Le Mon, Jun 10, 2024 at 06:26:21PM -0000, tip-bot2 for Oleg Nesterov a écrit :
> The following commit has been merged into the timers/urgent branch of tip:
>
> Commit-ID: 07c54cc5988f19c9642fd463c2dbdac7fc52f777
> Gitweb: https://git.kernel.org/tip/07c54cc5988f19c9642fd463c2dbdac7fc52f777
> Author: Oleg Nesterov <oleg@xxxxxxxxxx>
> AuthorDate: Tue, 28 May 2024 14:20:19 +02:00
> Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> CommitterDate: Mon, 10 Jun 2024 20:18:13 +02:00
>
> tick/nohz_full: Don't abuse smp_call_function_single() in tick_setup_device()
>
> After the recent commit 5097cbcb38e6 ("sched/isolation: Prevent boot crash
> when the boot CPU is nohz_full") the kernel no longer crashes, but there is
> another problem.
>
> In this case tick_setup_device() calls tick_take_do_timer_from_boot() to
> update tick_do_timer_cpu and this triggers the WARN_ON_ONCE(irqs_disabled)
> in smp_call_function_single().
>
> Kill tick_take_do_timer_from_boot() and just use WRITE_ONCE(), the new
> comment explains why this is safe (thanks Thomas!).
>
> Fixes: 08ae95f4fd3b ("nohz_full: Allow the boot CPU to be nohz_full")
> Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Link: https://lore.kernel.org/r/20240528122019.GA28794@xxxxxxxxxx
> Link: https://lore.kernel.org/all/20240522151742.GA10400@xxxxxxxxxx
I think we agreed on that version actually:
https://lore.kernel.org/all/20240603153557.GA8311@xxxxxxxxxx/
Thanks.
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