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| author | Alan Stern <stern@rowland.harvard.edu> | 2018-02-20 15:25:10 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-21 09:58:15 +0100 |
| commit | 556bb7d252ae42d4653557325670e665087c38ad (patch) | |
| tree | e57c5bd41de47f4ff5c19f406f063bda54b163fd /scripts/recordmcount.c | |
| parent | 8f7f2fbd00898deaf01e05a00095411811befd64 (diff) | |
| download | linux-556bb7d252ae42d4653557325670e665087c38ad.tar.bz2 | |
tools/memory-model: Add a S lock-based external-view litmus test
This commit adds a litmus test in which P0() and P1() form a lock-based S
litmus test, with the addition of P2(), which observes P0()'s and P1()'s
accesses with a full memory barrier but without the lock. This litmus
test asks whether writes carried out by two different processes under the
same lock will be seen in order by a third process not holding that lock.
The answer to this question is "yes" for all architectures supporting
the Linux kernel, but is "no" according to the current version of LKMM.
A patch to LKMM is under development.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akiyks@gmail.com
Cc: boqun.feng@gmail.com
Cc: dhowells@redhat.com
Cc: j.alglave@ucl.ac.uk
Cc: linux-arch@vger.kernel.org
Cc: luc.maranget@inria.fr
Cc: nborisov@suse.com
Cc: npiggin@gmail.com
Cc: parri.andrea@gmail.com
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1519169112-20593-10-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'scripts/recordmcount.c')
0 files changed, 0 insertions, 0 deletions