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authorDipankar Sarma <dipankar@in.ibm.com>2005-12-12 03:37:05 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-12 11:57:42 -0500
commitab4720ec76b756e1f8705e207a7b392b0453afd6 (patch)
tree1c4235ec8ac0e8e7f75a6f97ea6169e93647004f /include
parent85b872424984e79519be904e7df02a91ba0a9486 (diff)
[PATCH] add rcu_barrier() synchronization point
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/rcupdate.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index cce25591eec2..a471f3bb713e 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -100,6 +100,7 @@ struct rcu_data {
100 struct rcu_head *donelist; 100 struct rcu_head *donelist;
101 struct rcu_head **donetail; 101 struct rcu_head **donetail;
102 int cpu; 102 int cpu;
103 struct rcu_head barrier;
103}; 104};
104 105
105DECLARE_PER_CPU(struct rcu_data, rcu_data); 106DECLARE_PER_CPU(struct rcu_data, rcu_data);
@@ -285,6 +286,7 @@ extern void FASTCALL(call_rcu_bh(struct rcu_head *head,
285extern __deprecated_for_modules void synchronize_kernel(void); 286extern __deprecated_for_modules void synchronize_kernel(void);
286extern void synchronize_rcu(void); 287extern void synchronize_rcu(void);
287void synchronize_idle(void); 288void synchronize_idle(void);
289extern void rcu_barrier(void);
288 290
289#endif /* __KERNEL__ */ 291#endif /* __KERNEL__ */
290#endif /* __LINUX_RCUPDATE_H */ 292#endif /* __LINUX_RCUPDATE_H */