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
  19 /*
  20  * Allow cropping out bits beyond the end of the array.
  21  * Move to "lib" directory if more clients want to use this routine.
  22  */
  23 int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits)
  24 {
  25         unsigned a, b;
  26
  27         bitmap_zero(maskp, nmaskbits);
  28         do {
  29                 if (!isdigit(*bp))
  30                         return -EINVAL;
  31                 a = simple_strtoul(bp, (char **)&bp, 10);
  32                 b = a;
  33                 if (*bp == '-') {
  34                         bp++;
  35                         if (!isdigit(*bp))
  36                                 return -EINVAL;
  37                         b = simple_strtoul(bp, (char **)&bp, 10);
  38                 }
  39                 if (!(a <= b))
  40                         return -EINVAL;
  41                 if (b >= nmaskbits)
  42                         b = nmaskbits-1;
  43                 while (a <= b) {
  44                         set_bit(a, maskp);
  45                         a++;
  46                 }
  47                 if (*bp == ',')
  48                         bp++;
  49         } while (*bp != '\0' && *bp != '\n');
  50         return 0;
  51 }