linux-kernel - Re: [PATCH v3] arch/arm64: Fix topology initialization for core scheduling

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Date:   Mon,  4 Apr 2022 11:10:48 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org, Phil Auld <pauld@...hat.com>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3] arch/arm64: Fix topology initialization for core scheduling

On Thu, 31 Mar 2022 11:39:26 -0400, Phil Auld wrote:
> Arm64 systems rely on store_cpu_topology() to call update_siblings_masks()
> to transfer the toplogy to the various cpu masks. This needs to be done
> before the call to notify_cpu_starting() which tells the scheduler about
> each cpu found, otherwise the core scheduling data structures are setup
> in a way that does not match the actual topology.
> 
> With smt_mask not setup correctly we bail on `cpumask_weight(smt_mask) == 1`
> for !leaders in:
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arch/arm64: Fix topology initialization for core scheduling
      https://git.kernel.org/arm64/c/5524cbb1bfcd

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev