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authorWaiman Long <longman@redhat.com>2020-01-07 18:49:14 +0100
committerPeter Zijlstra <peterz@infradead.org>2020-01-17 10:19:30 +0100
commit57097124cbbd310cc2b5884189e22e60a3c20514 (patch)
treedc87be64f0dda589bbc72677da67e368d8c31ba4 /kernel/locking
parentlocking/lockdep: Fix lockdep_stats indentation problem (diff)
downloadlinux-57097124cbbd310cc2b5884189e22e60a3c20514.tar.xz
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
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/qspinlock.c13
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