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[23.128.96.18]) by mx.google.com with ESMTP id y15si947361edm.260.2020.07.08.16.04.47; Wed, 08 Jul 2020 16:04:47 -0700 (PDT) Received-SPF: pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=qBuqwOKV; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726353AbgGHXEn (ORCPT + 9 others); Wed, 8 Jul 2020 19:04:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726174AbgGHXEn (ORCPT ); Wed, 8 Jul 2020 19:04:43 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09C2AC061A0B for ; Wed, 8 Jul 2020 16:04:43 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id s9so504519ybj.18 for ; Wed, 08 Jul 2020 16:04:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=Jny5Jx5rRXxMy/sC2H9QJqimOZ5hbGj1rz6/5Fw+2UM=; b=qBuqwOKV7bQlTsZUh6QG8X200PnhiWCcbV0CYfl/19ebuoYpaCjHciGfnwc4xpERiT oGPwUKczb7e640dhE0Aetn212ws5ZrUM3c/EQj5xTcSKYbcE5ExNgxomuuDJ+acfv71V MJaEaoZJycaKvBSrcwpO2oNt5soZHpkv881Iu5Jf4BTm7TVwPgMQVIrq+Y4batucKEz6 on/7aQN4fzu871sdsToAy7qBev0UAp1EEg6tXuHsLfTp/e15QD/vrV5NTyRXFtj7HfMI xA8Kz5pTqUGoY7ZjHluAxocSkJAJtR+nFsshyr1oRyruKJ0sXpixnNJIo2xRa0f9R5Ar REyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Jny5Jx5rRXxMy/sC2H9QJqimOZ5hbGj1rz6/5Fw+2UM=; b=QqWOCAF1N1Vk0lJnhQJgBqklnvzxM6RtHfgmSidRli3qoyzdBL3evvGPo4hLxEOPgj hIWj6uC85coXQlsquDa9hLvkcghLrtN1oKVwPTk2YQYGorYfFD8l6XN5m7eLnw7s7owd 8RR78DXqWYmGOaauk315VFuu8xj565j0OXQdhSmLPCkwhbSOIpA8zllO7ItumGJrcLY7 ZA4muIMckHweSilkS+ZZCL//Zr9E3IQlWn4L5O3knO1d+HzDxe51jki0SvUMnFj+LzCX hgiON//SgKg8w5jkhnk3M7rxGvZCij71De9QMdlS87CxQlsRHuaZ35UfG0nxVgbgBa3r J6Vg== X-Gm-Message-State: AOAM5332i+v7O3gGrdIHMmVBzlz+E7tl+pZ4gqUnIa/yGLaZ71BNIORr YVZAc+IizcgimoJYLZ+yZGgsxhO4QKxhSmjCBa8= X-Received: by 2002:a25:bf8c:: with SMTP id l12mr106119503ybk.447.1594249482233; Wed, 08 Jul 2020 16:04:42 -0700 (PDT) Date: Wed, 8 Jul 2020 16:04:02 -0700 In-Reply-To: <20200708230402.1644819-1-ndesaulniers@google.com> Message-Id: <20200708230402.1644819-3-ndesaulniers@google.com> Mime-Version: 1.0 References: <20200708230402.1644819-1-ndesaulniers@google.com> X-Mailer: git-send-email 2.27.0.383.g050319c2ae-goog Subject: [PATCH v2 2/2] bitfield.h: split up __BF_FIELD_CHECK macro From: Nick Desaulniers To: "David S . Miller" Cc: Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , John Fastabend , KP Singh , oss-drivers@netronome.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski , Alex Elder , Nick Desaulniers Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This macro has a few expansion sites that pass literal 0s as parameters. Split these up so that we do the precise checks where we care about them. Suggested-by: Alex Elder Signed-off-by: Nick Desaulniers --- Changes V1-V2: * New patch in v2. * Rebased on 0001. .../netronome/nfp/nfpcore/nfp_nsp_eth.c | 11 ++++---- include/linux/bitfield.h | 26 +++++++++++++------ 2 files changed, 24 insertions(+), 13 deletions(-) -- 2.27.0.383.g050319c2ae-goog Reviewed-by: Alex Elder Reviewed-by: Alex Elder diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c index 311a5be25acb..938fc733fccb 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c @@ -492,11 +492,12 @@ nfp_eth_set_bit_config(struct nfp_nsp *nsp, unsigned int raw_idx, return 0; } -#define NFP_ETH_SET_BIT_CONFIG(nsp, raw_idx, mask, val, ctrl_bit) \ - ({ \ - __BF_FIELD_CHECK(mask, 0ULL, val, "NFP_ETH_SET_BIT_CONFIG: "); \ - nfp_eth_set_bit_config(nsp, raw_idx, mask, __bf_shf(mask), \ - val, ctrl_bit); \ +#define NFP_ETH_SET_BIT_CONFIG(nsp, raw_idx, mask, val, ctrl_bit) \ + ({ \ + __BF_FIELD_CHECK_MASK(mask, "NFP_ETH_SET_BIT_CONFIG: "); \ + __BF_FIELD_CHECK_VAL(mask, val, "NFP_ETH_SET_BIT_CONFIG: "); \ + nfp_eth_set_bit_config(nsp, raw_idx, mask, __bf_shf(mask), \ + val, ctrl_bit); \ }) /** diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h index 4e035aca6f7e..79651867beb3 100644 --- a/include/linux/bitfield.h +++ b/include/linux/bitfield.h @@ -41,18 +41,26 @@ #define __bf_shf(x) (__builtin_ffsll(x) - 1) -#define __BF_FIELD_CHECK(_mask, _reg, _val, _pfx) \ +#define __BF_FIELD_CHECK_MASK(_mask, _pfx) \ ({ \ BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask), \ _pfx "mask is not constant"); \ BUILD_BUG_ON_MSG((_mask) == 0, _pfx "mask is zero"); \ + __BUILD_BUG_ON_NOT_POWER_OF_2((_mask) + \ + (1ULL << __bf_shf(_mask))); \ + }) + +#define __BF_FIELD_CHECK_VAL(_mask, _val, _pfx) \ + ({ \ BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ? \ ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \ _pfx "value too large for the field"); \ - BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull, \ + }) + +#define __BF_FIELD_CHECK_REG(_mask, _reg, _pfx) \ + ({ \ + BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ULL, \ _pfx "type of reg too small for mask"); \ - __BUILD_BUG_ON_NOT_POWER_OF_2((_mask) + \ - (1ULL << __bf_shf(_mask))); \ }) /** @@ -64,7 +72,7 @@ */ #define FIELD_MAX(_mask) \ ({ \ - __BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_MAX: "); \ + __BF_FIELD_CHECK_MASK(_mask, "FIELD_MAX: "); \ (typeof(_mask))((_mask) >> __bf_shf(_mask)); \ }) @@ -77,7 +85,7 @@ */ #define FIELD_FIT(_mask, _val) \ ({ \ - __BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_FIT: "); \ + __BF_FIELD_CHECK_MASK(_mask, "FIELD_FIT: "); \ !((((typeof(_mask))_val) << __bf_shf(_mask)) & ~(_mask)); \ }) @@ -91,7 +99,8 @@ */ #define FIELD_PREP(_mask, _val) \ ({ \ - __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \ + __BF_FIELD_CHECK_MASK(_mask, "FIELD_PREP: "); \ + __BF_FIELD_CHECK_VAL(_mask, _val, "FIELD_PREP: "); \ ((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask); \ }) @@ -105,7 +114,8 @@ */ #define FIELD_GET(_mask, _reg) \ ({ \ - __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \ + __BF_FIELD_CHECK_MASK(_mask, "FIELD_GET: "); \ + __BF_FIELD_CHECK_REG(_mask, _reg, "FIELD_GET: "); \ (typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \ })