strings and command line args

[Peter Jay Salzman <p@dirac.org>]

i'm trying to understand (in linux/module.h):

   /* Indirect stringification.  */
#define __MODULE_STRING_1(x)  #x
#define __MODULE_STRING(x) __MODULE_STRING_1(x)

which is used alot in MODULE_PARM (in linux/module.h):

   MODULE_PARM(mac, "1-" __MODULE_STRING(NS_MAX_CARDS) "s");


what is __MODULE_STRING() used for?  in what sense does it perform
"stringification"?


also, i'm not understanding the 2nd argument of MODULE_PARM.  i'd be
happier with:

   MODULE_PARM(mac, "s");

there are two other items: "1-" and __MODULE_STRING(NS_MAX_CARDS).  they
belong to the 2nd argument, which identifies the type of the command
line argument.  i would've thought that would simply be "s" for a
string.  what do the two other items do?

thanks!
pete

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