[PATCH 6/7] hexagon: set the user stack pointer in start_thread

[Brian Cain <brian.cain@oss.qualcomm.com>]

start_thread() set only the stack pointer that vmrte restores on the way
back to user mode, leaving the copy in pt_regs holding whatever the
previous thread had.  A ptrace stop between execve() and the first return
to user mode therefore reported a stale r29.  Set both.

Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>
---
 arch/hexagon/kernel/process.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/hexagon/kernel/process.c b/arch/hexagon/kernel/process.c
index f5e9934c36e3..6953c4b1fd5c 100644
--- a/arch/hexagon/kernel/process.c
+++ b/arch/hexagon/kernel/process.c
@@ -16,6 +16,7 @@
 #include <linux/uaccess.h>
 #include <linux/slab.h>
 #include <linux/resume_user_mode.h>
+#include <asm/hexagon_vm.h>
 
 /*
  * Program thread launch.  Often defined as a macro in processor.h,
@@ -33,6 +34,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
 	/* We might want to also zero all Processor registers here */
 	pt_set_usermode(regs);
 	pt_set_elr(regs, pc);
+	regs->r29 = sp;
 	pt_set_rte_sp(regs, sp);
 }
 
-- 
2.34.1