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authorMichael Holzheu <holzheu@linux.vnet.ibm.com>2011-12-27 11:27:08 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-12-27 11:27:10 +0100
commit3931723f36165e137c67b8c62346024a6c4f223d (patch)
tree15fe811534c833e805bbbb423abcfe264d2f08cb /arch/s390/kernel
parent14045ebf1e1156d966a796cacad91028e01797e5 (diff)
downloadlinux-3931723f36165e137c67b8c62346024a6c4f223d.tar.bz2
[S390] kernel: Fix smp_switch_to_ipl_cpu() stack frame setup
Currently, when smp_switch_to_ipl_cpu() is done, the backchain in the dump analysis tool crash looks like the following: #0 [1f746e70] __machine_kexec at 11dd92 #1 [1f746eb8] smp_restart_cpu at 11820e #0 [00907eb0] cpu_idle at 10602e #1 [00907ef8] start_kernel at 979a08 It would be good to see the registers of the interrupted function. To achieve this, the backchain on the new stack has to be set to zero. This looks then like the following: #0 [1f746e70] __machine_kexec at 11dd8e #1 [1f746eb8] smp_restart_cpu at 11820a PSW: 0706000180000000 00000000005c6fe6 (vtime_stop_cpu+134) GPRS: 0000000000000000 00000000005c6fe6 0000000001ad0228 0000000001ad0248 0000000000907f08 0000000001ad0b40 0000000000979344 0000000000000000 00000000009c0000 00000000009c0010 00000000009ab024 0000000001ad0200 0000000001ad0238 00000000005cc9d8 000000000010602e 0000000000907e68 #0 [00907eb0] cpu_idle at 10602e #1 [00907ef8] start_kernel at 979a08 In addition to this, now also the correct PSW is stored in the pt_regs structure that is located at the start of the panic stack. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/smp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index ee327365e436..14d5211a185d 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -149,10 +149,10 @@ void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
sp -= sizeof(struct pt_regs);
regs = (struct pt_regs *) sp;
memcpy(&regs->gprs, &current_lc->gpregs_save_area, sizeof(regs->gprs));
- regs->psw = lc->psw_save_area;
+ regs->psw = current_lc->psw_save_area;
sp -= STACK_FRAME_OVERHEAD;
sf = (struct stack_frame *) sp;
- sf->back_chain = regs->gprs[15];
+ sf->back_chain = 0;
smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
}