linux-toradex.git/include/linux/rcutiny.h, branch v4.14-rc3

srcu: Move rcu_scheduler_starting() from Tiny RCU to Tiny SRCU

2017-07-24T23:03:22+00:00

Other than lockdep support, Tiny RCU has no need for the
scheduler status.  However, Tiny SRCU will need this to control
boot-time behavior independent of lockdep.  Therefore, this commit
moves rcu_scheduler_starting() from kernel/rcu/tiny_plugin.h to
kernel/rcu/srcutiny.c.  This in turn allows the complete removal of
kernel/rcu/tiny_plugin.h.

Signed-off-by: Paul E. McKenney

rcu: Remove #ifdef moving rcu_end_inkernel_boot from rcupdate.h

2017-06-09T01:52:40+00:00

This commit removes a #ifdef and saves a few lines of code by moving
the rcu_end_inkernel_boot() function from include/linux/rcupdate.h to
include/linux/rcutiny.h (for TINY_RCU) and to include/linux/rcutree.h
(for TREE_RCU).

Signed-off-by: Paul E. McKenney

rcu: Refactor #includes from include/linux/rcupdate.h

2017-06-09T01:52:37+00:00

The list of #includes from include/linux/rcupdate.h has grown quite
a bit, so it is time to trim it.  This commit moves the #include
of include/linux/ktime.h to include/linux/rcutiny.h, along with the
Tiny-RCU-only function that was the only thing needing ktimem.h.  It then
reconstructs the files included into include/linux/ktime.h based on what
is actually needed, with significant help from the 0day Test Robot.

This single change reduces the .i file footprint from rcupdate.h from
9018 lines to 7101 lines.

Reported-by: Ingo Molnar 
Signed-off-by: Paul E. McKenney

rcu: Move rcutiny.h to new empty/true/false-function style

2017-06-09T01:52:34+00:00

This commit saves a few lines in include/linux/rcutiny.h by moving
to single-line definitions for empty functions, instead of the old
style where the two curly braces each get their own line.

Reported-by: Ingo Molnar 
Signed-off-by: Paul E. McKenney

rcu: Move rcu_request_urgent_qs_task() out of rcutiny.h and rcutree.h

2017-06-09T01:52:33+00:00

The rcu_request_urgent_qs_task() function is used only within RCU,
so there is no point in exporting it to the rest of the kernel from
nclude/linux/rcutiny.h and include/linux/rcutree.h.  This commit therefore
moves this function to kernel/rcu/rcu.h.

Reported-by: Ingo Molnar 
Signed-off-by: Paul E. McKenney

rcu: Move torture-related functions out of rcutiny.h and rcutree.h

2017-06-09T01:52:33+00:00

The various functions similar to rcu_batches_started(), the
function show_rcu_gp_kthreads(), the various functions similar to
rcu_force_quiescent_state(), and the variables rcutorture_testseq and
rcutorture_vernum are used only within RCU.  There is therefore no point
in exporting them to the kernel at large from include/linux/rcutiny.h
and include/linux/rcutree.h.  This commit therefore moves all of these
to kernel/rcu/rcu.h.

Reported-by: Ingo Molnar 
Signed-off-by: Paul E. McKenney

rcu: Eliminate the unused __rcu_is_watching() function

2017-06-09T01:52:30+00:00

The __rcu_is_watching() function is currently not used, aside from
to implement the rcu_is_watching() function.  This commit therefore
eliminates __rcu_is_watching(), which has the beneficial side-effect
of shrinking include/linux/rcupdate.h a bit.

Reported-by: Ingo Molnar 
Signed-off-by: Paul E. McKenney

rcu: Move torture-related definitions from rcupdate.h to rcu.h

2017-06-09T01:52:28+00:00

The include/linux/rcupdate.h file contains a number of definitions that
are used only to communicate between rcutorture, rcuperf, and the RCU code
itself.  There is no point in having these definitions exposed globally
throughout the kernel, so this commit moves them to kernel/rcu/rcu.h.
This change has the added benefit of shrinking rcupdate.h.

Reported-by: Ingo Molnar 
Signed-off-by: Paul E. McKenney

rcu: Make non-preemptive schedule be Tasks RCU quiescent state

2017-04-21T12:59:27+00:00

Currently, a call to schedule() acts as a Tasks RCU quiescent state
only if a context switch actually takes place.  However, just the
call to schedule() guarantees that the calling task has moved off of
whatever tracing trampoline that it might have been one previously.
This commit therefore plumbs schedule()'s "preempt" parameter into
rcu_note_context_switch(), which then records the Tasks RCU quiescent
state, but only if this call to schedule() was -not- due to a preemption.

To avoid adding overhead to the common-case context-switch path,
this commit hides the rcu_note_context_switch() check under an existing
non-common-case check.

Suggested-by: Steven Rostedt 
Signed-off-by: Paul E. McKenney

srcu: Allow SRCU to access rcu_scheduler_active

2017-04-18T18:38:18+00:00

This is primarily a code-movement commit in preparation for allowing
SRCU to handle early-boot SRCU grace periods.

Signed-off-by: Paul E. McKenney