From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f171.google.com (mail-pf1-f171.google.com [209.85.210.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7B6E91B373B for ; Thu, 4 Jul 2024 16:39:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720111162; cv=none; b=Zduxal00eigOjG1GerZL4s1LupTTblVJzTc5r4t6/g7xpA3b4LKkB+0MZn/NFQRB6LjVfhQsaYVUKnOHSGqGJYT2nR6S1HgtAXSVMOaI6KGn704JFk0hZ7NgCYGSwLEVRqrDCszBNEjMHzzH5++ZR1jqIXT2haXIjceTpQtxsyg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720111162; c=relaxed/simple; bh=rtIpW/5RA9cSnfghrN4/ocBZsfdfSJSLzhg/tnsBBEA=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Cawd9aOTijip9v9+jMMdde1kslrxtxP4S4ASdpcc5PIsjwe5m+oswqChURWnZEKsXqFnXE3NEYpslcEzFP/mCvLtlJ6VfW4R98JIk2tn6nLhFrjATUhuCjeK3qA75CGfSnnTsL+h9zcmDOOYMsuxCu+zhrvJWOfZUk5129XvD4U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=R4wAfQ7k; arc=none smtp.client-ip=209.85.210.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="R4wAfQ7k" Received: by mail-pf1-f171.google.com with SMTP id d2e1a72fcca58-7067108f2cdso595384b3a.1 for ; Thu, 04 Jul 2024 09:39:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1720111161; x=1720715961; darn=vger.kernel.org; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:from:to:cc:subject :date:message-id:reply-to; bh=rtIpW/5RA9cSnfghrN4/ocBZsfdfSJSLzhg/tnsBBEA=; b=R4wAfQ7k6Xg9llfhYyFu9VCBU8nwO9uKug+CcMBv8WrzoJWIXqed0Lq9S0p5UX7HXh D4uUax6/T3yLaVOtQ4t7PsPpVsr8CQRK7MJyF7NFDVcwLTz7RKpBjqax8zyOpUQlO2qa u/dXegqPvOP6/bnw4nfKKiJON1VILDQmLinyurUIwdvPSdZ1lV4b3LoZmfjRhGFFzcHK lANBH+YQY114w43Uj/R6+fY8XC9zEapjkZXuswKFq/esTyRHEcaTe9U4DeXdqgpmxxSf A1xqSTNHqjMQdtqHQN4z2nClMA/urc4XwyUGOk/Wfj5z0PvZzknRhBpFapYUv5VfOzwM daag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720111161; x=1720715961; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=rtIpW/5RA9cSnfghrN4/ocBZsfdfSJSLzhg/tnsBBEA=; b=X1kBn1Myuv0FQIwTR2E0T+F9CtRTwMIq6rqAVKumkS4W/21EkaE+WOsz/s/vQn8uxX VUAHPM5GsDVGiYVkNqIuqZzYJijLbLCdqd2Rq4dzc/TSZa/FA8++mxBsE9kadTCASNKF GwULMmEjbSHwVrsK0prlmZBU6vLnilOGQczD0rDUl3N68JFQAz14uuYj9Yknygoiq7ya ZvmZyVHqNfnP7ER8GiPyhwheiJ3ssqOpsT1Up6HySEcmB+ToTuCaPMalouI92OobaIUi f4fqj2JGa4hBaO4BFTLan98+mH7q3blx3c8JloZ+nQlpUzcyZ6IdMDEu5QMwr2nEGcWJ 32TA== X-Gm-Message-State: AOJu0YxcBaJZVG0TMaLp8kSL8FRqW6igj6MzaE9fByx5dL1rlegXvXCt 1Nmfyhy6kulXvxHuwIWMv6dGlsVpSwCTbZHn8n7vWs8wHzDovSvz X-Google-Smtp-Source: AGHT+IEPG9zFnwCt86p73eZvp4zIaoIeH7DY198qJtf3NyCYXjxKv/yVntRBswPuxb2w0y7rDuAJ3w== X-Received: by 2002:a05:6a00:3a13:b0:70a:ffc7:f921 with SMTP id d2e1a72fcca58-70b00aabfc8mr2412446b3a.22.1720111160716; Thu, 04 Jul 2024 09:39:20 -0700 (PDT) Received: from [192.168.0.31] ([38.34.87.7]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7080246f656sm12406525b3a.65.2024.07.04.09.39.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Jul 2024 09:39:20 -0700 (PDT) Message-ID: Subject: Re: [RFC bpf-next v1 3/8] bpf, x86: no_caller_saved_registers for bpf_get_smp_processor_id() From: Eduard Zingerman To: Puranjay Mohan , Andrii Nakryiko Cc: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, kernel-team@fb.com, yonghong.song@linux.dev, jose.marchesi@oracle.com Date: Thu, 04 Jul 2024 09:39:15 -0700 In-Reply-To: References: <20240629094733.3863850-1-eddyz87@gmail.com> <20240629094733.3863850-4-eddyz87@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-07-04 at 11:19 +0000, Puranjay Mohan wrote: [...] > And when we JIT the 'BPF_JMP | BPF_CALL' we add a mov instruction at the > end to move A0 to A5 on risc-v and R0 to R7 on arm64. >=20 > But when inlining the call we can directly put the result in A5 or R7.= =20 Oh, I see that additional move, thank you for explaining! Best regards, Eduard