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s390/ftrace: add ftrace_graph_is_dead() check

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Add an ftrace_graph_is_dead() check to prepare_ftrace_return() in order to
detect an internal ftrace graph error. This allows to prevent further ftrace
graph handling and hopefully keeps the kernel alive.

This patch is the same like for all other architectures.
For unkown reasons s390 was left out.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2014-10-27 15:49:06 +01:00 committed by Martin Schwidefsky
parent e43b49a0cb
commit 6ed15ea67b
1 changed files with 2 additions and 0 deletions
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2
arch/s390/kernel/ftrace.c
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@ -121,6 +121,8 @@ unsigned long __kprobes prepare_ftrace_return(unsigned long parent,
{
struct ftrace_graph_ent trace;
if (unlikely(ftrace_graph_is_dead()))
goto out;
if (unlikely(atomic_read(&current->tracing_graph_pause)))
goto out;
ip = (ip & PSW_ADDR_INSN) - MCOUNT_INSN_SIZE;