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| author | Huang Ying <[email protected]> | 2011-01-13 00:59:43 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2011-01-13 16:03:09 +0000 |
| commit | fb842b00c5eab66ec361b31550aa8a922745ce9e (patch) | |
| tree | cef7e6a0bd01849fcfc911f36293304f9ba7b3c2 /lib/flex_array.c | |
| parent | dca: remove unneeded NULL check (diff) | |
| download | kernel-fb842b00c5eab66ec361b31550aa8a922745ce9e.tar.gz kernel-fb842b00c5eab66ec361b31550aa8a922745ce9e.zip | |
printk: use RCU to prevent potential lock contention in kmsg_dump
dump_list_lock is used to protect dump_list in kmsg_dumper implementation,
kmsg_dump() uses it to traverse dump_list too. But if there is contention
on the lock, kmsg_dump() will fail, and the valuable kernel message may be
lost.
This patch solves this issue with RCU. Because kmsg_dump() only read the
list, no lock is needed in kmsg_dump(). So that kmsg_dump() will never
fail because of lock contention.
Signed-off-by: Huang Ying <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'lib/flex_array.c')
0 files changed, 0 insertions, 0 deletions