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authorBrian Gerst <brgerst@gmail.com>2009-12-09 12:34:40 -0500
committerH. Peter Anvin <hpa@zytor.com>2009-12-10 15:55:26 -0800
commit3bd95dfb182969dc6d2a317c150e0df7107608d3 (patch)
tree8624969693d1bb51f06f85c35b7ac84ef41b9aeb /arch/x86/kernel/process_64.c
parentfc380ceed7fe469728ea4acdbda4495ea943ee1c (diff)
x86, 64-bit: Move kernel_thread to C
Prepare for merging with 32-bit. Signed-off-by: Brian Gerst <brgerst@gmail.com> LKML-Reference: <1260380084-3707-2-git-send-email-brgerst@gmail.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
-rw-r--r--arch/x86/kernel/process_64.c31
1 files changed, 29 insertions, 2 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 83019f94b83d..92484c2130c6 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -59,8 +59,6 @@ asmlinkage extern void ret_from_fork(void);
DEFINE_PER_CPU(unsigned long, old_rsp);
static DEFINE_PER_CPU(unsigned char, is_idle);
-unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;
-
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
void idle_notifier_register(struct notifier_block *n)
@@ -231,6 +229,35 @@ void show_regs(struct pt_regs *regs)
show_trace(NULL, regs, (void *)(regs + 1), regs->bp);
}
+/*
+ * This gets run with %si containing the
+ * function to call, and %di containing
+ * the "args".
+ */
+extern void kernel_thread_helper(void);
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+ struct pt_regs regs;
+
+ memset(&regs, 0, sizeof(regs));
+
+ regs.si = (unsigned long) fn;
+ regs.di = (unsigned long) arg;
+
+ regs.orig_ax = -1;
+ regs.ip = (unsigned long) kernel_thread_helper;
+ regs.cs = __KERNEL_CS;
+ regs.flags = X86_EFLAGS_IF;
+
+ /* Ok, create the new process.. */
+ return do_fork(flags | CLONE_VM | CLONE_UNTRACED, ~0UL, &regs, 0, NULL, NULL);
+}
+EXPORT_SYMBOL(kernel_thread);
+
void release_thread(struct task_struct *dead_task)
{
if (dead_task->mm) {