linux-kernel - [tip:locking/core] Documentation/locking/lockdep: Update info about states

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Date:   Wed, 14 Feb 2018 03:04:11 -0800
From:   tip-bot for Juri Lelli <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, torvalds@...ux-foundation.org,
        tglx@...utronix.de, corbet@....net, mingo@...nel.org,
        juri.lelli@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:locking/core] Documentation/locking/lockdep: Update info about
 states

Commit-ID:  e5684bbfc3f03480d6ba2150f133630fb510d3eb
Gitweb:     https://git.kernel.org/tip/e5684bbfc3f03480d6ba2150f133630fb510d3eb
Author:     Juri Lelli <juri.lelli@...hat.com>
AuthorDate: Tue, 13 Feb 2018 19:55:18 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 14 Feb 2018 12:01:22 +0100

Documentation/locking/lockdep: Update info about states

Commit:

  d92a8cfcb37e ("locking/lockdep: Rework FS_RECLAIM annotation")

removed the 'reclaim_fs' lockdep STATE.

Reflect the change in the documentation.

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

Signed-off-by: Juri Lelli <juri.lelli@...hat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Jonathan Corbet <corbet@....net>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-doc@...r.kernel.org
Link: http://lkml.kernel.org/r/20180213185519.18186-2-juri.lelli@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.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 9de1c15..e341c2f 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        ]