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kernel: use kernel_wait4() instead of sys_wait4()

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All call sites of sys_wait4() set *rusage to NULL. Therefore, there is
no need for the copy_to_user() handling of *rusage, and we can use
kernel_wait4() directly.

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/[email protected]

Acked-by: Luis R. Rodriguez <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Dominik Brodowski <[email protected]>
This commit is contained in:
Dominik Brodowski 2018-03-11 11:34:26 +01:00
commit d300b61081
3 changed files with 6 additions and 6 deletions
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4
kernel/umh.c
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@ -118,7 +118,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
{
pid_t pid;
/* If SIGCLD is ignored sys_wait4 won't populate the status. */
/* If SIGCLD is ignored kernel_wait4 won't populate the status. */
kernel_sigaction(SIGCHLD, SIG_DFL);
pid = kernel_thread(call_usermodehelper_exec_async, sub_info, SIGCHLD);
if (pid < 0) {
@ -135,7 +135,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
*
* Thus the __user pointer cast is valid here.
*/
sys_wait4(pid, (int __user *)&ret, 0, NULL);
kernel_wait4(pid, (int __user *)&ret, 0, NULL);
/*
* If ret is 0, either call_usermodehelper_exec_async failed and