Stack unwinders need LR and the back chain as a minimum. The switch
stack uses regs->nip for its return pointer rather than lrsave, so
that was not filled in, and neither was the back chain.
With this and the previous change, a stack trace in the switch or
interrupt stack goes from looking like this:
Oops: Exception in kernel mode, sig: 5 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
Modules linked in:
CPU: 3 PID: 90 Comm: systemd Not tainted
NIP: c000000000011060 LR: c000000000010f68 CTR: 0000000000007fff
[ ... regs ... ]
NIP [c000000000011060] _switch+0x160/0x17c
LR [c000000000010f68] _switch+0x68/0x17c
Call Trace:
To this:
Oops: Exception in kernel mode, sig: 5 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
CPU: 0 PID: 93 Comm: systemd Not tainted
NIP: c000000000011060 LR: c000000000010f68 CTR: 0000000000007fff
[ ... regs ... ]
NIP [c000000000011060] _switch+0x160/0x17c
LR [c000000000010f68] _switch+0x68/0x17c
Call Trace:
[c000000005a93e10] [c00000000000cdbc] ret_from_fork_scv+0x0/0x54
--- interrupt: 3000 at 0x7fffa72f56d8
NIP: 00007fffa72f56d8 LR: 0000000000000000 CTR: 0000000000000000
[ ... regs ... ]
NIP [00007fffa72f56d8] 0x7fffa72f56d8
LR [0000000000000000] 0x0
--- interrupt: 3000
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
arch/powerpc/kernel/process.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 27956831fa5d..6cb3982a11ef 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1781,7 +1781,9 @@ int copy_thread(struct task_struct *p, const struct
kernel_clone_args *args)
* do some house keeping and then return from the fork or clone
* system call, using the stack frame created above.
*/
+ ((unsigned long *)sp)[STACK_FRAME_LR_SAVE] = (unsigned long)f;
sp -= STACK_SWITCH_FRAME_SIZE;
+ ((unsigned long *)sp)[0] = sp + STACK_SWITCH_FRAME_SIZE;
kregs = (struct pt_regs *)(sp + STACK_SWITCH_FRAME_REGS);
p->thread.ksp = sp;
--
2.37.2
