From e7e78456b4aa3c087129b9dec0ad90b1cedec57f Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Tue, 1 Feb 2011 15:52:30 -0800 Subject: [PATCH] memsw: handle swapaccount kernel parameter correctly commit fceda1bf498677501befc7da72fd2e4de7f18466 upstream. __setup based kernel command line parameters handlers which are handled in obsolete_checksetup are provided with the parameter value including = (more precisely everything right after the parameter name). This means that the current implementation of swapaccount[=1|0] doesn't work at all because if there is a value for the parameter then we are testing for "0" resp. "1" but we are getting "=0" resp. "=1" and if there is no parameter value we are getting an empty string rather than NULL. The original noswapccount parameter, which doesn't care about the value, works correctly. Signed-off-by: Michal Hocko Acked-by: KAMEZAWA Hiroyuki Cc: Daisuke Nishimura Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- mm/memcontrol.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 1654bd460a36..d7a1e3da4d0f 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4930,9 +4930,9 @@ struct cgroup_subsys mem_cgroup_subsys = { static int __init enable_swap_account(char *s) { /* consider enabled if no parameter or 1 is given */ - if (!s || !strcmp(s, "1")) + if (!(*s) || !strcmp(s, "=1")) really_do_swap_account = 1; - else if (!strcmp(s, "0")) + else if (!strcmp(s, "=0")) really_do_swap_account = 0; return 1; } @@ -4940,7 +4940,7 @@ __setup("swapaccount", enable_swap_account); static int __init disable_swap_account(char *s) { - enable_swap_account("0"); + enable_swap_account("=0"); return 1; } __setup("noswapaccount", disable_swap_account); -- 2.11.4.GIT