linux-kernel - [PATCH 1/2] Documentation/locking/lockdep: update info about states

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Date:   Tue, 13 Feb 2018 19:55:18 +0100
From:   Juri Lelli <juri.lelli@...hat.com>
To:     peterz@...radead.org, mingo@...hat.com, corbet@....net
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        juri.lelli@...hat.com
Subject: [PATCH 1/2] Documentation/locking/lockdep: update info about states

Commit d92a8cfcb37e ("locking/lockdep: Rework FS_RECLAIM annotation") removed
reclaim_fs lockdep STATE.

Reflect the change in documentation.

While we are at it, also clarify formula to calculate number of state
bits.

Signed-off-by: Juri Lelli <juri.lelli@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: linux-kernel@...r.kernel.org
Cc: linux-doc@...r.kernel.org
---
 Documentation/locking/lockdep-design.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/locking/lockdep-design.txt b/Documentation/locking/lockdep-design.txt
index 9de1c158d44c..e341c2f34e68 100644
--- a/Documentation/locking/lockdep-design.txt
+++ b/Documentation/locking/lockdep-design.txt
@@ -27,7 +27,8 @@ lock-class.
 State
 -----
 
-The validator tracks lock-class usage history into 4n + 1 separate state bits:
+The validator tracks lock-class usage history into 4 * nSTATEs + 1 separate
+state bits:
 
 - 'ever held in STATE context'
 - 'ever held as readlock in STATE context'
@@ -37,7 +38,6 @@ The validator tracks lock-class usage history into 4n + 1 separate state bits:
 Where STATE can be either one of (kernel/locking/lockdep_states.h)
  - hardirq
  - softirq
- - reclaim_fs
 
 - 'ever used'                                       [ == !unused        ]
 
-- 
2.14.3