Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on... | linux-arch

[PATCH v11 00/16] Add support for 32-bit tasks on asymmetric AArch32 systems · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 01/16] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 02/16] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 03/16] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 04/16] cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 05/16] sched: Reject CPU affinity changes based on task_cpu_possible_mask() · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 06/16] sched: Introduce task_struct::user_cpus_ptr to track requested affinity · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 07/16] sched: Split the guts of sched_setaffinity() into a helper function · Will Deacon <will@kernel.org> · 2021-07-30
Re: [PATCH v11 07/16] sched: Split the guts of sched_setaffinity() into a helper function · Peter Zijlstra <peterz@infradead.org> · 2021-08-17
Re: [PATCH v11 07/16] sched: Split the guts of sched_setaffinity() into a helper function · Will Deacon <will@kernel.org> · 2021-08-18
Re: [PATCH v11 07/16] sched: Split the guts of sched_setaffinity() into a helper function · Peter Zijlstra <peterz@infradead.org> · 2021-08-18
Re: [PATCH v11 07/16] sched: Split the guts of sched_setaffinity() into a helper function · Will Deacon <will@kernel.org> · 2021-08-18
[PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Will Deacon <will@kernel.org> · 2021-07-30
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Peter Zijlstra <peterz@infradead.org> · 2021-08-17
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Will Deacon <will@kernel.org> · 2021-08-18
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Peter Zijlstra <peterz@infradead.org> · 2021-08-18
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Peter Zijlstra <peterz@infradead.org> · 2021-08-18
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Will Deacon <will@kernel.org> · 2021-08-18
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Peter Zijlstra <peterz@infradead.org> · 2021-08-18
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Peter Zijlstra <peterz@infradead.org> · 2021-08-17
Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems · Will Deacon <will@kernel.org> · 2021-08-18
[PATCH v11 09/16] sched: Introduce dl_task_check_affinity() to check proposed affinity · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 10/16] arm64: Implement task_cpu_possible_mask() · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 11/16] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 12/16] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 13/16] arm64: Advertise CPUs capable of running 32-bit applications in sysfs · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 14/16] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 15/16] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores · Will Deacon <will@kernel.org> · 2021-07-30
[PATCH v11 16/16] Documentation: arm64: describe asymmetric 32-bit support · Will Deacon <will@kernel.org> · 2021-07-30

Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems

From: Peter Zijlstra <peterz@infradead.org>
Date: 2021-08-18 11:08:38
Also in: linux-arm-kernel, lkml

On Wed, Aug 18, 2021 at 11:42:28AM +0100, Will Deacon wrote:

Ah, sorry. I didn't realise you couldn't _free_ with a raw lock held in RT.
Is there somewhere I can read up on that?

It's because the allocators use spinlock_t, which cannot nest inside
raw_spinlock_t.

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