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| author | Tom Zanussi <zanussi@us.ibm.com> | 2005-12-20 20:10:22 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-21 02:33:22 +0100 |
| commit | fd30fc3256824f03c2ff9317269d66f72f7042ca (patch) | |
| tree | 863a1ba4ddae961e2727343c17d15f64c3f4d463 /include | |
| parent | [PATCH] fix spinlock-debugging smp_processor_id() usage (diff) | |
| download | linux-fd30fc3256824f03c2ff9317269d66f72f7042ca.tar.xz linux-fd30fc3256824f03c2ff9317269d66f72f7042ca.zip | |
[PATCH] relayfs: remove warning printk() in relay_switch_subbuf()
There's currently a diagnostic printk in relay_switch_subbuf() meant as
a warning if you accidentally try to log an event larger than the
sub-buffer size.
The problem is if this happens while logging from somewhere it's not
safe to be doing printks, such as in the scheduler, you can end up with
a deadlock. This patch removes the warning from relay_switch_subbuf()
and instead prints some diagnostic info when the channel is closed.
Thanks to Mathieu Desnoyers for pointing out the problem and
suggesting a fix.
Signed-off-by: Tom Zanussi <zanussi@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/relayfs_fs.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/relayfs_fs.h b/include/linux/relayfs_fs.h index cfafc3e76bc2..fb7e80737325 100644 --- a/include/linux/relayfs_fs.h +++ b/include/linux/relayfs_fs.h @@ -20,9 +20,9 @@ #include <linux/kref.h> /* - * Tracks changes to rchan_buf struct + * Tracks changes to rchan/rchan_buf structs */ -#define RELAYFS_CHANNEL_VERSION 5 +#define RELAYFS_CHANNEL_VERSION 6 /* * Per-cpu relay channel buffer @@ -60,6 +60,7 @@ struct rchan struct rchan_callbacks *cb; /* client callbacks */ struct kref kref; /* channel refcount */ void *private_data; /* for user-defined data */ + size_t last_toobig; /* tried to log event > subbuf size */ struct rchan_buf *buf[NR_CPUS]; /* per-cpu channel buffers */ }; |