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| author | Ingo Molnar <mingo@kernel.org> | 2017-02-06 11:50:49 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-03-02 10:42:24 +0300 |
| commit | f9411ebe3d85cbbea06298241e6053d031d281fc (patch) | |
| tree | 291b7e3950f83a9a6c072bb9432e3cb83dc1c65a /kernel/rcu | |
| parent | 4b53a3412d6663214ce9c754eff9373a9cff9dee (diff) | |
| download | linux-f9411ebe3d85cbbea06298241e6053d031d281fc.tar.xz | |
rcu: Separate the RCU synchronization types and APIs into <linux/rcupdate_wait.h>
So rcupdate.h is a pretty complex header, in particular it includes
<linux/completion.h> which includes <linux/wait.h> - creating a
dependency that includes <linux/wait.h> in <linux/sched.h>,
which prevents the isolation of <linux/sched.h> from the derived
<linux/wait.h> header.
Solve part of the problem by decoupling rcupdate.h from completions:
this can be done by separating out the rcu_synchronize types and APIs,
and updating their usage sites.
Since this is a mostly RCU-internal types this will not just simplify
<linux/sched.h>'s dependencies, but will make all the hundreds of
.c files that include rcupdate.h but not completions or wait.h build
faster.
( For rcutiny this means that two dependent APIs have to be uninlined,
but that shouldn't be much of a problem as they are rare variants. )
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/srcu.c | 2 | ||||
| -rw-r--r-- | kernel/rcu/tiny.c | 14 | ||||
| -rw-r--r-- | kernel/rcu/tree.c | 2 | ||||
| -rw-r--r-- | kernel/rcu/update.c | 1 |
4 files changed, 16 insertions, 3 deletions
diff --git a/kernel/rcu/srcu.c b/kernel/rcu/srcu.c index e773129c8b08..ef3bcfb15b39 100644 --- a/kernel/rcu/srcu.c +++ b/kernel/rcu/srcu.c @@ -30,7 +30,7 @@ #include <linux/mutex.h> #include <linux/percpu.h> #include <linux/preempt.h> -#include <linux/rcupdate.h> +#include <linux/rcupdate_wait.h> #include <linux/sched.h> #include <linux/smp.h> #include <linux/delay.h> diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c index fa6a48d3917b..6ad330dbbae2 100644 --- a/kernel/rcu/tiny.c +++ b/kernel/rcu/tiny.c @@ -25,7 +25,7 @@ #include <linux/completion.h> #include <linux/interrupt.h> #include <linux/notifier.h> -#include <linux/rcupdate.h> +#include <linux/rcupdate_wait.h> #include <linux/kernel.h> #include <linux/export.h> #include <linux/mutex.h> @@ -47,6 +47,18 @@ static void __call_rcu(struct rcu_head *head, #include "tiny_plugin.h" +void rcu_barrier_bh(void) +{ + wait_rcu_gp(call_rcu_bh); +} +EXPORT_SYMBOL(rcu_barrier_bh); + +void rcu_barrier_sched(void) +{ + wait_rcu_gp(call_rcu_sched); +} +EXPORT_SYMBOL(rcu_barrier_sched); + #if defined(CONFIG_DEBUG_LOCK_ALLOC) || defined(CONFIG_RCU_TRACE) /* diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index d80e0d2f68c6..cb62ce23ffc7 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -32,7 +32,7 @@ #include <linux/init.h> #include <linux/spinlock.h> #include <linux/smp.h> -#include <linux/rcupdate.h> +#include <linux/rcupdate_wait.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/nmi.h> diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 9e03db9ea9c0..a0e90e0afc75 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -49,6 +49,7 @@ #include <linux/moduleparam.h> #include <linux/kthread.h> #include <linux/tick.h> +#include <linux/rcupdate_wait.h> #define CREATE_TRACE_POINTS |