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e16d02ee3f
Introduce a text_poke_sync() similar to what x86 has. This can be used to execute a serializing instruction on all CPUs (including the current one). Note: according to the Principles of Operation an IPI (= interrupt) will already serialize a CPU, however it is better to be explicit. In addition on_each_cpu() makes sure that also the current CPU get serialized - just to make sure that possible preemption can prevent some theoretical case where a CPU will not be serialized. Therefore text_poke_sync() has to be used whenever code got modified, just to avoid to rely on implicit serialization. Also introduce text_poke_sync_lock() which will also disable CPU hotplug, to prevent that any CPU is just going online with a prefetched old version of a modified instruction. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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