Re: [patch] KGDB for Real-Time Preemption systems

[George Anzinger <george@mvista.com>]

Serge Noiraud wrote:
> mercredi 7 Septembre 2005 23:16, George Anzinger wrote/a écrit :
>
> > Serge Noiraud wrote:
>
> ...
>
> > > I'm trying this kgdb patch with 2.6.13 and I get the following errors.
> > > Is there something I forgot ?

Where did you get the kgdb you are using?  It looks like kgdb_ts is in 
this version, but it it not in the one on my website 
http://source.mvista.com/~ganzinger/
> > This related to kgdb?  I.e. does it go away if you either turn off kgdb
> > at configure time or just don't patch with kgdb?  (It sure seems
> > unrelated, but...)
>
> I don't get those errors with CONFIG_KGDB=n
> bellow I put the diff between a working . config and a non working .config
>
> > George
> >
> >
> > > ...
> > >  INSTALL sound/usb/snd-usb-audio.ko
> > >  INSTALL sound/usb/snd-usb-lib.ko
> > >  INSTALL sound/usb/usx2y/snd-usb-usx2y.ko
> > > if [ -r System.map -a -x /sbin/depmod ]; then /sbin/depmod -ae -F
> > > System.map -b /var/tmp/kernel-2.6.13-rt4-root -r 2.6.13-rt4; fi
> > > WARNING:
>
> ...
> If I redo the make command only ( not make rpm ) I obtain the following :
> # make
>   CHK     include/linux/version.h
> make[1]: « arch/i386/kernel/asm-offsets.s » est à jour.
>   CHK     include/linux/compile.h
>   CHK     usr/initramfs_list
> Kernel: arch/i386/boot/bzImage is ready  (#1)
>   Building modules, stage 2.
>   MODPOST
> *** Warning: "preempt_locks" [net/sunrpc/sunrpc.ko] undefined!
> *** Warning: "preempt_locks" [net/appletalk/appletalk.ko] undefined!
> *** Warning: "preempt_locks" [fs/reiserfs/reiserfs.ko] undefined!
> *** Warning: "preempt_locks" [fs/ntfs/ntfs.ko] undefined!
> *** Warning: "preempt_locks" [fs/nfs/nfs.ko] undefined!
> *** Warning: "preempt_locks" [fs/minix/minix.ko] undefined!
> *** Warning: "preempt_locks" [fs/jbd/jbd.ko] undefined!
> *** Warning: "preempt_locks" [fs/ext3/ext3.ko] undefined!
> *** Warning: "preempt_locks" [fs/cifs/cifs.ko] undefined!
> *** Warning: "preempt_locks" [fs/affs/affs.ko] undefined!
> *** Warning: "preempt_locks" [drivers/scsi/libata.ko] undefined!
> *** Warning: "preempt_locks" [drivers/scsi/ide-scsi.ko] undefined!
> *** Warning: "preempt_locks" [drivers/scsi/gdth.ko] undefined!
> *** Warning: "preempt_locks" [drivers/md/raid6.ko] undefined!
> *** Warning: "preempt_locks" [drivers/md/raid5.ko] undefined!
> *** Warning: "preempt_locks" [drivers/ide/ide-floppy.ko] undefined!
> *** Warning: "preempt_locks" [drivers/block/pktcdvd.ko] undefined!
> *** Warning: "preempt_locks" [drivers/block/loop.ko] undefined!

preempt_locks is being accessed from a module but is not exported.  This 
is turned on with CONFIG_DEBUG_RT_LOCKING_MODE so change that and it 
should build.

> #
~
> -# CONFIG_EARLY_PRINTK is not set
> -# CONFIG_DEBUG_STACKOVERFLOW is not set
> +CONFIG_LATENCY_TRACE=y
> +CONFIG_RT_DEADLOCK_DETECT=y
> +CONFIG_DEBUG_RT_LOCKING_MODE=y <--------------------- This one is doing it............
> +CONFIG_DEBUG_KOBJECT=y
> +CONFIG_DEBUG_HIGHMEM=y
~
> +CONFIG_KGDB=y
> +CONFIG_KGDB_9600BAUD=y
> +# CONFIG_KGDB_19200BAUD is not set
> +# CONFIG_KGDB_38400BAUD is not set
> +# CONFIG_KGDB_57600BAUD is not set
> +# CONFIG_KGDB_115200BAUD is not set
> +CONFIG_KGDB_PORT=0x3f8
> +CONFIG_KGDB_IRQ=4
> +CONFIG_KGDB_MORE=y
> +CONFIG_KGDB_OPTIONS="-O1"
> +CONFIG_NO_KGDB_CPUS=8

The following are not in the latest kgdb...............
> +CONFIG_KGDB_TS=y
> +# CONFIG_KGDB_TS_64 is not set
> +CONFIG_KGDB_TS_128=y
> +# CONFIG_KGDB_TS_256 is not set
> +# CONFIG_KGDB_TS_512 is not set
> +# CONFIG_KGDB_TS_1024 is not set
.....................................
> +CONFIG_STACK_OVERFLOW_TEST=y
> +CONFIG_TRAP_BAD_SYSCALL_EXITS=y  <--- I recommend against this one, see notes at front of kgdb patch
> +CONFIG_KGDB_CONSOLE=y            <--- Likewise use this only if you have only one serial port and no VGA
> +CONFIG_KGDB_SYSRQ=y
>
>  #
>
> -
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--
George Anzinger   george@mvista.com
HRT (High-res-timers):  http://sourceforge.net/projects/high-res-timers/
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