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powerpc: put the "zero usp means using parent's stack pointer" to copy_thread() 

simplifies callers, at that...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-21 22:28:43 -04:00
parent 64c2f6596b
commit ea516b1154
1 changed files with 4 additions and 5 deletions
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9
arch/powerpc/kernel/process.c
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@ -761,7 +761,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
} else {
CHECK_FULL_REGS(regs);
*childregs = *regs;
childregs->gpr[1] = usp;
if (usp)
childregs->gpr[1] = usp;
p->thread.regs = childregs;
childregs->gpr[3] = 0; /* Result from fork() */
if (clone_flags & CLONE_SETTLS) {
@ -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);
}