From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from 66-220-144-178.mail-mxout.facebook.com (66-220-144-178.mail-mxout.facebook.com [66.220.144.178]) (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 14D8631352B for ; Sun, 5 Apr 2026 16:53:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=66.220.144.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775408003; cv=none; b=B/M/fwysEAodlAdNQcWBIFCSg6OHcK4JVuUvAZ4bAc+1hHOkKlP3wOTCNXMO91nJSkTK8OW61df2ptPiTn6/Y6LzkKL+GECHxF0ij3hLKUWxyz/+ApzCrMMB80Biw6BIqwbYjuySp6pL4z1Ci2BjAxHgGJm6tlAiTSzxcJrT+zQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775408003; c=relaxed/simple; bh=rOVTP6j2o5AgrSQ2WEsvWutJxeFvkZXp06A9W4DYdjE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JEAQ4bhY35HO9HbnmUTi8J/18/58sG0oN7h8tV8cF/DD0+VV4FcsZDd1rDzrAKSjE2700fQHCjo6KPPRpakSQ+gKq2T8hnzX4pwN1YJdJOuJnDhWCzbC01Q0ybTLpVQ+qV05Ocu1SZmsq5y+dcG6nEqE7ZboaNnaXi15uIDVhok= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev; spf=fail smtp.mailfrom=linux.dev; arc=none smtp.client-ip=66.220.144.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=linux.dev Received: by devvm16039.vll0.facebook.com (Postfix, from userid 128203) id BC5EC361CEF57; Sun, 5 Apr 2026 09:53:10 -0700 (PDT) From: Yonghong Song To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , "Jose E . Marchesi" , kernel-team@fb.com, Martin KaFai Lau Subject: [PATCH bpf-next v2 02/11] bpf: Reuse MAX_BPF_FUNC_ARGS for maximum number of arguments Date: Sun, 5 Apr 2026 09:53:10 -0700 Message-ID: <20260405165310.828078-1-yonghong.song@linux.dev> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260405165300.826241-1-yonghong.song@linux.dev> References: <20260405165300.826241-1-yonghong.song@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Currently, MAX_BPF_FUNC_ARGS is used for tracepoint related progs where the number of parameters cannot exceed MAX_BPF_FUNC_ARGS. Here, MAX_BPF_FUNC_ARGS is reused to set a limit of the number of argumen= ts for bpf functions and kfunc's. The current value for MAX_BPF_FUNC_ARGS is 12 which should be sufficient for majority of bpf functions and kfunc's. Signed-off-by: Yonghong Song --- include/linux/bpf.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 35b1e25bd104..99701c4cc34e 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1151,6 +1151,10 @@ struct bpf_prog_offload { =20 /* The longest tracepoint has 12 args. * See include/trace/bpf_probe.h + * + * Also reuse this macro for maximum number of arguments a BPF function + * or a kfunc can have. Args 1-5 are passed in registers, args 6-12 via + * stack arg slots. */ #define MAX_BPF_FUNC_ARGS 12 =20 --=20 2.52.0