From: Tejun Heo <tj@kernel.org>
To: Zhijian Han <hanzhijian1991@gmail.com>
Cc: David Vernet <void@manifault.com>,
Andrea Righi <arighi@nvidia.com>,
Changwoo Min <changwoo@igalia.com>,
Emil Tsalapatis <emil@etsalapatis.com>,
David Dai <david.dai@linux.dev>,
sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org,
Tejun Heo <tj@kernel.org>
Subject: [PATCH sched_ext/for-7.5] selftests/sched_ext: Fix enable_cmask load failure on older clangs
Date: Mon, 9 Nov 2026 06:26:23 -1000 [thread overview]
Message-ID: <20261109162623.674441-1-tj@kernel.org> (raw)
In-Reply-To: <6af1e5f2.a438010f.130489.ab94@mx.google.com>
enable_cmask casts the u64 arena address of the task's cmask to an __arena
pointer without cast_kern(). Older clangs without
__BPF_FEATURE_ADDR_SPACE_CAST need the explicit cast, so the test fails to
load there. Add it.
Reported-by: Zhijian Han <hanzhijian1991@gmail.com>
Closes: https://lore.kernel.org/all/6af1e5f2.a438010f.130489.ab94@mx.google.com/
Signed-off-by: Tejun Heo <tj@kernel.org>
---
Applied to sched_ext/for-7.5.
tools/testing/selftests/sched_ext/enable_cmask.bpf.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/sched_ext/enable_cmask.bpf.c b/tools/testing/selftests/sched_ext/enable_cmask.bpf.c
index 0068f3c7ab3c..081be5861424 100644
--- a/tools/testing/selftests/sched_ext/enable_cmask.bpf.c
+++ b/tools/testing/selftests/sched_ext/enable_cmask.bpf.c
@@ -104,6 +104,7 @@ void BPF_STRUCT_OPS(enable_cmask_enable, struct task_struct *p, struct scx_enabl
int ret;
asm volatile("" :: "r"(&arena));
+ cast_kern(m);
tctx = lookup_task_ctx(p);
if (!tctx)
return;
--
2.56.0
next prev parent reply other threads:[~2026-11-09 16:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-09 15:25 sched_ext selftest enable_cmask fails to load on 7.4-rc2: verifier rejects arena pointer cast from scx_enable_args.cmask_arena_addr Zhijian Han
2026-11-09 16:26 ` Tejun Heo [this message]
2026-11-09 16:32 ` [PATCH sched_ext/for-7.5] selftests/sched_ext: Fix enable_cmask load failure on older clangs sashiko-bot
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