uml: simplify helper stack handling

run_helper and run_helper_thread had arguments which were the same in all
callers.  run_helper's stack_out was always NULL and run_helper_thread's
stack_order was always 0.  These are now gone, and the constants folded
into the code.

Also fixed leaks of the helper stack in the AIO and SIGIO code.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 2 deletions

diff --git a/arch/um/os-Linux/drivers/ethertap_user.c b/arch/um/os-Linux/drivers/ethertap_user.c
index acba3016128..cac01b31ea9 100644
--- a/arch/um/os-Linux/drivers/ethertap_user.c
+++ b/arch/um/os-Linux/drivers/ethertap_user.c
@@ -117,7 +117,7 @@ static int etap_tramp(char *dev, char *gate, int control_me,
         pe_data.control_remote = control_remote;
         pe_data.control_me = control_me;
         pe_data.data_me = data_me;
-        pid = run_helper(etap_pre_exec, &pe_data, args, NULL);
+        pid = run_helper(etap_pre_exec, &pe_data, args);
 
         if(pid < 0)
                 err = pid;
diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c
index 11a9779dc9f..f848b4ea934 100644
--- a/arch/um/os-Linux/drivers/tuntap_user.c
+++ b/arch/um/os-Linux/drivers/tuntap_user.c
@@ -83,7 +83,7 @@ static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
         data.stdout = remote;
         data.close_me = me;
 
-        pid = run_helper(tuntap_pre_exec, &data, argv, NULL);
+        pid = run_helper(tuntap_pre_exec, &data, argv);
 
         if(pid < 0)
                 return -pid;