linux/kernel/softirq.c, branch v3.16Mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
https://git.shady.money/linux/atom?h=v3.162014-05-22T09:36:10ZMerge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu2014-05-22T09:36:10ZIngo Molnarmingo@kernel.org2014-05-22T09:36:10Zurn:sha1:e14505a8d50882ff3bdd4b791b14d90a0881fa4d
Pull RCU updates from Paul E. McKenney:
" 1. Update RCU documentation. These were posted to LKML at
https://lkml.org/lkml/2014/4/28/634.
2. Miscellaneous fixes. These were posted to LKML at
https://lkml.org/lkml/2014/4/28/645.
3. Torture-test changes. These were posted to LKML at
https://lkml.org/lkml/2014/4/28/667.
4. Variable-name renaming cleanup, sent separately due to conflicts.
This was posted to LKML at https://lkml.org/lkml/2014/5/13/854.
5. Patch to suppress RCU stall warnings while sysrq requests are
being processed. This patch is the RCU portions of the patch
that Rik posted to LKML at https://lkml.org/lkml/2014/4/29/457.
The reason for pushing this patch ahead instead of waiting until
3.17 is that the NMI-based stack traces are messing up sysrq
output, and in some cases also messing up the system as well."
Signed-off-by: Ingo Molnar <mingo@kernel.org>
asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/*2014-05-05T23:07:46ZAndi Kleenak@linux.intel.com2014-05-01T22:44:38Zurn:sha1:722a9f9299ca720a3f14660e7c0dce7b76a9cb42
As requested by Linus add explicit __visible to the asmlinkage users.
This marks functions visible to assembler.
Tree sweep for rest of tree.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1398984278-29319-4-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
softirq: A single rcu_bh_qs() call per softirq set is enough2014-04-29T15:45:40ZEric Dumazetedumazet@google.com2014-04-16T16:06:24Zurn:sha1:a5d6d3a1b00a0ad88f07c3a727c79b27915278e3
Calling rcu_bh_qs() after every softirq action is not really needed.
What RCU needs is at least one rcu_bh_qs() per softirq round to note a
quiescent state was passed for rcu_bh.
Note for Paul and myself : this could be inlined as a single instruction
and avoid smp_processor_id()
(sone this_cpu_write(rcu_bh_data.passed_quiesce, 1))
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
genirq: x86: Ensure that dynamic irq allocation does not conflict2014-04-28T10:20:00ZThomas Gleixnertglx@linutronix.de2014-04-24T07:50:53Zurn:sha1:62a08ae2a5763aabeee98264605236b001503e0c
On x86 the allocation of irq descriptors may allocate interrupts which
are in the range of the GSI interrupts. That's wrong as those
interrupts are hardwired and we don't have the irq domain translation
like PPC. So one of these interrupts can be hooked up later to one of
the devices which are hard wired to it and the io_apic init code for
that particular interrupt line happily reuses that descriptor with a
completely different configuration so hell breaks lose.
Inside x86 we allocate dynamic interrupts from above nr_gsi_irqs,
except for a few usage sites which have not yet blown up in our face
for whatever reason. But for drivers which need an irq range, like the
GPIO drivers, we have no limit in place and we don't want to expose
such a detail to a driver.
To cure this introduce a function which an architecture can implement
to impose a lower bound on the dynamic interrupt allocations.
Implement it for x86 and set the lower bound to nr_gsi_irqs, which is
the end of the hardwired interrupt space, so all dynamic allocations
happen above.
That not only allows the GPIO driver to work sanely, it also protects
the bogus callsites of create_irq_nr() in hpet, uv, irq_remapping and
htirq code. They need to be cleaned up as well, but that's a separate
issue.
Reported-by: Jin Yao <yao.jin@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: H. Peter Anvin <hpa@linux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Krogerus Heikki <heikki.krogerus@intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1404241617360.28206@ionos.tec.linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
softirq: Add linux/irq.h to make it compile again2014-03-19T10:28:14ZThomas Gleixnertglx@linutronix.de2014-03-19T10:19:52Zurn:sha1:d532676cc7329e1088702ccb0015942cc370b954
On Sparc and S390 the removal of irq.h from kernel_stat.h causes:
kernel/softirq.c:774:9: error: 'NR_IRQS_LEGACY' undeclared
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip2014-01-31T17:02:51ZLinus Torvaldstorvalds@linux-foundation.org2014-01-31T17:02:51Zurn:sha1:aafd9d6a46745926648cb5d0b68b108e79ceb8d4
Pull timer/dynticks updates from Ingo Molnar:
"This tree contains misc dynticks updates: a fix and three cleanups"
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/nohz: Fix overflow error in scheduler_tick_max_deferment()
nohz_full: fix code style issue of tick_nohz_full_stop_tick
nohz: Get timekeeping max deferment outside jiffies_lock
tick: Rename tick_check_idle() to tick_irq_enter()
softirq: use const char * const for softirq_to_name, whitespace neatening2014-01-28T05:02:40ZJoe Perchesjoe@perches.com2014-01-28T01:07:16Zurn:sha1:ce85b4f2eab663dfd4ff2cb5b603ba03f595922e
Reduce data size a little.
Reduce checkpatch noise.
$ size kernel/softirq.o*
text data bss dec hex filename
11554 6013 4008 21575 5447 kernel/softirq.o.new
11474 6093 4008 21575 5447 kernel/softirq.o.old
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
softirq: convert printks to pr_<level>2014-01-28T05:02:40ZJoe Perchesjoe@perches.com2014-01-28T01:07:15Zurn:sha1:403227641533c4227d44d14f25c8f3676f6e7436
Use a more current logging style.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
softirq: use ffs() in __do_softirq()2014-01-28T05:02:40ZJoe Perchesjoe@perches.com2014-01-28T01:07:14Zurn:sha1:2e702b9f6cba4eb87d90e2a2d425a1fc05eec803
Possible speed improvement of __do_softirq() by using ffs() instead of
using a while loop with an & 1 test then single bit shift.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Merge branch 'timers/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into timers/urgent2014-01-25T07:27:26ZIngo Molnarmingo@kernel.org2014-01-25T07:27:26Zurn:sha1:a2b4c607c93a0850c8e3d90688cf3bd08576b986
Pull dynticks cleanups from Frederic Weisbecker.
Signed-off-by: Ingo Molnar <mingo@kernel.org>