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uml: simplify helper stack handling

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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>
This commit is contained in:
Jeff Dike
2007-07-15 23:38:56 -07:00
committed by Linus Torvalds
parent 42a359e31a
commit c43990162f
13 changed files with 36 additions and 37 deletions
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19
arch/um/os-Linux/sigio.c
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@ -26,6 +26,7 @@
* exitcall.
*/
static int write_sigio_pid = -1;
static unsigned long write_sigio_stack;
/* These arrays are initialized before the sigio thread is started, and
* the descriptors closed after it is killed. So, it can't see them change.
@ -144,8 +145,10 @@ static void update_thread(void)
return;
fail:
/* Critical section start */
if(write_sigio_pid != -1)
if (write_sigio_pid != -1) {
os_kill_process(write_sigio_pid, 1);
free_stack(write_sigio_stack, 0);
}
write_sigio_pid = -1;
close(sigio_private[0]);
close(sigio_private[1]);
@ -243,7 +246,6 @@ static struct pollfd *setup_initial_poll(int fd)
static void write_sigio_workaround(void)
{
unsigned long stack;
struct pollfd *p;
int err;
int l_write_sigio_fds[2];
@ -293,7 +295,8 @@ static void write_sigio_workaround(void)
memcpy(sigio_private, l_sigio_private, sizeof(l_sigio_private));
write_sigio_pid = run_helper_thread(write_sigio_thread, NULL,
CLONE_FILES | CLONE_VM, &stack, 0);
CLONE_FILES | CLONE_VM,
&write_sigio_stack);
if (write_sigio_pid < 0)
goto out_clear;
@ -356,10 +359,12 @@ out:
static void sigio_cleanup(void)
{
if(write_sigio_pid != -1){
os_kill_process(write_sigio_pid, 1);
write_sigio_pid = -1;
}
if (write_sigio_pid == -1)
return;
os_kill_process(write_sigio_pid, 1);
free_stack(write_sigio_stack, 0);
write_sigio_pid = -1;
}
__uml_exitcall(sigio_cleanup);