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
  20 /*
  21  * Allow cropping out bits beyond the end of the array.
  22  * Move to "lib" directory if more clients want to use this routine.
  23  */
  24 int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits)
  25 {
  26         unsigned a, b;
  27
  28         bitmap_zero(maskp, nmaskbits);
  29         do {
  30                 if (!isdigit(*bp))
  31                         return -EINVAL;
  32                 a = simple_strtoul(bp, (char **)&bp, 10);
  33                 b = a;
  34                 if (*bp == '-') {
  35                         bp++;
  36                         if (!isdigit(*bp))
  37                                 return -EINVAL;
  38                         b = simple_strtoul(bp, (char **)&bp, 10);
  39                 }
  40                 if (!(a <= b))
  41                         return -EINVAL;
  42                 if (b >= nmaskbits)
  43                         b = nmaskbits-1;
  44                 while (a <= b) {
  45                         set_bit(a, maskp);
  46                         a++;
  47                 }
  48                 if (*bp == ',')
  49                         bp++;
  50         } while (*bp != '\0' && *bp != '\n');
  51         return 0;
  52 }