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| author |   Thomas Gleixner <tglx@linutronix.de> | 2017-05-24 10:15:38 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-05-26 10:10:46 +0200 |
| commit | 9489cc8f370be811f7e741a772bcce88b712272d (patch) | |
| tree | 83430d550a65809411d03679afc70c3b3c0deaef /arch/arm/kernel/patch.c | |
| parent | arm64: Prevent cpu hotplug rwsem recursion (diff) | |
| download | linux-dev-9489cc8f370be811f7e741a772bcce88b712272d.tar.xz linux-dev-9489cc8f370be811f7e741a772bcce88b712272d.zip | |
arm: 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>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20170524081549.275871311@linutronix.de
Diffstat (limited to 'arch/arm/kernel/patch.c')
| -rw-r--r-- | arch/arm/kernel/patch.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kernel/patch.c b/arch/arm/kernel/patch.c index 020560b2dcb7..a1a34722c655 100644 --- a/arch/arm/kernel/patch.c +++ b/arch/arm/kernel/patch.c @@ -124,5 +124,5 @@ void __kprobes patch_text(void *addr, unsigned int insn) .insn = insn, }; - stop_machine(patch_text_stop_machine, &patch, NULL); + stop_machine_cpuslocked(patch_text_stop_machine, &patch, NULL); } |