diff options
| author | Waiman Long <longman@redhat.com> | 2020-01-07 12:49:14 -0500 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-01-17 10:19:30 +0100 |
| commit | 57097124cbbd310cc2b5884189e22e60a3c20514 (patch) | |
| tree | dc87be64f0dda589bbc72677da67e368d8c31ba4 | |
| parent | a030f9767da1a6bbcec840fc54770eb11c2414b6 (diff) | |
| download | linux-57097124cbbd310cc2b5884189e22e60a3c20514.tar.gz linux-57097124cbbd310cc2b5884189e22e60a3c20514.tar.bz2 linux-57097124cbbd310cc2b5884189e22e60a3c20514.zip | |
locking/qspinlock: Fix inaccessible URL of MCS lock paper
It turns out that the URL of the MCS lock paper listed in the source
code is no longer accessible. I did got question about where the paper
was. This patch updates the URL to BZ 206115 which contains a copy of
the paper from
https://www.cs.rochester.edu/u/scott/papers/1991_TOCS_synch.pdf
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/20200107174914.4187-1-longman@redhat.com
| -rw-r--r-- | kernel/locking/qspinlock.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 2473f10c6956..b9515fcc9b29 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -31,14 +31,15 @@ /* * The basic principle of a queue-based spinlock can best be understood * by studying a classic queue-based spinlock implementation called the - * MCS lock. The paper below provides a good description for this kind - * of lock. + * MCS lock. A copy of the original MCS lock paper ("Algorithms for Scalable + * Synchronization on Shared-Memory Multiprocessors by Mellor-Crummey and + * Scott") is available at * - * http://www.cise.ufl.edu/tr/DOC/REP-1992-71.pdf + * https://bugzilla.kernel.org/show_bug.cgi?id=206115 * - * This queued spinlock implementation is based on the MCS lock, however to make - * it fit the 4 bytes we assume spinlock_t to be, and preserve its existing - * API, we must modify it somehow. + * This queued spinlock implementation is based on the MCS lock, however to + * make it fit the 4 bytes we assume spinlock_t to be, and preserve its + * existing API, we must modify it somehow. * * In particular; where the traditional MCS lock consists of a tail pointer * (8 bytes) and needs the next pointer (another 8 bytes) of its own node to |