From: Pranith Kumar <bobby.prani@gmail.com>
To: Randy Dunlap <rdunlap@infradead.org>,
linux-doc@vger.kernel.org (open list:DOCUMENTATION),
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] doc: memory-barriers.txt: Correct example for reorderings
Date: Mon, 25 Aug 2014 09:08:58 -0400 [thread overview]
Message-ID: <1408972138-12246-1-git-send-email-bobby.prani@gmail.com> (raw)
Correct the example of memory orderings in memory-barriers.txt
Commit 615cc2c9cf95 "Documentation/memory-barriers.txt: fix important typo re
memory barriers" changed the assignment to x and y. Change the rest of the
example to match this change.
Reported-by: Ganesh Rapolu <ganesh.rapolu@hotmail.com>
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
---
Documentation/memory-barriers.txt | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index a4de88f..cf31875 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -121,22 +121,22 @@ For example, consider the following sequence of events:
The set of accesses as seen by the memory system in the middle can be arranged
in 24 different combinations:
- STORE A=3, STORE B=4, x=LOAD A->3, y=LOAD B->4
- STORE A=3, STORE B=4, y=LOAD B->4, x=LOAD A->3
- STORE A=3, x=LOAD A->3, STORE B=4, y=LOAD B->4
- STORE A=3, x=LOAD A->3, y=LOAD B->2, STORE B=4
- STORE A=3, y=LOAD B->2, STORE B=4, x=LOAD A->3
- STORE A=3, y=LOAD B->2, x=LOAD A->3, STORE B=4
- STORE B=4, STORE A=3, x=LOAD A->3, y=LOAD B->4
+ STORE A=3, STORE B=4, x=LOAD B->4, y=LOAD A->3
+ STORE A=3, STORE B=4, y=LOAD A->3, x=LOAD B->4
+ STORE B=4, x=LOAD B->4, STORE A=3, y=LOAD A->3
+ STORE A=3, x=LOAD B->2, y=LOAD A->3, STORE B=4
+ STORE B=4, y=LOAD A->1, STORE A=3, x=LOAD B->4
+ STORE B=4, y=LOAD A->1, x=LOAD B->4, STORE A=3
+ STORE B=4, STORE A=3, x=LOAD B->4, y=LOAD A->3
STORE B=4, ...
...
and can thus result in four different combinations of values:
- x == 1, y == 2
- x == 1, y == 4
- x == 3, y == 2
- x == 3, y == 4
+ x == 2, y == 1
+ x == 2, y == 3
+ x == 4, y == 1
+ x == 4, y == 3
Furthermore, the stores committed by a CPU to the memory system may not be
--
1.9.1
next reply other threads:[~2014-08-25 13:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-25 13:08 Pranith Kumar [this message]
[not found] ` <53FF8B77.7000103@infradead.org>
[not found] ` <20140828210010.GM5001@linux.vnet.ibm.com>
2014-08-28 21:15 ` Pranith Kumar
2014-08-28 21:39 ` Paul E. McKenney
2014-08-28 21:45 ` Pranith Kumar
2014-09-02 16:08 ` Paul E. McKenney
2014-09-03 3:30 ` Pranith Kumar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1408972138-12246-1-git-send-email-bobby.prani@gmail.com \
--to=bobby.prani@gmail.com \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rdunlap@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome