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authorHeiko Carstens <heiko.carstens@de.ibm.com>2016-02-09 14:03:31 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-02-10 11:25:22 +0300
commit232f5dd78586a684a7364a486b934e19384189dc (patch)
tree62b37beadca4caa0f1a6826005240296ea03f27f /arch/s390/oprofile
parent1f8cbb9c8365061d8b866e9b4f4403e029d57989 (diff)
downloadlinux-232f5dd78586a684a7364a486b934e19384189dc.tar.xz
s390/oprofile: fix address range for asynchronous stack
git commit dc7ee00d4771 ("s390: lowcore stack pointer offsets") introduced a regression in regard to s390_backtrace(). The stack pointer for the asynchronous stack in the lowcore now has an additional offset applied. This offset needs to be taken into account in the calculation for the low and high address for the stack. This bug was already partially fixed with commit 9cc5c206d9b4 ("s390/dumpstack: fix address ranges for asynchronous and panic stack"). This patch fixes it also for the oprofile code. Fixes: dc7ee00d4771 ("s390: lowcore stack pointer offsets") Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/oprofile')
-rw-r--r--arch/s390/oprofile/backtrace.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/s390/oprofile/backtrace.c b/arch/s390/oprofile/backtrace.c
index fe0bfe370c45..1884e1759529 100644
--- a/arch/s390/oprofile/backtrace.c
+++ b/arch/s390/oprofile/backtrace.c
@@ -54,12 +54,13 @@ __show_trace(unsigned int *depth, unsigned long sp,
void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
{
- unsigned long head;
+ unsigned long head, frame_size;
struct stack_frame* head_sf;
if (user_mode(regs))
return;
+ frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
head = regs->gprs[15];
head_sf = (struct stack_frame*)head;
@@ -68,8 +69,9 @@ void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
head = head_sf->back_chain;
- head = __show_trace(&depth, head, S390_lowcore.async_stack - ASYNC_SIZE,
- S390_lowcore.async_stack);
+ head = __show_trace(&depth, head,
+ S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
+ S390_lowcore.async_stack + frame_size);
__show_trace(&depth, head, S390_lowcore.thread_info,
S390_lowcore.thread_info + THREAD_SIZE);