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[PATCH] add rcu_barrier() synchronization point

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This introduces a new interface - rcu_barrier() which waits until all
the RCUs queued until this call have been completed.

Reiser4 needs this, because we do more than just freeing memory object
in our RCU callback: we also remove it from the list hanging off
super-block.  This means, that before freeing reiser4-specific portion
of super-block (during umount) we have to wait until all pending RCU
callbacks are executed.

The only change of reiser4 made to the original patch, is exporting of
rcu_barrier().

Cc: Hans Reiser <reiser@namesys.com>
Cc: Vladimir V. Saveliev <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dipankar Sarma 2005-12-12 00:37:05 -08:00 • committed by Linus Torvalds
parent 85b8724249
commit ab4720ec76
2 changed files with 43 additions and 0 deletions
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2
include/linux/rcupdate.h
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@ -100,6 +100,7 @@ struct rcu_data {
struct rcu_head *donelist;
struct rcu_head **donetail;
int cpu;
struct rcu_head barrier;
};
DECLARE_PER_CPU(struct rcu_data, rcu_data);
@ -285,6 +286,7 @@ extern void FASTCALL(call_rcu_bh(struct rcu_head *head,
extern __deprecated_for_modules void synchronize_kernel(void);
extern void synchronize_rcu(void);
void synchronize_idle(void);
extern void rcu_barrier(void);
#endif /* __KERNEL__ */
#endif /* __LINUX_RCUPDATE_H */