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f9411ebe3d
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>
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
#ifndef _LINUX_SCHED_RCUPDATE_WAIT_H
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#define _LINUX_SCHED_RCUPDATE_WAIT_H
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/*
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* RCU synchronization types and methods:
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*/
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#include <linux/rcupdate.h>
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#include <linux/completion.h>
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/*
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* Structure allowing asynchronous waiting on RCU.
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*/
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struct rcu_synchronize {
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struct rcu_head head;
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struct completion completion;
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};
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void wakeme_after_rcu(struct rcu_head *head);
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void __wait_rcu_gp(bool checktiny, int n, call_rcu_func_t *crcu_array,
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struct rcu_synchronize *rs_array);
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#define _wait_rcu_gp(checktiny, ...) \
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do { \
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call_rcu_func_t __crcu_array[] = { __VA_ARGS__ }; \
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struct rcu_synchronize __rs_array[ARRAY_SIZE(__crcu_array)]; \
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__wait_rcu_gp(checktiny, ARRAY_SIZE(__crcu_array), \
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__crcu_array, __rs_array); \
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} while (0)
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#define wait_rcu_gp(...) _wait_rcu_gp(false, __VA_ARGS__)
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/**
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* synchronize_rcu_mult - Wait concurrently for multiple grace periods
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* @...: List of call_rcu() functions for the flavors to wait on.
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*
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* This macro waits concurrently for multiple flavors of RCU grace periods.
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* For example, synchronize_rcu_mult(call_rcu, call_rcu_bh) would wait
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* on concurrent RCU and RCU-bh grace periods. Waiting on a give SRCU
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* domain requires you to write a wrapper function for that SRCU domain's
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* call_srcu() function, supplying the corresponding srcu_struct.
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*
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* If Tiny RCU, tell _wait_rcu_gp() not to bother waiting for RCU
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* or RCU-bh, given that anywhere synchronize_rcu_mult() can be called
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* is automatically a grace period.
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*/
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#define synchronize_rcu_mult(...) \
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_wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), __VA_ARGS__)
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#endif /* _LINUX_SCHED_RCUPDATE_WAIT_H */
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