Re: __get_free_pages(): is the MEM really mine?

[Bernd Harries <bha@gmx.de>]

Hi Ingo,

The problem with mmapping a Kernel buffer to userspace is still there .

It appears that __get_free_pages(GFP_KERNEL, max_order) alone is not enough to request a reliable buffer. On Monday I already sent a message to
the list which you may have overseen.

In my driver I have now the normal method on minor 26 and Roman Zippel's method on minor 27. I have used minor 27 quite heavy already and it
appears stable. Using minor 26 makes the system instable quite instantly.

I would like you to try my driver either on my system via remote login or I could try to reproduce the effect without DMA accesses to the buffer
and modify the driver so that you can try it without hardware in your Computer.

Is one of these 2 ways possible for you?

Thanks,
-- 
Bernd Harries

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