From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 267DC3CC9E9; Mon, 9 Mar 2026 16:44:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773074698; cv=none; b=LF8pYch/opDOJWUZKhImm+6yZyMdGBeRIu3zVOXOfZWIuDtI3HUBlu8/4smIGQAthydRy8PqooRzRi1oQuwqNKInTbzj18/v7wFXzYspcLFhtpzbxD4N+e3CbIwPDN/EdquyJ6DC7wdJW21p5EBo9KKD1MvVJQCzdvZt1jbQIf4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773074698; c=relaxed/simple; bh=RrWSWkbnyaPLrtYTEafjeh+wWEqYTVgF7BWWWC+jaaw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=o9F29MGQDfeCotup15UJg5YkBqSsJjkY3x8j2ASr753+5P/htuIj66eAavsH1NNQT1vICk582NdWqc7UiUWrR4P4hGGw/ofWCcRdfXesZey9bLYKydiwcUIYyzH6aZ1qFcPyxHcCyNuWrV6+3dY/0fQ4yemqDCalRcKGOr+gYsw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YoPEIp1C; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YoPEIp1C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE2DDC4CEF7; Mon, 9 Mar 2026 16:44:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773074697; bh=RrWSWkbnyaPLrtYTEafjeh+wWEqYTVgF7BWWWC+jaaw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YoPEIp1C4VBYQxiVV9rtX/3ex3Pbrnv95wdeQM2FUTvc2MTTKza9A4OMPTurKiKxX LntyPoy0kAUSPG6Ait6PLbQdZEMFH3I65RUVJCXdiDOkFNRZOLnBkXAEO8SnSnA8A1 ORWm53h5sbzeCsDOysc3d1WTucGVv0Qu5GVkQLzu2TN50nyI+Qy5u5ibQoa2Eman/J 3SxeBVfFxJSskRtVjQu7NtkuTUhXiMMQYLK6HTjA0tb3kW36NN/biQiXGRlJ2jgyZN Hv1CRVWoVoSZPI63Se8g7vluP+ZcFgyXBMC1AMj39y2+JTu6vPrpVZ4NCxsjmD2EOL vAktRTgDiYhJg== Date: Mon, 9 Mar 2026 06:44:56 -1000 From: Tejun Heo To: Emil Tsalapatis Cc: Zhao Mengmeng , void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, llvm@lists.linux.dev, zhaomengmeng@kylinos.cn Subject: Re: [PATCH v2 2/2] tools/sched_ext: scx_sdt: Fix BPF verifier rejection on older LLVMs Message-ID: References: <20260309022847.106150-1-zhaomzhao@126.com> <20260309022847.106150-3-zhaomzhao@126.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Mar 09, 2026 at 12:36:40PM -0400, Emil Tsalapatis wrote: > On the other hand, maybe the extra compatibility is worth re-adding > cast_kern/cast_user to the code. I am slightly in favor of keeping it > as-is to avoid churn, but can easily see why we'd go the other way. > > @htejun WDYT? Let's leave it as-is. The main purpose is to serve as an example for future arena users. The benefit of keeping it simple trumps over supporting older compilers. thanks. -- tejun