From 8e74633dcefb280f2cefb49b7201d99650243d96 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 15 Aug 2021 23:29:09 +0200
Subject: futex: Remove bogus condition for requeue PI
For requeue PI it's required to establish PI state for the PI futex to
which waiters are requeued. This either acquires the user space futex on
behalf of the top most waiter on the inner 'waitqueue' futex, or attaches to
the PI state of an existing waiter, or creates on attached to the owner of
the futex.
This code can retry in case of failure, but retry can never happen when the
pi state was successfully created. The condition to run this code is:
(task_count - nr_wake) < nr_requeue
which is always true because:
task_count = 0
nr_wake = 1
nr_requeue >= 0
Remove it completely.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211305.362730187@linutronix.de
---
kernel/futex.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
(limited to 'kernel/futex.c')
diff --git a/kernel/futex.c b/kernel/futex.c
index c39d5f17946b..8ddc87cae25c 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2000,7 +2000,7 @@ retry_private:
}
}
- if (requeue_pi && (task_count - nr_wake < nr_requeue)) {
+ if (requeue_pi) {
struct task_struct *exiting = NULL;
/*
--
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