summaryrefslogtreecommitdiffstats
path: root/arch/um/kernel
diff options
context:
space:
mode:
authorAl Viro <viro@zeniv.linux.org.uk>2012-09-20 09:28:25 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-09-20 10:49:09 -0400
commita4d94ff8aa864c05b33c2de1f8c5d0176d7a4b63 (patch)
tree5edabf2ba151a15240d663fcde44a15d98c9572d /arch/um/kernel
parent8e2c85aa6c7a158d967db75931db7f13d20d31f4 (diff)
downloadop-kernel-dev-a4d94ff8aa864c05b33c2de1f8c5d0176d7a4b63.zip
op-kernel-dev-a4d94ff8aa864c05b33c2de1f8c5d0176d7a4b63.tar.gz
um: kill thread->forking
we only use that to tell copy_thread() done by syscall from that done by kernel_thread(). However, it's easier to do simply by checking PF_KTHREAD in thread flags. Merge sys_clone() guts for 32bit and 64bit, while we are at it... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/um/kernel')
-rw-r--r--arch/um/kernel/process.c8
-rw-r--r--arch/um/kernel/syscall.c24
2 files changed, 16 insertions, 16 deletions
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 57fc702..c5f5afa 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -181,11 +181,12 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
struct pt_regs *regs)
{
void (*handler)(void);
+ int kthread = current->flags & PF_KTHREAD;
int ret = 0;
p->thread = (struct thread_struct) INIT_THREAD;
- if (current->thread.forking) {
+ if (!kthread) {
memcpy(&p->thread.regs.regs, &regs->regs,
sizeof(p->thread.regs.regs));
PT_REGS_SET_SYSCALL_RETURN(&p->thread.regs, 0);
@@ -195,8 +196,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
handler = fork_handler;
arch_copy_thread(&current->thread.arch, &p->thread.arch);
- }
- else {
+ } else {
get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
p->thread.request.u.thread = current->thread.request.u.thread;
handler = new_thread_handler;
@@ -204,7 +204,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
- if (current->thread.forking) {
+ if (!kthread) {
clear_flushed_tls(p);
/*
diff --git a/arch/um/kernel/syscall.c b/arch/um/kernel/syscall.c
index f958cb8..a4c6d8e 100644
--- a/arch/um/kernel/syscall.c
+++ b/arch/um/kernel/syscall.c
@@ -17,25 +17,25 @@
long sys_fork(void)
{
- long ret;
-
- current->thread.forking = 1;
- ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
+ return do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),
&current->thread.regs, 0, NULL, NULL);
- current->thread.forking = 0;
- return ret;
}
long sys_vfork(void)
{
- long ret;
-
- current->thread.forking = 1;
- ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
UPT_SP(&current->thread.regs.regs),
&current->thread.regs, 0, NULL, NULL);
- current->thread.forking = 0;
- return ret;
+}
+
+long sys_clone(unsigned long clone_flags, unsigned long newsp,
+ void __user *parent_tid, void __user *child_tid)
+{
+ if (!newsp)
+ newsp = UPT_SP(&current->thread.regs.regs);
+
+ return do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
+ child_tid);
}
long old_mmap(unsigned long addr, unsigned long len,
OpenPOWER on IntegriCloud