linux-kernel - How to get lockref patch merged?

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Date:   Tue, 3 Apr 2018 13:13:00 +0200
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Bob Peterson <rpeterso@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: How to get lockref patch merged?

Hello,

what's the best way to get the following lockref patch merged? The
maintainers file doesn't list a maintainer. Should we go straight to
Linus? Does one of you want to take it?

We have a gfs2 patch that depends on it.

Thanks,
Andreas

---------- Forwarded message ----------
From: Andreas Gruenbacher <agruenba@...hat.com>
Date: 29 March 2018 at 14:06
Subject: [PATCH v2 1/2] lockref: Add lockref_put_not_zero
To: cluster-devel@...hat.com
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, NeilBrown
<neilb@...e.com>, Thomas Graf <tgraf@...g.ch>, Herbert Xu
<herbert@...dor.apana.org.au>, Tom Herbert <tom@...ntonium.net>,
Andreas Gruenbacher <agruenba@...hat.com>


Put a lockref unless the lockref is dead or its count would become zero.
This is the same as lockref_put_or_lock except that the lock is never
left held.

Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
---
 include/linux/lockref.h |  1 +
 lib/lockref.c           | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/include/linux/lockref.h b/include/linux/lockref.h
index 2eac32095113..99f17cc8e163 100644
--- a/include/linux/lockref.h
+++ b/include/linux/lockref.h
@@ -37,6 +37,7 @@ struct lockref {
 extern void lockref_get(struct lockref *);
 extern int lockref_put_return(struct lockref *);
 extern int lockref_get_not_zero(struct lockref *);
+extern int lockref_put_not_zero(struct lockref *);
 extern int lockref_get_or_lock(struct lockref *);
 extern int lockref_put_or_lock(struct lockref *);

diff --git a/lib/lockref.c b/lib/lockref.c
index 47169ed7e964..3d468b53d4c9 100644
--- a/lib/lockref.c
+++ b/lib/lockref.c
@@ -80,6 +80,34 @@ int lockref_get_not_zero(struct lockref *lockref)
 }
 EXPORT_SYMBOL(lockref_get_not_zero);

+/**
+ * lockref_put_not_zero - Decrements count unless count <= 1 before decrement
+ * @lockref: pointer to lockref structure
+ * Return: 1 if count updated successfully or 0 if count would become zero
+ */
+int lockref_put_not_zero(struct lockref *lockref)
+{
+       int retval;
+
+       CMPXCHG_LOOP(
+               new.count--;
+               if (old.count <= 1)
+                       return 0;
+       ,
+               return 1;
+       );
+
+       spin_lock(&lockref->lock);
+       retval = 0;
+       if (lockref->count > 1) {
+               lockref->count--;
+               retval = 1;
+       }
+       spin_unlock(&lockref->lock);
+       return retval;
+}
+EXPORT_SYMBOL(lockref_put_not_zero);
+
 /**
  * lockref_get_or_lock - Increments count unless the count is 0 or dead
  * @lockref: pointer to lockref structure
--
2.14.3