[RFC PATCH 5/6] x86: use _do_fork() in compat_sys_x86_clone()

Dominik Brodowski
2018-03-18T16:11:59Z

It is trivial to directly call _do_fork() instead of the sys_clone()
syscall in compat_sys_x86_clone().

This patch is part of a series which tries to remove in-kernel calls to
syscalls. On this basis, the syscall entry path can be streamlined.

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: x86@kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
arch/x86/ia32/sys_ia32.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/ia32/sys_ia32.c b/arch/x86/ia32/sys_ia32.c
index 89dcb36d19da..31d50d11239b 100644
--- a/arch/x86/ia32/sys_ia32.c
+++ b/arch/x86/ia32/sys_ia32.c
@@ -41,6 +41,7 @@
#include <linux/highuid.h>
#include <linux/sysctl.h>
#include <linux/slab.h>
+#include <linux/sched/task.h>
#include <asm/mman.h>
#include <asm/types.h>
#include <linux/uaccess.h>
@@ -204,6 +205,6 @@ COMPAT_SYSCALL_DEFINE5(x86_clone, unsigned long, clone_flags,
unsigned long, newsp, int __user *, parent_tidptr,
unsigned long, tls_val, int __user *, child_tidptr)
{
- return sys_clone(clone_flags, newsp, parent_tidptr, child_tidptr,
+ return _do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr,
tls_val);
}
--
2.16.2