The quilt patch titled
Subject: refcount: introduce __refcount_{add|inc}_not_zero_limited_acquire
has been removed from the -mm tree. Its filename was
refcount-introduce-__refcount_addinc_not_zero_limited_acquire.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: refcount: introduce __refcount_{add|inc}_not_zero_limited_acquire
Date: Thu, 13 Feb 2025 14:46:48 -0800
Introduce functions to increase refcount but with a top limit above which
they will fail to increase (the limit is inclusive). Setting the limit to
INT_MAX indicates no limit.
Link: https://lkml.kernel.org/r/20250213224655.1680278-12-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Tested-by: Shivank Garg <shivankg@xxxxxxx>
Link: https://lkml.kernel.org/r/5e19ec93-8307-47c2-bb13-3ddf7150624e@xxxxxxx
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Klara Modin <klarasmodin@xxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Lokesh Gidra <lokeshgidra@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: Mateusz Guzik <mjguzik@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: "Paul E . McKenney" <paulmck@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Shakeel Butt <shakeel.butt@xxxxxxxxx>
Cc: Sourav Panda <souravpanda@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/refcount.h | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
--- a/include/linux/refcount.h~refcount-introduce-__refcount_addinc_not_zero_limited_acquire
+++ a/include/linux/refcount.h
@@ -213,13 +213,20 @@ static inline __must_check bool refcount
}
static inline __must_check __signed_wrap
-bool __refcount_add_not_zero_acquire(int i, refcount_t *r, int *oldp)
+bool __refcount_add_not_zero_limited_acquire(int i, refcount_t *r, int *oldp,
+ int limit)
{
int old = refcount_read(r);
do {
if (!old)
break;
+
+ if (i > limit - old) {
+ if (oldp)
+ *oldp = old;
+ return false;
+ }
} while (!atomic_try_cmpxchg_acquire(&r->refs, &old, old + i));
if (oldp)
@@ -231,6 +238,18 @@ bool __refcount_add_not_zero_acquire(int
return old;
}
+static inline __must_check bool
+__refcount_inc_not_zero_limited_acquire(refcount_t *r, int *oldp, int limit)
+{
+ return __refcount_add_not_zero_limited_acquire(1, r, oldp, limit);
+}
+
+static inline __must_check __signed_wrap
+bool __refcount_add_not_zero_acquire(int i, refcount_t *r, int *oldp)
+{
+ return __refcount_add_not_zero_limited_acquire(i, r, oldp, INT_MAX);
+}
+
/**
* refcount_add_not_zero_acquire - add a value to a refcount with acquire ordering unless it is 0
*
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
