[PATCH v1] ARM: A9: Add ARM ERRATA 764319 workaround

[Verdun, Jean-Marie]

Hi Arnd,

>    Hi Nick,

>    This seems a bit more complex than necessary. Can't you just use a custom
>    inline asm with an ex_table entry to catch the fault? Have a look at
>    __get_user_asm() for an example.
>
>           Arnd

We got inspired from debug_reg_hook within the same source file ( ./arch/arm/kernel/hw_breakpoint.c ). We chose that path to keep coherency within the source code. We can implement the same fix by using an ex_table entry, but this will create two different ways at catching unknown instruction within the same source file. Will that be ok ?

vejmarie