linux.git/kernel/debug, branch v2.6.35-rc2

module: fix kdb's illicit use of struct module_use.

2010-06-05T01:47:36+00:00

Linus changed the structure, and luckily this didn't compile any more.

Reported-by: Stephen Rothwell 
Signed-off-by: Rusty Russell 
Cc: Jason Wessel 
Cc: Martin Hicks

x86, kgdb, init: Add early and late debug states

2010-05-21T02:04:29+00:00

The kernel debugger can operate well before mm_init(), but the x86
hardware breakpoint code which uses the perf api requires that the
kernel allocators are initialized.

This means the kernel debug core needs to provide an optional arch
specific call back to allow the initialization functions to run after
the kernel has been further initialized.

The kdb shell already had a similar restriction with an early
initialization and late initialization.  The kdb_init() was moved into
the debug core's version of the late init which is called
dbg_late_init();

CC: kgdb-bugreport@lists.sourceforge.net
Signed-off-by: Jason Wessel

kdb,debug_core: Allow the debug core to receive a panic notification

2010-05-21T02:04:28+00:00

It is highly desirable to trap into kdb on panic.  The debug core will
attempt to register as the first in line for the panic notifier.

CC: Ingo Molnar 
CC: Andrew Morton 
CC: Eric W. Biederman 
Signed-off-by: Jason Wessel

debug_core,kdb: Allow the debug core to process a recursive debug entry

2010-05-21T02:04:27+00:00

This allows kdb to debug a crash with in the kms code with a
single level recursive re-entry.

Signed-off-by: Jason Wessel

printk,kdb: capture printk() when in kdb shell

2010-05-21T02:04:27+00:00

Certain calls from the kdb shell will call out to printk(), and any of
these calls should get vectored back to the kdb_printf() so that the
kdb pager and processing can be used, as well as to properly channel
I/O to the polled I/O devices.

CC: Randy Dunlap 
Signed-off-by: Jason Wessel 
Acked-by: Andrew Morton

kgdboc,kdb: Allow kdb to work on a non open console port

2010-05-21T02:04:26+00:00

If kdb is open on a serial port that is not actually a console make
sure to call the poll routines to emit and receive characters.

Signed-off-by: Jason Wessel 
Acked-by: Martin Hicks

kgdb: Add the ability to schedule a breakpoint via a tasklet

2010-05-21T02:04:26+00:00

Some kgdb I/O modules require the ability to create a breakpoint
tasklet, such as kgdboc and external modules such as kgdboe.  The
breakpoint tasklet is used as an asynchronous entry point into the
debugger which will have a different function scope than the current
execution path where it might not be safe to have an inline
breakpoint.  This is true of some of the kgdb I/O drivers which share
code with kgdb and rest of the kernel users.

Signed-off-by: Jason Wessel

x86,kgdb: Add low level debug hook

2010-05-21T02:04:25+00:00

The only way the debugger can handle a trap in inside rcu_lock,
notify_die, or atomic_notifier_call_chain without a triple fault is
to have a low level "first opportunity handler" in the int3 exception
handler.

Generally this will be something the vast majority of folks will not
need, but for those who need it, it is added as a kernel .config
option called KGDB_LOW_LEVEL_TRAP.

CC: Ingo Molnar 
CC: Thomas Gleixner 
CC: H. Peter Anvin 
CC: x86@kernel.org
Signed-off-by: Jason Wessel

kgdb: remove post_primary_code references

2010-05-21T02:04:25+00:00

Remove all the references to the kgdb_post_primary_code.  This
function serves no useful purpose because you can obtain the same
information from the "struct kgdb_state *ks" from with in the
debugger, if for some reason you want the data.

Also remove the unintentional duplicate assignment for ks->ex_vector.

Signed-off-by: Jason Wessel

kgdboc,keyboard: Keyboard driver for kdb with kgdb

2010-05-21T02:04:24+00:00

This patch adds in the kdb PS/2 keyboard driver.  This was mostly a
direct port from the original kdb where I cleaned up the code against
checkpatch.pl and added the glue to stitch it into kgdb.

This patch also enables early kdb debug via kgdbwait and the keyboard.

All the access to configure kdb using either a serial console or the
keyboard is done via kgdboc.

If you want to use only the keyboard and want to break in early you
would add to your kernel command arguments:

    kgdboc=kbd kgdbwait

If you wanted serial and or the keyboard access you could use:

    kgdboc=kbd,ttyS0

You can also configure kgdboc as a kernel module or at run time with
the sysfs where you can activate and deactivate kgdb.

Turn it on:
    echo kbd,ttyS0 > /sys/module/kgdboc/parameters/kgdboc

Turn it off:
    echo "" > /sys/module/kgdboc/parameters/kgdboc

Signed-off-by: Jason Wessel 
Reviewed-by: Dmitry Torokhov