svn commit: r274017 - head/sys/kern
Alfred Perlstein
bright at mu.org
Tue Nov 4 14:23:41 UTC 2014
> 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.
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