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Date:   Wed, 6 Dec 2023 11:44:09 +0100
From:   Sebastian Siewior <bigeasy@linutronix.de>
To:     Anna-Maria Behnsen <anna-maria@linutronix.de>
Cc:     linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        John Stultz <jstultz@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Eric Dumazet <edumazet@google.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Arjan van de Ven <arjan@infradead.org>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        Frederic Weisbecker <frederic@kernel.org>,
        Rik van Riel <riel@surriel.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Giovanni Gherdovich <ggherdovich@suse.cz>,
        Lukasz Luba <lukasz.luba@arm.com>,
        "Gautham R . Shenoy" <gautham.shenoy@amd.com>,
        Srinivas Pandruvada <srinivas.pandruvada@intel.com>,
        K Prateek Nayak <kprateek.nayak@amd.com>
Subject: Re: [PATCH v9 25/32] timers: Add get next timer interrupt
 functionality for remote CPUs
Message-ID: <20231206104409.mcNIiNBs@linutronix.de>
References: <20231201092654.34614-1-anna-maria@linutronix.de>
 <20231201092654.34614-26-anna-maria@linutronix.de>
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On 2023-12-01 10:26:47 [+0100], Anna-Maria Behnsen wrote:
> To prepare for the conversion of the NOHZ timer placement to a pull at
> expiry time model it's required to have functionality available getting the
> next timer interrupt on a remote CPU.
> 
> Locking of the timer bases and getting the information for the next timer
> interrupt functionality is split into separate functions. This is required
> to be compliant with lock ordering when the new model is in place.
> 
> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
> Reviewed-by: Frederic Weisbecker <frederic@kernel.org>

Please fold the hunk below, it keeps sparse happy.

------->8---------

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 2cff43c103295..00420d8faa042 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -2075,6 +2075,8 @@ void fetch_next_timer_interrupt_remote(unsigned long basej, u64 basem,
  * Unlocks the remote timer bases.
  */
 void timer_unlock_remote_bases(unsigned int cpu)
+	__releases(timer_bases[BASE_LOCAL]->lock)
+	__releases(timer_bases[BASE_GLOBAL]->lock)
 {
 	struct timer_base *base_local, *base_global;
 
@@ -2092,6 +2094,8 @@ void timer_unlock_remote_bases(unsigned int cpu)
  * Locks the remote timer bases.
  */
 void timer_lock_remote_bases(unsigned int cpu)
+	__acquires(timer_bases[BASE_LOCAL]->lock)
+	__acquires(timer_bases[BASE_GLOBAL]->lock)
 {
 	struct timer_base *base_local, *base_global;
 

Sebastian