The patch titled
Subject: percpu: add __this_cpu_try_cmpxchg()
has been added to the -mm mm-unstable branch. Its filename is
percpu-add-__this_cpu_try_cmpxchg.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/percpu-add-__this_cpu_try_cmpxchg.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Uros Bizjak <ubizjak@xxxxxxxxx>
Subject: percpu: add __this_cpu_try_cmpxchg()
Date: Tue, 28 May 2024 16:43:13 +0200
Add __this_cpu_try_cmpxchg() version of the percpu op.
Link: https://lkml.kernel.org/r/20240528144345.5980-1-ubizjak@xxxxxxxxx
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Dennis Zhou <dennis@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/percpu-defs.h | 6 ++++++
1 file changed, 6 insertions(+)
--- a/include/linux/percpu-defs.h~percpu-add-__this_cpu_try_cmpxchg
+++ a/include/linux/percpu-defs.h
@@ -475,6 +475,12 @@ do { \
raw_cpu_cmpxchg(pcp, oval, nval); \
})
+#define __this_cpu_try_cmpxchg(pcp, ovalp, nval) \
+({ \
+ __this_cpu_preempt_check("try_cmpxchg"); \
+ raw_cpu_try_cmpxchg(pcp, ovalp, nval); \
+})
+
#define __this_cpu_sub(pcp, val) __this_cpu_add(pcp, -(typeof(pcp))(val))
#define __this_cpu_inc(pcp) __this_cpu_add(pcp, 1)
#define __this_cpu_dec(pcp) __this_cpu_sub(pcp, 1)
_
Patches currently in -mm which might be from ubizjak@xxxxxxxxx are
percpu-add-__this_cpu_try_cmpxchg.patch
mm-vmalloc-use-__this_cpu_try_cmpxchg-in-preload_this_cpu_lock.patch
fork-use-this_cpu_try_cmpxchg-in-try_release_thread_stack_to_cache.patch
fork-use-this_cpu_try_cmpxchg-in-try_release_thread_stack_to_cache-fix.patch
