linux-toradex.git/drivers, branch v3.4-rc2-rt1

kconfig-disable-a-few-options-rt.patch

2012-04-10T21:41:08+00:00

Disable stuff which is known to have issues on RT

Signed-off-by: Thomas Gleixner

dm: Make rt aware

2012-04-10T21:41:04+00:00

Use the BUG_ON_NORT variant for the irq_disabled() checks. RT has
interrupts legitimately enabled here as we cant deadlock against the
irq thread due to the "sleeping spinlocks" conversion.

Reported-by: Luis Claudio R. Goncalves 
Cc: stable-rt@vger.kernel.org
Signed-off-by: Thomas Gleixner

scsi-fcoe-rt-aware.patch

2012-04-10T21:41:03+00:00

Signed-off-by: Thomas Gleixner

sysrq: Allow immediate Magic SysRq output for PREEMPT_RT_FULL

2012-04-10T21:41:03+00:00

Add a CONFIG option to allow the output from Magic SysRq to be output
immediately, even if this causes large latencies.

If PREEMPT_RT_FULL, printk() will not try to acquire the console lock
when interrupts or preemption are disabled.  If the console lock is
not acquired the printk() output will be buffered, but will not be
output immediately. Some drivers call into the Magic SysRq code
with interrupts or preemption disabled, so the output of Magic SysRq
will be buffered instead of printing immediately if this option is
not selected.

Even with this option selected, Magic SysRq output will be delayed
if the attempt to acquire the console lock fails.

Signed-off-by: Frank Rowand 
Link: http://lkml.kernel.org/r/4E7CEF60.5020508@am.sony.com
Signed-off-by: Thomas Gleixner

kgdb/serial: Short term workaround

2012-04-10T21:41:02+00:00

On 07/27/2011 04:37 PM, Thomas Gleixner wrote:
>  - KGDB (not yet disabled) is reportedly unusable on -rt right now due
>    to missing hacks in the console locking which I dropped on purpose.
>

To work around this in the short term you can use this patch, in
addition to the clocksource watchdog patch that Thomas brewed up.

Comments are welcome of course.  Ultimately the right solution is to
change separation between the console and the HW to have a polled mode
+ work queue so as not to introduce any kind of latency.

Thanks,
Jason.

ARM: at91: tclib: Default to tclib timer for RT

2012-04-10T21:41:00+00:00

RT is not too happy about the shared timer interrupt in AT91
devices. Default to tclib timer for RT.

Signed-off-by: Thomas Gleixner

rt: Improve the serial console PASS_LIMIT

2012-04-10T21:40:54+00:00

Beyond the warning:

 drivers/tty/serial/8250/8250.c:1613:6: warning: unused variable ‘pass_counter’ [-Wunused-variable]

the solution of just looping infinitely was ugly - up it to 1 million to
give it a chance to continue in some really ugly situation.

Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

drivers-tty-fix-omap-lock-crap.patch

2012-04-10T21:40:53+00:00

Signed-off-by: Thomas Gleixner

serial: 8250: Call flush_to_ldisc when the irq is threaded

2012-04-10T21:40:53+00:00

Signed-off-by: Ingo Molnar

serial: 8250: Clean up the locking for -rt

2012-04-10T21:40:53+00:00

Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner