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

[Tejun Heo]

On Mon, Feb 09, 2026 at 04:55:36PM +0800, Xuewen Yan wrote:
> From: Guohua Yan <guohua.yan@xxxxxxxxxx>
> 
> 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