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

From: Bernd Harries (bha@gmx.de)
Date: Fri Oct 05 2001 - 03:49:48 EST

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

bha@gmx.de            http://bharries.freeyellow.com
bharries@web.de       Tel. +49 421 809 7343 priv.  | MSB First!
harries@stn-atlas.de       +49 421 457 3966 offi.  | Linux-m68k
bernd@linux-m68k.org       +49 172 139 6054 handy  | Medusa T40
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This archive was generated by hypermail 2b29 : Sun Oct 07 2001 - 21:00:36 EST