linux-kernel - Re: [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64 atomic ops

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Message-ID: <aYoxSfDjUvnIIAMd@slm.duckdns.org>
Date: Mon, 9 Feb 2026 09:11:05 -1000
From: Tejun Heo <tj@...nel.org>
To: Xuewen Yan <xuewen.yan@...soc.com>
Cc: void@...ifault.com, arighi@...dia.com, changwoo@...lia.com,
	guohua.yan@...soc.com, ke.wang@...soc.com, di.shen@...soc.com,
	sched-ext@...ts.linux.dev, linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org, xuewen.yan94@...il.com
Subject: Re: [RFC PATCH] tools/sched_ext: Use u64 for kind field to fix ARM64
 atomic ops

On Mon, Feb 09, 2026 at 04:55:36PM +0800, Xuewen Yan wrote:
> From: Guohua Yan <guohua.yan@...soc.com>
> 
> There are following compile errors in arm64:
> 
> bpftools/CORE/scx_simple.bpf.c:144:2: error: unsupported atomic operation, please use 64 bit version
>   144 |         UEI_RECORD(uei, ei);
>       |         ^
> 
> Convert kind from int to u64 to resolve ARM64 atomic operation
> limitations. ARM64 primarily supports 64-bit atomic operations.

Alexei says this is llvm bpf backend error and the answer is to upgrade to a
modern llvm that defaults to -mcpu=v3.

Thanks.

-- 
tejun