mips: take the "zero newsp means inherit the parent's one" to copy_thread()

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

3 files changed, 3 insertions, 6 deletions

diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 498a7ec656d8..9df3e330c37c 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -289,8 +289,6 @@ _sys32_clone(nabi_no_regargs struct pt_regs regs)
 
         clone_flags = regs.regs[4];
         newsp = regs.regs[5];
-        if (!newsp)
-                newsp = regs.regs[29];
         parent_tidptr = (int __user *) regs.regs[6];
 
         /* Use __dummy4 instead of getting it off the stack, so that
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index a11c6f9fdd5e..a33d2ef8f273 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -156,7 +156,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
         *childregs = *regs;
         childregs->regs[7] = 0; /* Clear error flag */
         childregs->regs[2] = 0; /* Child gets zero as return value */
-        childregs->regs[29] = usp;
+        if (usp)
+                childregs->regs[29] = usp;
         ti->addr_limit = USER_DS;
 
         p->thread.reg29 = (unsigned long) childregs;
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index 7e1c70dab767..28daa66baa7b 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -86,7 +86,7 @@ save_static_function(sys_fork);
 static int __used noinline
 _sys_fork(nabi_no_regargs struct pt_regs regs)
 {
-        return do_fork(SIGCHLD, regs.regs[29], 0, NULL, NULL);
+        return do_fork(SIGCHLD, 0, 0, NULL, NULL);
 }
 
 save_static_function(sys_clone);
@@ -99,8 +99,6 @@ _sys_clone(nabi_no_regargs struct pt_regs regs)
 
         clone_flags = regs.regs[4];
         newsp = regs.regs[5];
-        if (!newsp)
-                newsp = regs.regs[29];
         parent_tidptr = (int __user *) regs.regs[6];
 #ifdef CONFIG_32BIT
         /* We need to fetch the fifth argument off the stack.  */