svn commit: r274017 - head/sys/kern

[Alfred Perlstein]

> On Nov 4, 2014, at 6:22 AM, Alfred Perlstein <bright at mu.org> wrote:
> 
> 
> 
>>> On Nov 4, 2014, at 1:25 AM, Konstantin Belousov <kostikbel at gmail.com> wrote:
>>> 
>>> On Mon, Nov 03, 2014 at 01:45:21PM -0800, Alfred Perlstein wrote:
>>> Isn't there a problem where the stack can be swapped out?
>>> 
>>> I seem to recall a problem where a swapped out process was causing 
>>> problems due to a buffer passed being stack allocated and that process 
>>> being swapped out...
>>> 
>>> If this is not the case then please disregard.
>> 
>> Sure, stack can be swapped out, but buffer passing is usually not a problem.
>> At least, I am not aware of cases.
>> 
>> In fact, many compat layers do exactly this, allocate the native-ABI
>> structure on the stack, copyin the foreighn-ABI structure in pieces
>> into the native-ABI one, and pass native to kern_foo() implementations.
>> 
>> So I think you worries are not realized.
> 
> Ok then as long as system will not pass this buffer as Dma target down to driver we are ok.  

Also thank you for explanation.