s390: Prevent hotplug rwsem recursion
authorThomas Gleixner <tglx@linutronix.de>
Wed, 24 May 2017 08:15:39 +0000 (10:15 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Fri, 26 May 2017 08:10:46 +0000 (10:10 +0200)
commit5d5dbc4ef27e72104dea6102e4d1a1bf5a8ed971
treeff229fa7873a978b97d6da5506a285cb5711b6dd
parent9489cc8f370be811f7e741a772bcce88b712272d
s390: Prevent hotplug rwsem recursion

The text patching functions which are invoked from jump_label and kprobes
code are protected against cpu hotplug at the call sites.

Use stop_machine_cpuslocked() to avoid recursion on the cpu hotplug
rwsem. stop_machine_cpuslocked() contains a lockdep assertion to catch any
unprotected callers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: linux-s390@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20170524081549.354513406@linutronix.de
arch/s390/kernel/jump_label.c
arch/s390/kernel/kprobes.c