linux-toradex.git/kernel/rcutorture.c, branch v3.12.45

rcu: Make rcutorture emit online failures if verbose

2013-08-20T18:38:45+00:00

Although rcutorture counts CPU-hotplug online failures, it does
not explicitly record which CPUs were having trouble coming online.
This commit therefore emits a console message when online failure occurs.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Remove unused variable from rcu_torture_writer()

2013-08-20T18:38:43+00:00

The oldbatch variable in rcu_torture_writer() is stored to, but never
loaded from.  This commit therefore removes it.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Sort rcutorture module parameters

2013-08-20T18:38:42+00:00

There are getting to be too many module parameters to permit the current
semi-random order, so this patch orders them.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Increase rcutorture test coverage

2013-08-20T18:38:41+00:00

Currently, rcutorture has separate torture_types to test synchronous,
asynchronous, and expedited grace-period primitives.  This has
two disadvantages: (1) Three times the number of runs to cover the
combinations and (2) Little testing of concurrent combinations of the
three options.  This commit therefore adds a pair of module parameters
that control normal and expedited state, with the default being both
types, randomly selected, by the fakewriter processes, thus reducing
source-code size and increasing test coverage.  In addtion, the writer
task switches between asynchronous-normal and expedited grace-period
primitives driven by the same pair of module parameters.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Add duplicate-callback tests to rcutorture

2013-08-20T18:37:54+00:00

This commit adds a object_debug option to rcutorture to allow the
debug-object-based checks for duplicate call_rcu() invocations to
be deterministically tested.

Signed-off-by: Paul E. McKenney 
Cc: Mathieu Desnoyers 
Cc: Sedat Dilek 
Cc: Davidlohr Bueso 
Cc: Rik van Riel 
Cc: Thomas Gleixner 
Cc: Linus Torvalds 
Tested-by: Sedat Dilek 
[ paulmck: Banish mid-function ifdef, more or less per Josh Triplett. ]
Reviewed-by: Josh Triplett 
[ paulmck: Improve duplicate-callback test, per Lai Jiangshan. ]

rcu: Add const annotation to char * for RCU tracepoints and functions

2013-07-29T21:07:49+00:00

All the RCU tracepoints and functions that reference char pointers do
so with just 'char *' even though they do not modify the contents of
the string itself. This will cause warnings if a const char * is used
in one of these functions.

The RCU tracepoints store the pointer to the string to refer back to them
when the trace output is displayed. As this can be minutes, hours or
even days later, those strings had better be constant.

This change also opens the door to allow the RCU tracepoint strings and
their addresses to be exported so that userspace tracing tools can
translate the contents of the pointers of the RCU tracepoints.

Signed-off-by: Steven Rostedt

rcu: delete __cpuinit usage from all rcu files

2013-07-14T23:36:58+00:00

The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

This removes all the drivers/rcu uses of the __cpuinit macros
from all C files.

[1] https://lkml.org/lkml/2013/5/20/589

Cc: "Paul E. McKenney" 
Cc: Josh Triplett 
Cc: Dipankar Sarma 
Reviewed-by: Josh Triplett 
Signed-off-by: Paul Gortmaker

rcu: Remove srcu_read_lock_raw() and srcu_read_unlock_raw().

2013-06-10T20:45:25+00:00

These interfaces never did get used, so this commit removes them,
their rcutorture tests, and documentation referencing them.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Lai Jiangshan 
Reviewed-by: Josh Triplett

rcu: Allow rcutorture to be built at low optimization levels

2013-02-04T20:18:20+00:00

The uses of trace_clock_local() are dead code when CONFIG_RCU_TRACE=n,
but some compilers might nevertheless generate code calling this function.
This commit therefore ensures that trace_clock_local() is invoked only
when CONFIG_RCU_TRACE=y.

Reported-by: Tetsuo Handa 
Signed-off-by: Paul E. McKenney 
Signed-off-by: Steven Rostedt

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-29T06:25:21+00:00

doctorture.2013.01.11a: Changes to rcutorture and to RCU documentation.

fixes.2013.01.26a: Miscellaneous fixes.

tagcb.2013.01.24a: Tag RCU callbacks with grace-period number to
	simplify callback advancement.

tiny.2013.01.29b: Enhancements to uniprocessor handling in tiny RCU.