Re: [PATCH 1/4] Prep for paravirt: Be careful about touching BIOS address space

On Fri, 27 Oct 2006 21:33:08 -0700
Jeremy Fitzhardinge [off-list ref] wrote:

Andrew Morton wrote:

quoted

It'd be better to use include/linux/uaccess.h:probe_kernel_address() for
this operation.
  

Ah, yes, that was the precedent I was thinking of,

We've done open-coded __get_user() in various places in the past.  The difference with
probe_kernel_address() is that it doesn't get deadlocked on mmap_sem().

 but I guess it would 
be better to just use it directly.  It's a relatively new interface, 
isn't it?

Yeah.  New enough that nobody's tried using it on non-x86 ;) It needs
to do set_fs(KERNEL_DS).