Commit a7c73414 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar

cpu/hotplug: Keep enough storage space if SMP=n to avoid array out of bounds scribble

Xiaolong Ye reported lock debug warnings triggered by the following commit:

  8de4a0066106 ("perf/x86: Convert the core to the hotplug state machine")

The bug is the following: the cpuhp_bp_states[] array is cut short when
CONFIG_SMP=n, but the dynamically registered callbacks are stored nevertheless
and happily scribble outside of the array bounds...

We need to store them in case that the state is unregistered so we can invoke
the teardown function. That's independent of CONFIG_SMP. Make sure the array
is large enough.
Reported-by: default avatarkernel test robot <xiaolong.ye@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Adam Borowski <kilobyte@angband.pl>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: lkp@01.org
Cc: stable@vger.kernel.org
Cc: tipbuild@zytor.com
Fixes: cff7d378 "cpu/hotplug: Convert to a state machine for the control processor"
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1607122144560.4083@nanosSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 0ea5ad86
...@@ -1201,6 +1201,8 @@ static struct cpuhp_step cpuhp_bp_states[] = { ...@@ -1201,6 +1201,8 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.teardown = takedown_cpu, .teardown = takedown_cpu,
.cant_stop = true, .cant_stop = true,
}, },
#else
[CPUHP_BRINGUP_CPU] = { },
#endif #endif
}; };
......
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