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Re: Kernel crash on device_map DEVICE_NULL
From: |
John Tobey |
Subject: |
Re: Kernel crash on device_map DEVICE_NULL |
Date: |
Fri, 23 Nov 2001 00:02:35 -0500 |
User-agent: |
Mutt/1.2.5i |
On Thu, Nov 22, 2001 at 01:51:12PM -0500, Roland McGrath wrote:
> There is no meaningful sense in which ext2fs.static can "call device_map on
> a null pointer". device_map is an RPC. The only way a user task "calls"
> the kernel function is by sending an RPC. The RPC should never have gotten
> there without a valid receiver port, so I don't see how it's possible.
Good point. I will have to figure this out. The port is not null, of
course, but dev_port_lookup() is returning null because its kotype is
IKOT_TASK and not IKOT_DEVICE: no doubt a bug in my code.
There sure are a lot of #ifdef i386 sections in dev_lookup.c and
ds_routines.c, and they don't seem to have anything to do with the
i386 architecture. They seem to select whether devices use the
dispatch table defined in i386/i386at/device_emul.h. I wonder if
there is any good reason that device_emul.h is under the i386 branch
and whether the test macro should be MACH_DEVICE_EMUL instead of i386
(and set -DMACH_DEVICE_EMUL in i386/Makefrag). For OTOP, I am
inserting
#if OTOP
#undef i386
#endif
in those two files. (Hmmm, I'm not sure if I need -Di386 *anywhere*
anymore.) Perhaps I should instead copy device_emul.h into otop and
use the virtual table. I will look in ChangeLog for clues.
Thanks.
-John
- Hurd on Mach on GNU/Linux (verion 0.0.0), John Tobey, 2001/11/18
- Re: Hurd on Mach on GNU/Linux (verion 0.0.0), Roland McGrath, 2001/11/18
- Re: Hurd on Mach on GNU/Linux (verion 0.0.0), John Tobey, 2001/11/18
- Kernel crash on device_map DEVICE_NULL, John Tobey, 2001/11/22
- Re: Kernel crash on device_map DEVICE_NULL, Roland McGrath, 2001/11/23
- Re: Kernel crash on device_map DEVICE_NULL, John Tobey, 2001/11/24
- Re: Kernel crash on device_map DEVICE_NULL, Roland McGrath, 2001/11/24
- cruft and forks, John Tobey, 2001/11/24
- Re: cruft and forks, Marcus Brinkmann, 2001/11/25
- Re: cruft and forks, John Tobey, 2001/11/25
Re: Hurd on Mach on GNU/Linux (verion 0.0.0), Farid Hajji, 2001/11/19