linux-toradex.git/kernel/irq/Kconfig, branch v3.0.79

genirq: Make generic irq chip depend on CONFIG_GENERIC_IRQ_CHIP

2011-05-02T16:16:22+00:00

Only compile it in when there are users.

Signed-off-by: Thomas Gleixner 
Cc: linux-arm-kernel@lists.infradead.org

genirq: Remove the now obsolete config options and select statements

2011-03-30T12:13:23+00:00

Signed-off-by: Thomas Gleixner

genirq: Remove compat code

2011-03-29T12:48:19+00:00

Signed-off-by: Thomas Gleixner

genirq: Provide edge_eoi flow handler

2011-03-28T14:55:11+00:00

This is a replacment for the cell flow handler which is in the way of
cleanups. Must be selected to avoid general bloat.

Signed-off-by: Thomas Gleixner

genirq: Expand generic show_interrupts()

2011-03-25T16:04:20+00:00

Some archs want to print extra information for certain irq_chips which
is per irq and not per chip. Allow them to provide a chip callback to
print the chip name and the extra information.

PowerPC wants to print the LEVEL/EDGE type information. Make it configurable.

Signed-off-by: Thomas Gleixner

genirq: Add comments to Kconfig switches

2011-03-08T18:52:55+00:00

Signed-off-by: Thomas Gleixner 
Cc: Sam Ravnborg

genirq: Provide forced interrupt threading

2011-02-26T10:57:18+00:00

Add a commandline parameter "threadirqs" which forces all interrupts except
those marked IRQF_NO_THREAD to run threaded. That's mostly a debug option to
allow retrieving better debug data from crashing interrupt handlers. If
"threadirqs" is not enabled on the kernel command line, then there is no
impact in the interrupt hotpath.

Architecture code needs to select CONFIG_IRQ_FORCED_THREADING after
marking the interrupts which cant be threaded IRQF_NO_THREAD. All
interrupts which have IRQF_TIMER set are implict marked
IRQF_NO_THREAD. Also all PER_CPU interrupts are excluded.

Forced threading hard interrupts also forces all soft interrupt
handling into thread context.

When enabled it might slow down things a bit, but for debugging problems in
interrupt code it's a reasonable penalty as it does not immediately
crash and burn the machine when an interrupt handler is buggy.

Some test results on a Core2Duo machine:

Cache cold run of:
 # time git grep irq_desc

      non-threaded       threaded
 real 1m18.741s          1m19.061s
 user 0m1.874s           0m1.757s
 sys  0m5.843s           0m5.427s

 # iperf -c server
non-threaded
[  3]  0.0-10.0 sec  1.09 GBytes   933 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   934 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   933 Mbits/sec
threaded
[  3]  0.0-10.0 sec  1.09 GBytes   939 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   934 Mbits/sec
[  3]  0.0-10.0 sec  1.09 GBytes   937 Mbits/sec

Signed-off-by: Thomas Gleixner 
Cc: Peter Zijlstra 
LKML-Reference: <20110223234956.772668648@linutronix.de>

genirq: Streamline kernel/irq/Kconfig

2011-02-22T21:33:10+00:00

"def_bool n" without prompt is pointless, these should be just "bool".

[ tglx: Adapted to latest changes ]

Signed-off-by: Jan Beulich 
LKML-Reference: <4D5D3309020000780003264A@vpn.id2.novell.com>
Signed-off-by: Thomas Gleixner

genirq: Add preflow handler support

2011-02-19T11:58:24+00:00

sparc64 needs to call a preflow handler on certain interrupts befor
calling the action chain. Integrate it into handle_fasteoi_irq. Must
be enabled via CONFIG_IRQ_FASTEOI_PREFLOW. No impact when disabled.

Signed-off-by: Thomas Gleixner 
Cc: David S. Miller

genirq: Remove CONFIG_IRQ_PER_CPU

2011-02-19T11:58:19+00:00

The saving of this switch is minimal versus the ifdef mess it
creates. Simple enable PER_CPU unconditionally and remove the config
switch.

Signed-off-by: Thomas Gleixner