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s390/ftrace: add missing serialization for graph caller patching

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CPUs must be serialized also when ftrace_graph_caller gets patched.
This is missing since ftrace function graph support was added on s390.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-10-01 14:24:42 +02:00 • committed by Vasily Gorbik
parent ae2b9a11b4
commit e5873d6f7a
1 changed files with 2 additions and 0 deletions
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2
arch/s390/kernel/ftrace.c
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@ -268,12 +268,14 @@ NOKPROBE_SYMBOL(prepare_ftrace_return);
int ftrace_enable_ftrace_graph_caller(void)
{
brcl_disable(ftrace_graph_caller);
text_poke_sync_lock();
return 0;
}
int ftrace_disable_ftrace_graph_caller(void)
{
brcl_enable(ftrace_graph_caller);
text_poke_sync_lock();
return 0;
}