Man page 9 : bitmap_parse_user

bitmap_parse_user - convert an ASCII hex string in a user buffer into a bitmap

int bitmap_parse_user(const char __user *  ubuf , unsigned int  ulen , unsigned long *  maskp , int  nmaskbits );

ubuf
    pointer to user buffer containing string.

ulen
    buffer size in bytes. If string is smaller than this then it must be terminated with a \0.

maskp
    pointer to bitmap array that will contain result.

nmaskbits
    size of bitmap, in bits.

Wrapper for __bitmap_parse, providing it with user buffer.

We cannot have this as an inline function in bitmap.h because it needs linux/uaccess.h to get the access_ok declaration and this causes cyclic dependencies.