From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: [patch 015/118] ocfs2/dlm: move BITS_TO_BYTES() to bitops.h for wider use Date: Thu, 30 Jan 2020 22:11:47 -0800 Message-ID: <20200131061147.3fItv2dbJ%akpm@linux-foundation.org> References: <20200130221021.5f0211c56346d5485af07923@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:58734 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725907AbgAaGLt (ORCPT ); Fri, 31 Jan 2020 01:11:49 -0500 In-Reply-To: <20200130221021.5f0211c56346d5485af07923@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, gechangwei@live.cn, ghe@suse.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, junxiao.bi@oracle.com, linux-mm@kvack.org, mark@fasheh.com, mm-commits@vger.kernel.org, piaojun@huawei.com, skalluru@marvell.com, torvalds@linux-foundation.org From: Andy Shevchenko Subject: ocfs2/dlm: move BITS_TO_BYTES() to bitops.h for wider use There are users already and will be more of BITS_TO_BYTES() macro. Move it to bitops.h for wider use. In the case of ocfs2 the replacement is identical. As for bnx2x, there are two places where floor version is used. In the first case to calculate the amount of structures that can fit one memory page. In this case obviously the ceiling variant is correct and original code might have a potential bug, if amount of bits % 8 is not 0. In the second case the macro is used to calculate bytes transmitted in one microsecond. This will work for all speeds which is multiply of 1Gbps without any change, for the rest new code will give ceiling value, for instance 100Mbps will give 13 bytes, while old code gives 12 bytes and the arithmetically correct one is 12.5 bytes. Further the value is used to setup timer threshold which in any case has its own margins due to certain resolution. I don't see here an issue with slightly shifting thresholds for low speed connections, the card is supposed to utilize highest available rate, which is usually 10Gbps. Link: http://lkml.kernel.org/r/20200108121316.22411-1-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko Reviewed-by: Joseph Qi Acked-by: Sudarsana Reddy Kalluru Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Changwei Ge Cc: Gang He Cc: Jun Piao Signed-off-by: Andrew Morton --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_init.h | 1 - fs/ocfs2/dlm/dlmcommon.h | 4 ---- include/linux/bitops.h | 1 + 3 files changed, 1 insertion(+), 5 deletions(-) --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_init.h~ocfs2-dlm-move-bits_to_bytes-to-bitopsh-for-wider-use +++ a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_init.h @@ -296,7 +296,6 @@ static inline void bnx2x_dcb_config_qm(s * possible, the driver should only write the valid vnics into the internal * ram according to the appropriate port mode. */ -#define BITS_TO_BYTES(x) ((x)/8) /* CMNG constants, as derived from system spec calculations */ --- a/fs/ocfs2/dlm/dlmcommon.h~ocfs2-dlm-move-bits_to_bytes-to-bitopsh-for-wider-use +++ a/fs/ocfs2/dlm/dlmcommon.h @@ -688,10 +688,6 @@ struct dlm_begin_reco __be32 pad2; }; - -#define BITS_PER_BYTE 8 -#define BITS_TO_BYTES(bits) (((bits)+BITS_PER_BYTE-1)/BITS_PER_BYTE)