powerpc: put the "zero usp means using parent's stack pointer" to copy_thread() (ea516b11) · Commits · 戴 / test

arch/powerpc/kernel/process.c

+4 −5

Original line number	Diff line number	Diff line
		@@ -761,6 +761,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
		} else {
		CHECK_FULL_REGS(regs);
		childregs = regs;
		if (usp)
		childregs->gpr[1] = usp;
		p->thread.regs = childregs;
		childregs->gpr[3] = 0; /* Result from fork() */
		@@ -1030,8 +1031,6 @@ int sys_clone(unsigned long clone_flags, unsigned long usp,
		int __user *child_tidp, int p6,
		struct pt_regs *regs)
		{
		if (usp == 0)
		usp = regs->gpr[1]; /* stack pointer for child */
		return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
		}

		@@ -1039,14 +1038,14 @@ 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, regs->gpr[1], regs, 0, NULL, NULL);
		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, regs->gpr[1],
		return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, 0,
		regs, 0, NULL, NULL);
		}