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

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

1 files changed, 2 insertions, 1 deletions

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;