(struct inode *inode, struct file *file)
 344 {
 345         return seq_open(file, &diskstats_op);
 346 }
 347 static struct file_operations proc_diskstats_operations = {
 348         .open           = diskstats_open,
 349         .read           = seq_read,
 350         .llseek         = seq_lseek,
 351         .release        = seq_release,
 352 };
 353
 354 #ifdef CONFIG_MODULES
 355 extern struct seq_operations modules_op;
 356 static int modules_open(struct inode *inode, struct file *file)
 357 {
 358         return seq_open(file, &modules_op);
 359 }
 360 static struct file_operations proc_modules_operations = {
 361         .open           = modules_open,
 362         .read           = seq_read,
 363         .llseek         = seq_lseek,
 364         .release        = seq_release,
 365 };
 366 #endif
 367
 368 extern struct seq_operations slabinfo_op;
 369 extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
 370 static int slabinfo_open(struct inode *inode, struct file *file)
 371 {
 372         return seq_open(file, &slabinfo_op);
 373 }
 374 static struct file_operations proc_slabinfo_operations = {
 375         .open           = slabinfo_open,
 376         .read           = seq_read,
 377         .write          = slabinfo_write,
 378         .llseek         = seq_lseek,
 379         .release        = seq_release,
 380 };
 381
 382 int show_stat(struct seq_file *p, void *v)
 383 {
 384         int i;
 385         extern unsigned long total_forks;
 386         unsigned long jif;
 387         u64     sum = 0, user = 0, nice = 0, system = 0,
 388                 idle = 0, iowait = 0, irq = 0, softirq = 0;
 389
 390         jif = - wall_to_monotonic.tv_sec;
 391         if (wall_to_monotonic.tv_nsec)
 392                 --jif;
 393
 394         for_each_cpu(i) {
 395                 int j;
 396
 397                 user += kstat_cpu(i).cpustat.user;
 398                 nice += kstat_cpu(i).cpustat.nice;
 399                 system += kstat_cpu(i).cpustat.system;
 400                 idle += kstat_cpu(i).cpustat.idle;
 401                 iowait += kstat_cpu(i).cpustat.iowait;
 402                 irq += kstat_cpu(i).cpustat.irq;
 403                 softirq += kstat_cpu(i).cpustat.softirq;
 404                 for (j = 0 ; j < NR_IRQS ; j++)
 405                         sum += kstat_cpu(i).irqs[j];
 406         }
 407
 408         seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu\n",
 409                 (unsigned long long)jiffies_64_to_clock_t(user),
 410                 (unsigned long long)jiffies_64_to_clock_t(nice),
 411                 (unsigned long long)jiffies_64_to_clock_t(system),
 412                 (unsigned long long)jiffies_64_to_clock_t(idle),
 413                 (unsigned long long)jiffies_64_to_clock_t(iowait),
 414                 (unsigned long long)jiffies_64_to_clock_t(irq),
 415                 (unsigned long long)jiffies_64_to_clock_t(softirq));
 416         for_each_online_cpu(i) {
 417
 418                 /* Copy values here to work around gcc-2.95.3, gcc-2.96 */
 419                 user = kstat_cpu(i).cpustat.user;
 420                 nice = kstat_cpu(i).cpustat.nice;
 421                 system = kstat_cpu(i).cpustat.system;
 422                 idle = kstat_cpu(i).cpustat.idle;
 423                 iowait = kstat_cpu(i).cpustat.iowait;
 424                 irq = kstat_cpu(i).cpustat.irq;
 425                 softirq = kstat_cpu(i).cpustat.softirq;
 426                 seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu\n",
 427                         i,
 428                         (unsigned long long)jiffies_64_to_clock_t(user),
 429                         (unsigned long long)jiffies_64_to_clock_t(nice),
 430                         (unsigned long long)jiffies_64_to_clock_t(system),
 431                         (unsigned long long)jiffies_64_to_clock_t(idle),
 432                         (unsigned long long)jiffies_64_to_clock_t(iowait),
 433                         (unsigned long long)jiffies_64_to_clock_t(irq),
 434                         (unsigned long long)jiffies_64_to_clock_t(softirq));
 435         }
 436         seq_printf(p, "intr %llu", (unsigned long long)sum);
 437
 438 #if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
 439         for (i = 0; i < NR_IRQS; i++)
 440                 seq_printf(p, " %u", kstat_irqs(i));
 441 #endif
 442
 443         seq_printf(p,
 444                 "\nctxt %llu\n"
 445                 "btime %lu\n"
 446                 "processes %lu\n"
 447                 "procs_running %lu\n"
 448                 "procs_blocked %lu\n",
 449                 nr_context_switches(),
 450                 (unsigned long)jif,
 451                 total_forks,
 452                 nr_running(),
 453                 nr_iowait());
 454
 455         return 0;
 456 }
 457
 458 static int stat_open(struct inode *inode, struct file *file)
 459 {
 460         unsigned size = 4096 * (1 + num_possible_cpus() / 32);
 461         char *buf;
 462         struct seq_file *m;
 463         int res;
 464
 465         /* don't ask for more than the kmalloc() max size, currently 128 KB */
 466         if (size > 128 * 1024)
 467                 size = 128 * 1024;
 468         buf = kmalloc(size, GFP_KERNEL);
 469         if (!buf)
 470                 return -ENOMEM;
 471
 472         res = single_open(file, show_stat, NULL);
 473         if (!res) {
 474                 m = file->private_data;
 475                 m->buf = buf;
 476                 m->size = size;
 477         } else
 478                 kfree(buf);
 479         return res;
 480 }
 481 static struct file_operations proc_stat_operations = {
 482         .open           = stat_open,
 483         .read           = seq_read,
 484         .llseek         = seq_lseek,
 485         .release        = single_release,
 486 };
 487
 488 static int devices_read_proc(char *page, char **start, off_t off,
 489                                  int count, int *eof, void *data)
 490 {
 491         int len = get_chrdev_list(page);
 492         len += get_blkdev_list(page+len);
 493         return proc_calc_metrics(page, start, off, count, eof, len);
 494 }
 495
 496 /*
 497  * /proc/interrupts
 498  */
 499 static void *int_seq_start(struct seq_file *f, loff_t *pos)
 500 {
 501         return (*pos <= NR_IRQS) ? pos : NULL;
 502 }
 503
 504 static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
 505 {
 506         (*pos)++;
 507         if (*pos > NR_IRQS)
 508                 return NULL;
 509         return pos;
 510 }
 511
 512 static void int_seq_stop(struct seq_file *f, void *v)
 513 {
 514         /* Nothing to do */
 515 }
 516
 517
 518 extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
 519 static struct seq_operations int_seq_ops = {
 520         .start = int_seq_start,
 521         .next  = int_seq_next,
 522         .stop  = int_seq_stop,
 523         .show  = show_interrupts
 524 };
 525
 526 int interrupts_open(struct inode *inode, struct file *filp)
 527 {
 528         return seq_open(filp, &int_seq_ops);
 529 }
 530
 531 static struct file_operations proc_interrupts_operations = {
 532         .open           = interrupts_open,
 533         .read           = seq_read,
 534         .llseek         = seq_lseek,
 535         .release        = seq_release,
 536 };
 537
 538 static int filesystems_read_proc(char *page, char **start, off_t off,
 539                                  int count, int *eof, void *data)
 540 {
 541         int len = get_filesystem_list(page);
 542         return proc_calc_metrics(page, start, off, count, eof, len);
 543 }
 544
 545 static int cmdline_read_proc(char *page, char **start, off_t off,
 546                                  int count, int *eof, void *data)
 547 {
 548         int len;
 549
 550         len = sprintf(page, "%s\n", saved_command_line);
 551         return proc_calc_metrics(page, start, off, count, eof, len);
 552 }
 553
 554 static int locks_read_proc(char *page, char **start, off_t off,
 555                                  int count, int *eof, void *data)
 556 {
 557         int len = get_locks_status(page, start, off, count);
 558
 559         if (len < count)
 560                 *eof = 1;
 561         return len;
 562 }
 563
 564 static int execdomains_read_proc(char *page, char **start, off_t off,
 565                                  int count, int *eof, void *data)
 566 {
 567         int len = get_exec_domain_list(page);
 568         return proc_calc_metrics(page, start, off, count, eof, len);
 569 }
 570
 571 #ifdef CONFIG_MAGIC_SYSRQ
 572 /*
 573  * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 574  */
 575 static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
 576                                    size_t count, loff_t *ppos)
 577 {
 578         if (count) {
 579                 char c;
 580
 581                 if (get_user(c, buf))
 582                         return -EFAULT;
 583                 __handle_sysrq(c, NULL, NULL);
 584         }
 585         return count;
 586 }
 587
 588 static struct file_operations proc_sysrq_trigger_operations = {
 589         .write          = write_sysrq_trigger,
 590 };
 591 #endif
 592
 593 struct proc_dir_entry *proc_root_kcore;
 594
 595 static void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
 596 {
 597         struct proc_dir_entry *entry;
 598         entry = create_proc_entry(name, mode, NULL);
 599         if (entry)
 600                 entry->proc_fops = f;
 601 }
 602
 603 void __init proc_misc_init(void)
 604 {
 605         struct proc_dir_entry *entry;
 606         static struct {
 607                 char *name;
 608                 int (*read_proc)(char*,char**,off_t,int,int*,void*);
 609         } *p, simple_ones[] = {
 610                 {"loadavg",     loadavg_read_proc},
 611                 {"uptime",      uptime_read_proc},
 612                 {"meminfo",     meminfo_read_proc},
 613                 {"version",     version_read_proc},
 614 #ifdef CONFIG_PROC_HARDWARE
 615                 {"hardware",    hardware_read_proc},
 616 #endif
 617 #ifdef CONFIG_STRAM_PROC
 618                 {"stram",       stram_read_proc},
 619 #endif
 620                 {"devices",     devices_read_proc},
 621                 {"filesystems", filesystems_read_proc},
 622                 {"cmdline",     cmdline_read_proc},
 623                 {"locks",       locks_read_proc},
 624                 {"execdomains", execdomains_read_proc},
 625                 {NULL,}
 626         };
 627         for (p = simple_ones; p->name; p++)
 628                 create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
 629
 630         proc_symlink("mounts", NULL, "self/mounts");
 631
 632         /* And now for trickier ones */
 633         entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
 634         if (entry)
 635                 entry->proc_fops = &proc_kmsg_operations;
 636         create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
 637         create_seq_entry("partitions", 0, &proc_partitions_operations);
 638         create_seq_entry("stat", 0, &proc_stat_operations);
 639         create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 640         create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
 641         create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 642         create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
 643         create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 644 #ifdef CONFIG_MODULES
 645         create_seq_entry("modules", 0, &proc_modules_operations);
 646 #endif
 647 #ifdef CONFIG_SCHEDSTATS
 648         create_seq_entry("schedstat", 0, &proc_schedstat_operations);
 649 #endif
 650 #ifdef CONFIG_PROC_KCORE
 651         proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 652         if (proc_root_kcore) {
 653                 proc_root_kcore->proc_fops = &proc_kcore_operations;
 654                 proc_root_kcore->size =
 655                                 (size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 656         }
 657 #endif
 658 #ifdef CONFIG_MAGIC_SYSRQ
 659         entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
 660         if (entry)
 661                 entry->proc_fops = &proc_sysrq_trigger_operations;
 662 #endif
 663 #ifdef CONFIG_PPC32
 664         {
 665                 extern struct file_operations ppc_htab_operations;
 666                 entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
 667                 if (entry)
 668                         entry->proc_fops = &ppc_htab_operations;
 669         }
 670 #endif
 671 }