From: Johannes Berg <johannes@sipsolutions.net>
To: Tiwei Bie <tiwei.bie@linux.dev>,
richard@nod.at, anton.ivanov@cambridgegreys.com
Cc: linux-um@lists.infradead.org, linux-kernel@vger.kernel.org,
benjamin@sipsolutions.net, arnd@arndb.de,
tiwei.btw@antgroup.com
Subject: Re: [PATCH v2 05/10] um: Determine sleep based on need_resched()
Date: Thu, 11 Sep 2025 11:27:04 +0200 [thread overview]
Message-ID: <78c8e39d9719a26c6e492e895b070794eb8218ea.camel@sipsolutions.net> (raw)
In-Reply-To: <20250810055136.897712-6-tiwei.bie@linux.dev> (sfid-20250810_075306_773702_0F58F2CF)
On Sun, 2025-08-10 at 13:51 +0800, Tiwei Bie wrote:
>
> void um_idle_sleep(void)
> {
> - if (time_travel_mode != TT_MODE_OFF)
> + if (time_travel_mode != TT_MODE_OFF) {
> time_travel_sleep();
> - else
> + } else {
> + raw_local_irq_enable();
> os_idle_sleep();
> + raw_local_irq_disable();
> + }
This seems wrong, with it, lockdep gets really unhappy, and if I remove
this change it seems to work OK?
I'll note that arch_cpu_idle() for x86 also doesn't change anything with
interrupts.
Was there something else that required this change that I'm missing?
johannes
next prev parent reply other threads:[~2025-09-11 9:27 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-10 5:51 [PATCH v2 00/10] um: Add SMP support Tiwei Bie
2025-08-10 5:51 ` [PATCH v2 01/10] um: Stop tracking virtual CPUs via mm_cpumask() Tiwei Bie
2025-08-10 5:51 ` [PATCH v2 02/10] um: Remove unused cpu_data and current_cpu_data macros Tiwei Bie
2025-08-10 5:51 ` [PATCH v2 03/10] um: vdso: Implement __vdso_getcpu() via syscall Tiwei Bie
2025-09-10 11:59 ` Johannes Berg
2025-09-11 4:29 ` Tiwei Bie
2025-09-21 20:00 ` Thomas Weißschuh
2025-09-22 4:50 ` Tiwei Bie
2025-09-22 12:05 ` Thomas Weißschuh
2025-09-22 12:12 ` Johannes Berg
2025-09-22 14:01 ` Thomas Weißschuh
2025-09-22 15:14 ` Johannes Berg
2025-09-22 16:04 ` Thomas Weißschuh
2025-09-22 17:07 ` Johannes Berg
2025-09-25 17:08 ` Thomas Weißschuh
2025-08-10 5:51 ` [PATCH v2 04/10] um: Turn signals_* into thread-local variables Tiwei Bie
2025-09-10 12:15 ` Johannes Berg
2025-09-11 4:34 ` Tiwei Bie
2025-09-11 7:37 ` Benjamin Berg
2025-09-11 8:06 ` Benjamin Berg
2025-09-12 0:30 ` Tiwei Bie
2025-09-12 7:58 ` Benjamin Berg
2025-09-12 13:27 ` Tiwei Bie
2025-09-11 9:44 ` Johannes Berg
2025-09-11 10:35 ` Benjamin Berg
2025-08-10 5:51 ` [PATCH v2 05/10] um: Determine sleep based on need_resched() Tiwei Bie
2025-09-10 12:10 ` Johannes Berg
2025-09-11 4:39 ` Tiwei Bie
2025-09-11 6:59 ` Johannes Berg
2025-09-12 0:59 ` Tiwei Bie
2025-09-11 9:27 ` Johannes Berg [this message]
2025-09-12 0:54 ` Tiwei Bie
2025-08-10 5:51 ` [PATCH v2 06/10] um: Define timers on a per-CPU basis Tiwei Bie
2025-08-10 9:49 ` kernel test robot
2025-08-10 5:51 ` [PATCH v2 07/10] um: Remove unused ipi_pipe field from cpuinfo_um Tiwei Bie
2025-08-10 5:51 ` [PATCH v2 08/10] um: Add initial SMP support Tiwei Bie
2025-09-11 9:32 ` Johannes Berg
2025-09-12 0:45 ` Tiwei Bie
2025-09-12 7:58 ` Johannes Berg
2025-08-10 5:51 ` [PATCH v2 09/10] asm-generic: percpu: Add assembly guard Tiwei Bie
2025-09-10 12:12 ` Johannes Berg
2025-08-10 5:51 ` [PATCH v2 10/10] um: Enable SMP support on x86 Tiwei Bie
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