linux-kernel - [Patch 1/2] tools/memory-model: Update some warning labels

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Message-ID: <Y9GPI/g23YWx+0Ce@rowland.harvard.edu>
Date:   Wed, 25 Jan 2023 15:20:51 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Jonas Oberhauser <jonas.oberhauser@...weicloud.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Jonas Oberhauser <jonas.oberhauser@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>, will <will@...nel.org>,
        "boqun.feng" <boqun.feng@...il.com>, npiggin <npiggin@...il.com>,
        dhowells <dhowells@...hat.com>,
        "j.alglave" <j.alglave@....ac.uk>,
        "luc.maranget" <luc.maranget@...ia.fr>, akiyks <akiyks@...il.com>,
        dlustig <dlustig@...dia.com>, joel <joel@...lfernandes.org>,
        urezki <urezki@...il.com>,
        quic_neeraju <quic_neeraju@...cinc.com>,
        frederic <frederic@...nel.org>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: [Patch 1/2] tools/memory-model: Update some warning labels

Some of the warning labels used in the LKMM are unfortunately
ambiguous.  In particular, the same warning is used for both an
unmatched rcu_read_lock() call and for an unmatched rcu_read_unlock()
call.  Likewise for the srcu_* equivalents.  Also, the warning about
passing a wrong value to srcu_read_unlock() -- i.e., a value different
from the one returned by the matching srcu_read_lock() -- talks about
bad nesting rather than non-matching values.

Let's update the warning labels to make their meanings more clear.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>

---

 tools/memory-model/linux-kernel.bell |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

Index: usb-devel/tools/memory-model/linux-kernel.bell
===================================================================
--- usb-devel.orig/tools/memory-model/linux-kernel.bell
+++ usb-devel/tools/memory-model/linux-kernel.bell
@@ -53,8 +53,8 @@ let rcu-rscs = let rec
 	in matched
 
 (* Validate nesting *)
-flag ~empty Rcu-lock \ domain(rcu-rscs) as unbalanced-rcu-locking
-flag ~empty Rcu-unlock \ range(rcu-rscs) as unbalanced-rcu-locking
+flag ~empty Rcu-lock \ domain(rcu-rscs) as unmatched-rcu-lock
+flag ~empty Rcu-unlock \ range(rcu-rscs) as unmatched-rcu-unlock
 
 (* Compute matching pairs of nested Srcu-lock and Srcu-unlock *)
 let srcu-rscs = let rec
@@ -69,14 +69,14 @@ let srcu-rscs = let rec
 	in matched
 
 (* Validate nesting *)
-flag ~empty Srcu-lock \ domain(srcu-rscs) as unbalanced-srcu-locking
-flag ~empty Srcu-unlock \ range(srcu-rscs) as unbalanced-srcu-locking
+flag ~empty Srcu-lock \ domain(srcu-rscs) as unmatched-srcu-lock
+flag ~empty Srcu-unlock \ range(srcu-rscs) as unmatched-srcu-unlock
 
 (* Check for use of synchronize_srcu() inside an RCU critical section *)
 flag ~empty rcu-rscs & (po ; [Sync-srcu] ; po) as invalid-sleep
 
 (* Validate SRCU dynamic match *)
-flag ~empty different-values(srcu-rscs) as srcu-bad-nesting
+flag ~empty different-values(srcu-rscs) as srcu-bad-value-match
 
 (* Compute marked and plain memory accesses *)
 let Marked = (~M) | IW | Once | Release | Acquire | domain(rmw) | range(rmw) |