arch/tile/lib/cpumask.c

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #include <linux/cpumask.h>
  16 #include <linux/ctype.h>
  17 #include <linux/errno.h>
  18 #include <linux/smp.h>
  19 #include <linux/export.h>
  20
  21 /*
  22  * Allow cropping out bits beyond the end of the array.
  23  * Move to "lib" directory if more clients want to use this routine.
  24  */
  25 int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits)
  26 {
  27         unsigned a, b;
  28
  29         bitmap_zero(maskp, nmaskbits);
  30         do {
  31                 if (!isdigit(*bp))
  32                         return -EINVAL;
  33                 a = simple_strtoul(bp, (char **)&bp, 10);
  34                 b = a;
  35                 if (*bp == '-') {
  36                         bp++;
  37                         if (!isdigit(*bp))
  38                                 return -EINVAL;
  39                         b = simple_strtoul(bp, (char **)&bp, 10);
  40                 }
  41                 if (!(a <= b))
  42                         return -EINVAL;
  43                 if (b >= nmaskbits)
  44                         b = nmaskbits-1;
  45                 while (a <= b) {
  46                         set_bit(a, maskp);
  47                         a++;
  48                 }
  49                 if (*bp == ',')
  50                         bp++;
  51         } while (*bp != '\0' && *bp != '\n');
  52         return 0;
  53 }
  54 EXPORT_SYMBOL(bitmap_parselist_crop);