On 04/17/15 14:44, John Baldwin wrote:
On Friday, April 17, 2015 07:07:07 AM Hans Petter Selasky wrote:
Author: hselasky
Date: Fri Apr 17 07:07:06 2015
New Revision: 281644
URL: https://svnweb.freebsd.org/changeset/base/281644
Log:
Buffers which can be memory mapped into userspace should never be
freed. Recycle the buffers instead. This patch also fixes a panic at
reboot issue when an UDL adapter is attached to the system.
You can free them safely if you don't use malloc() / free(). Instead, you
could create an OBJT_PHYS object that you wire when you map into the kernel
and export that to userland via d_mmap_single. In your driver you just
need to unmap the kernel mapping to drop the reference count on the object.
Once the userland processes exit or remove their mappings the pages would
be freed.
Hi,
If you want to make a patch for UDL as a good example how to do this,
please go ahead! I can test the driver is not broken afterwards.
--HPS
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