From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 16C3048B37B; Wed, 12 Aug 2026 21:16:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786569372; cv=none; b=YJidSSijya78YutHg8/Zhb9U2UVwofEGOAvaw287ZUZbh3180yYosy/taJPd+Z+00HghngZwXEneTyE8vEHl2xW69PBUuNP0pXDSoIoOUswYJ5h7TJN4H2kgCP+nW+4pIPiADHKD+inSMcKMfwt/fQnat22RmwpDErXvFXNd06c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786569372; c=relaxed/simple; bh=kIiDjeUyuDCDIo8wNx8KlcklbrmyKNxcUVGdsy8DsxA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=lp+Q1ibsmindbVYES4Hv6VqYA4wV9aYpV8Sdtqm5wzlkD/PwQ6gqr9F6dZldU8emJpglsyjsii1mQGW3uEqQwc7vfmHZvwAPw6ID1ZGYjnPXkWU/zHOIJDl3USSC4UsM0TcQvQS57oio8kUt7BGp58Xm5jApjLMF5djJYtdLSFo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=eKAycrNj; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="eKAycrNj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 819CB1F000E9; Wed, 12 Aug 2026 21:16:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786569370; bh=RpQhdg/QTxLp/9eazlCeybHpEsxG6eRjpDGXxMBgH/4=; h=From:To:Cc:Subject:Date; b=eKAycrNj97jCjHNJFyNjUl29iEftsBGq7fFv8UFpgDmvxf/BJr1iSQkbK1AukXMrn envM7CxEW3kyz7D9LnWggB6AyMp5qB6SlJIYc+1nAhfpHfwV3kv4k/DSNMeZnGtmln +fc2t/lusZ35+HcVWYgzM0q06ph5GmqyhyXEj6BJkBrGOWOw9SX3mmH+URUkiZG/GW tswO2dEDSwBDEtkogUYg34s6Gohezny0KPcsRIYhcpEZUtChGzdZWoZ2O0JKyjePVz rJ4l3oValiRpUqtEtHFBMJAyPm3LnZwlXEB8Mv2Tj1jXKQKBFljTSVI7kXELOJAjaD A8nZ8S1sBiHoA== From: Tejun Heo To: David Vernet , Andrea Righi , Changwoo Min Cc: Kumar Kartikeya Dwivedi , sched-ext@lists.linux.dev, Emil Tsalapatis , linux-kernel@vger.kernel.org Subject: [PATCHSET sched_ext/for-7.3-arena-args] sched_ext: Convert arena-pointer interfaces to __arena arguments Date: Wed, 12 Aug 2026 11:16:06 -1000 Message-ID: <20260812211609.2495583-1-tj@kernel.org> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit cid-form schedulers keep their data in the BPF arena, but the interfaces that pass arena objects between the kernel and BPF predate the __arena argument support that just landed in bpf-next: kfuncs took the pointers as __ign scalars or verifier-checked buffers, and both sides rebased between the address forms by hand. Convert all of them to __arena arguments before cid-form schedulers start seeing real use. The ops_cid set_cmask() and sub_caps_updated() callbacks pass kernel arena addresses that the struct_ops trampoline converts, the sub-cap kfuncs and scx_bpf_cid_override() receive rebased kernel pointers directly, and the hand-rolled conversion helpers are removed. The BPF-side declarations carry __arena-qualified pointers, so scx_qmap passes its arena objects without casts. The arena argument address translation is currently implemented only on x86-64. cid-form schedulers using these interfaces load only there for now. This patchset contains the following three patches: 0001-sched_ext-Pass-kernel-arena-pointers-to-ops_cid-call.patch 0002-sched_ext-Convert-sub-cap-kfuncs-to-__arena-cmask-ar.patch 0003-sched_ext-Convert-scx_bpf_cid_override-to-__arena-ar.patch and is based on sched_ext/for-7.3-arena-args (294d95ff251b), which is for-7.3 with bpf-next d114bb989367 ("Merge branch 'add-arena-argument-support-to-kfuncs-and-struct_ops'") pulled in for the __arena argument support. The patches are also available in the following git branch: git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git arena-args diffstat follows. kernel/sched/ext/arena.c | 3 +- kernel/sched/ext/cid.c | 60 +++++++++++++++------------- kernel/sched/ext/ext.c | 22 +++++------ kernel/sched/ext/internal.h | 19 ++------- kernel/sched/ext/sub.c | 53 ++++++++++++------------- kernel/sched/ext/types.h | 6 +-- tools/sched_ext/include/scx/common.bpf.h | 11 +++--- tools/sched_ext/include/scx/compat.bpf.h | 14 ++++--- tools/sched_ext/scx_qmap.bpf.c | 36 ++++++----------- tools/sched_ext/scx_qmap.c | 68 +++++++++++++++++++------------- tools/sched_ext/scx_qmap.h | 4 ++ 11 files changed, 148 insertions(+), 148 deletions(-) -- tejun