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Message-Id: <20200313031017.71090-1-ling.ma.program@gmail.com> Date: Fri, 13 Mar 2020 11:10:17 +0800 From: ling.ma.program@...il.com To: linux-kernel@...r.kernel.org Cc: ling.ml@...fin.com Subject: [RFC PATCH] locks:Remove spinlock in unshare_files From: Ma Ling <ling.ml@...fin.com> Processor support atomic operation for long/int/short/char type, we use the feature to avoid spinlock, which cost hundreds cycles. Appreciate your comments Ling Signed-off-by: Ma Ling <ling.ml@...fin.com> --- kernel/fork.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index 60a1295..fe54600 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -3041,9 +3041,7 @@ int unshare_files(struct files_struct **displaced) return error; } *displaced = task->files; - task_lock(task); - task->files = copy; - task_unlock(task); + WRITE_ONCE(task->files, copy); return 0; } -- 1.8.3.1
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