kconfig: allow specifying the seed for randconfig (0d8024c6) · Commits · 戴 / test

Documentation/kbuild/kconfig.txt

+9 −0

Original line number	Diff line number	Diff line
		@@ -89,6 +89,15 @@ These examples will disable most options (allnoconfig) but enable or
		disable the options that are explicitly listed in the specified
		mini-config files.

		______________________________________________________________________
		Environment variables for 'randconfig'

		KCONFIG_SEED
		--------------------------------------------------
		You can set this to the integer value used to seed the RNG, if you want
		to somehow debug the behaviour of the kconfig parser/frontends.
		If not set, the current time will be used.

		______________________________________________________________________
		Environment variables for 'silentoldconfig'

+11 −1

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		#include <getopt.h>
		#include <sys/stat.h>
		#include <sys/time.h>
		#include <errno.h>

		#include "lkc.h"

		@@ -514,14 +515,23 @@ int main(int ac, char **av)
		{
		struct timeval now;
		unsigned int seed;
		char *seed_env;

		/*
		* Use microseconds derived seed,
		* compensate for systems where it may be zero
		*/
		gettimeofday(&now, NULL);

		seed = (unsigned int)((now.tv_sec + 1) * (now.tv_usec + 1));

		seed_env = getenv("KCONFIG_SEED");
		if( seed_env && *seed_env ) {
		char *endp;
		int tmp = (int)strtol(seed_env, &endp, 10);
		if (*endp == '\0') {
		seed = tmp;
		}
		}
		srand(seed);
		break;
		}