[tip:locking/core] tools/memory-model: Add required herd7 version to README file

[tip-bot for Paul E. McKenney]

Commit-ID:  8f7f2fbd00898deaf01e05a00095411811befd64
Gitweb:     https://git.kernel.org/tip/8f7f2fbd00898deaf01e05a00095411811befd64
Author:     Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Tue, 20 Feb 2018 15:25:09 -0800
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 21 Feb 2018 09:58:15 +0100

tools/memory-model: Add required herd7 version to README file

LKMM and the herd7 tool are co-evolving, and out-of-date herd7 tools
produce inaccurate results, often with no obvious error messages.  This
commit therefore adds the required herd7 version to the LKMM README file.

Longer term, it would be good if .cat files could specify the required
version in a manner allowing herd7 to produce clear diagnostics.

Suggested-by: Akira Yokosawa <akiyks@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: boqun.feng@xxxxxxxxx
Cc: dhowells@xxxxxxxxxx
Cc: j.alglave@xxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: luc.maranget@xxxxxxxx
Cc: nborisov@xxxxxxxx
Cc: npiggin@xxxxxxxxx
Cc: parri.andrea@xxxxxxxxx
Cc: stern@xxxxxxxxxxxxxxxxxxx
Cc: will.deacon@xxxxxxx
Link: http://lkml.kernel.org/r/1519169112-20593-9-git-send-email-paulmck@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 tools/memory-model/README | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/memory-model/README b/tools/memory-model/README
index 91414a4..ea950c5 100644
--- a/tools/memory-model/README
+++ b/tools/memory-model/README
@@ -20,7 +20,8 @@ that litmus test to be exercised within the Linux kernel.
 REQUIREMENTS
 ============
 
-The "herd7" and "klitmus7" tools must be downloaded separately:
+Version 7.48 of the "herd7" and "klitmus7" tools must be downloaded
+separately:
 
   https://github.com/herd/herdtools7