[RFC PATCH v3] ARM: uprobes need icache flush after xol write

[David Miller]

From: Oleg Nesterov <oleg at redhat.com>
Date: Wed, 16 Apr 2014 17:06:46 +0200

> Off-topic, I am just curious... can't someone explain why flush_pfn_alias()
> or flush_icache_alias() can't race with itself ? I have no idea what they do,
> but what if another thread calls the same function with the same CACHE_COLOUR()
> right after set_pte_ext?

PTE modifications are supposed to run with the page table lock held.