diff options
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 64 |
1 files changed, 48 insertions, 16 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 79de9f99a48d..3c31e874afad 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1129,7 +1129,6 @@ static void posix_cpu_timers_init(struct task_struct *tsk) */ static struct task_struct *copy_process(unsigned long clone_flags, unsigned long stack_start, - struct pt_regs *regs, unsigned long stack_size, int __user *child_tidptr, struct pid *pid, @@ -1321,7 +1320,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, retval = copy_io(clone_flags, p); if (retval) goto bad_fork_cleanup_namespaces; - retval = copy_thread(clone_flags, stack_start, stack_size, p, regs); + retval = copy_thread(clone_flags, stack_start, stack_size, p); if (retval) goto bad_fork_cleanup_io; @@ -1510,12 +1509,6 @@ fork_out: return ERR_PTR(retval); } -noinline struct pt_regs * __cpuinit __attribute__((weak)) idle_regs(struct pt_regs *regs) -{ - memset(regs, 0, sizeof(struct pt_regs)); - return regs; -} - static inline void init_idle_pids(struct pid_link *links) { enum pid_type type; @@ -1529,10 +1522,7 @@ static inline void init_idle_pids(struct pid_link *links) struct task_struct * __cpuinit fork_idle(int cpu) { struct task_struct *task; - struct pt_regs regs; - - task = copy_process(CLONE_VM, 0, idle_regs(®s), 0, NULL, - &init_struct_pid, 0); + task = copy_process(CLONE_VM, 0, 0, NULL, &init_struct_pid, 0); if (!IS_ERR(task)) { init_idle_pids(task->pids); init_idle(task, cpu); @@ -1549,7 +1539,6 @@ struct task_struct * __cpuinit fork_idle(int cpu) */ long do_fork(unsigned long clone_flags, unsigned long stack_start, - struct pt_regs *regs, unsigned long stack_size, int __user *parent_tidptr, int __user *child_tidptr) @@ -1579,7 +1568,7 @@ long do_fork(unsigned long clone_flags, * requested, no event is reported; otherwise, report if the event * for the type of forking is enabled. */ - if (!(clone_flags & CLONE_UNTRACED) && likely(user_mode(regs))) { + if (!(clone_flags & CLONE_UNTRACED)) { if (clone_flags & CLONE_VFORK) trace = PTRACE_EVENT_VFORK; else if ((clone_flags & CSIGNAL) != SIGCHLD) @@ -1591,7 +1580,7 @@ long do_fork(unsigned long clone_flags, trace = 0; } - p = copy_process(clone_flags, stack_start, regs, stack_size, + p = copy_process(clone_flags, stack_start, stack_size, child_tidptr, NULL, trace); /* * Do this prior waking up the new thread - the thread pointer @@ -1635,11 +1624,54 @@ long do_fork(unsigned long clone_flags, */ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) { - return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, NULL, + return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, (unsigned long)arg, NULL, NULL); } #endif +#ifdef __ARCH_WANT_SYS_FORK +SYSCALL_DEFINE0(fork) +{ +#ifdef CONFIG_MMU + return do_fork(SIGCHLD, 0, 0, NULL, NULL); +#else + /* can not support in nommu mode */ + return(-EINVAL); +#endif +} +#endif + +#ifdef __ARCH_WANT_SYS_VFORK +SYSCALL_DEFINE0(vfork) +{ + return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, + 0, NULL, NULL); +} +#endif + +#ifdef __ARCH_WANT_SYS_CLONE +#ifdef CONFIG_CLONE_BACKWARDS +SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, + int __user *, parent_tidptr, + int, tls_val, + int __user *, child_tidptr) +#elif defined(CONFIG_CLONE_BACKWARDS2) +SYSCALL_DEFINE5(clone, unsigned long, newsp, unsigned long, clone_flags, + int __user *, parent_tidptr, + int __user *, child_tidptr, + int, tls_val) +#else +SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, + int __user *, parent_tidptr, + int __user *, child_tidptr, + int, tls_val) +#endif +{ + return do_fork(clone_flags, newsp, 0, + parent_tidptr, child_tidptr); +} +#endif + #ifndef ARCH_MIN_MMSTRUCT_ALIGN #define ARCH_MIN_MMSTRUCT_ALIGN 0 #endif |