[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <ZBB1frBCnpG741ma@localhost.localdomain>
Date: Tue, 14 Mar 2023 14:24:14 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Anna-Maria Behnsen <anna-maria@...utronix.de>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
John Stultz <jstultz@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Eric Dumazet <edumazet@...gle.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Arjan van de Ven <arjan@...radead.org>,
"Paul E . McKenney" <paulmck@...nel.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH v5 16/18] timer: Implement the hierarchical pull model
Le Wed, Mar 01, 2023 at 03:17:42PM +0100, Anna-Maria Behnsen a écrit :
> diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c
> new file mode 100644
> index 000000000000..5a600de3623b
> --- /dev/null
> +++ b/kernel/time/timer_migration.c
> +static bool tmigr_active_up(struct tmigr_group *group,
> + struct tmigr_group *child,
> + void *ptr)
> +{
> + union tmigr_state curstate, newstate;
> + struct tmigr_walk *data = ptr;
> + bool walk_done;
> + u32 childmask;
> +
> + childmask = data->childmask;
> + newstate = curstate = data->groupstate;
> +
> +retry:
> + walk_done = true;
> +
> + if (newstate.migrator == TMIGR_NONE) {
> + newstate.migrator = (u8)childmask;
> +
> + /* Changes need to be propagated */
> + walk_done = false;
> + }
> +
> + newstate.active |= (u8)childmask;
> +
> + newstate.seq++;
Are you sure you need this seq counter? What bad scenario can happen without it?
Thanks.
>
Powered by blists - more mailing lists