powerpc: switch to generic fork/clone/vfork

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/powerpc/Kconfig

@@ -145,6 +145,7 @@ config PPC
 	select HAVE_MOD_ARCH_SPECIFIC
 	select MODULES_USE_ELF_RELA
 	select GENERIC_KERNEL_EXECVE
+	select CLONE_BACKWARDS
 
 config EARLY_PRINTK
 	bool

arch/powerpc/include/asm/syscalls.h

@@ -17,15 +17,6 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, size_t len,
 asmlinkage unsigned long sys_mmap2(unsigned long addr, size_t len,
 		unsigned long prot, unsigned long flags,
 		unsigned long fd, unsigned long pgoff);
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long usp,
-		int __user *parent_tidp, void __user *child_threadptr,
-		int __user *child_tidp, int p6, struct pt_regs *regs);
-asmlinkage int sys_fork(unsigned long p1, unsigned long p2,
-		unsigned long p3, unsigned long p4, unsigned long p5,
-		unsigned long p6, struct pt_regs *regs);
-asmlinkage int sys_vfork(unsigned long p1, unsigned long p2,
-		unsigned long p3, unsigned long p4, unsigned long p5,
-		unsigned long p6, struct pt_regs *regs);
 asmlinkage long sys_pipe(int __user *fildes);
 asmlinkage long sys_pipe2(int __user *fildes, int flags);
 asmlinkage long sys_rt_sigaction(int sig,

arch/powerpc/include/asm/unistd.h

@@ -56,6 +56,9 @@
 #define __ARCH_WANT_COMPAT_SYS_SENDFILE
 #endif
 #define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_SYS_FORK
+#define __ARCH_WANT_SYS_VFORK
+#define __ARCH_WANT_SYS_CLONE
 
 /*
  * "Conditional" syscalls

arch/powerpc/kernel/process.c

@@ -1026,29 +1026,6 @@ int get_unalign_ctl(struct task_struct *tsk, unsigned long adr)
 	return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr);
 }
 
-int sys_clone(unsigned long clone_flags, unsigned long usp,
-	      int __user *parent_tidp, void __user *child_threadptr,
-	      int __user *child_tidp, int p6,
-	      struct pt_regs *regs)
-{
- 	return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
-}
-
-int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
-	     unsigned long p4, unsigned long p5, unsigned long p6,
-	     struct pt_regs *regs)
-{
-	return do_fork(SIGCHLD, 0, regs, 0, NULL, NULL);
-}
-
-int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
-	      unsigned long p4, unsigned long p5, unsigned long p6,
-	      struct pt_regs *regs)
-{
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
-			regs, 0, NULL, NULL);
-}
-
 static inline int valid_irq_stack(unsigned long sp, struct task_struct *p,
 				  unsigned long nbytes)
 {