cpumask.c

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/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

#include <linux/cpumask.h>
#include <linux/ctype.h>
#include <linux/errno.h>
#include <linux/smp.h>

/*
 * Allow cropping out bits beyond the end of the array.
 * Move to "lib" directory if more clients want to use this routine.
 */
int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits)
{
    unsigned a, b;

    bitmap_zero(maskp, nmaskbits);
    do {
        if (!isdigit(*bp))
            return -EINVAL;
        a = simple_strtoul(bp, (char **)&bp, 10);
        b = a;
        if (*bp == '-') {
            bp++;
            if (!isdigit(*bp))
                return -EINVAL;
            b = simple_strtoul(bp, (char **)&bp, 10);
        }
        if (!(a <= b))
            return -EINVAL;
        if (b >= nmaskbits)
            b = nmaskbits-1;
        while (a <= b) {
            set_bit(a, maskp);
            a++;
        }
        if (*bp == ',')
            bp++;
    } while (*bp != '\0' && *bp != '\n');
    return 0;
}