linux-kernel - Re: [PATCH] tools/sched_ext: Improve BPF verifier arena detection workaround

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Message-Id: <F3AA31BB-AC18-4CD7-B3BC-9A39CF9959B9@gmail.com>
Date: Tue, 3 Feb 2026 14:44:00 +0800
From: zhidao su <soolaugust@...il.com>
To: Emil Tsalapatis <emil@...alapatis.com>
Cc: tj@...nel.org,
 void@...ifault.com,
 arighi@...dia.com,
 changwoo@...lia.com,
 sched-ext@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/sched_ext: Improve BPF verifier arena detection
 workaround

Thanks for catching this.To be honest, this change was primarily a result of my attempt to comb through and reorganize the code logic. I mistakenly thought it was applicable here and did not perform a complete runtime test for this specific modification.I apologize for the breakage. I will revert/fix this logic in the next revision to ensure the scheduler loads correctly.

> 2026年2月3日 11:54，Emil Tsalapatis <emil@...alapatis.com> 写道：
> 
> This code change is a bit of a non-sequitur (BPF_FEATURE_ADDR_SPACE_CAST
> is unrelated to the problem scx_arena_subprog_init solves) and causes 
> the scheduler to fail to load for me. Could you please explain the logic behind 
> this patch? Does it work on your machine and if so could you let me know what
> toolchain and kernel you're using?