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

[Oleg Nesterov]

On 04/15, Victor Kamensky wrote:
>
>  arch/arm/include/asm/cacheflush.h |  2 ++
>  arch/arm/kernel/uprobes.c         | 22 ++++++++++++++++++++++
>  arch/arm/mm/flush.c               | 33 ++++++++++++++++++++++++++++-----
>  include/linux/uprobes.h           |  3 +++
>  kernel/events/uprobes.c           | 25 +++++++++++++++++--------

Obviously I can't comment the changes in arm/ ;)

But I'd vote for this patch.



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?

Oleg.