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| author | Dipankar Sarma <dipankar@in.ibm.com> | 2005-12-12 00:37:05 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-12 08:57:42 -0800 |
| commit | ab4720ec76b756e1f8705e207a7b392b0453afd6 (patch) | |
| tree | 1c4235ec8ac0e8e7f75a6f97ea6169e93647004f /include/linux | |
| parent | 85b872424984e79519be904e7df02a91ba0a9486 (diff) | |
| download | blackbird-op-linux-ab4720ec76b756e1f8705e207a7b392b0453afd6.tar.gz blackbird-op-linux-ab4720ec76b756e1f8705e207a7b392b0453afd6.zip | |
[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/linux')
| -rw-r--r-- | include/linux/rcupdate.h | 2 |
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 { 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 */ |
