From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DBF5EC43381 for ; Fri, 29 Mar 2019 11:38:31 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AB88C2183E for ; Fri, 29 Mar 2019 11:38:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Vmy6K7Xj" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB88C2183E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=s/+lob2krjye5M4RO/AqXPs15Z5lrIf13cOtupNzAdU=; b=Vmy6K7Xj/toDlT qLzEGMn3LsdpPS5euE3TCIrat9Wf9iCgNIIUB5iqdQjQ6IvHAKVfrZr0Uz90u9rX6YuUsQvFqSiHX MKUtnpsVWsNmBpyThEcLFRUSiPV+LjKyoyDu38rFe4SkMocEYfLJSbIEgAGGtPaPF9kGqSmzHQABq RJ9J43UQEi87tQPRa4C03wKy80ZpI5dxXk2LgXsUWHjS1UhVwD7fKU7xKNijX/8P0C2uKgJxPNolb +uxVEPfDTmURIUh9SA6WzshaZuYNKmFag2GLqs03tz+kdkv2soxbmM3Yos+y0Tcq/tDBoHn0MVHVz XwxLGdX/HQ7+WBL8StqA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h9pq8-0007wZ-HF; Fri, 29 Mar 2019 11:38:28 +0000 Received: from mga06.intel.com ([134.134.136.31]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1h9pq6-0007vw-3R for linux-arm-kernel@lists.infradead.org; Fri, 29 Mar 2019 11:38:27 +0000 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Mar 2019 04:38:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,284,1549958400"; d="scan'208";a="138315353" Received: from smile.fi.intel.com (HELO smile) ([10.237.72.86]) by orsmga003.jf.intel.com with ESMTP; 29 Mar 2019 04:38:21 -0700 Received: from andy by smile with local (Exim 4.92) (envelope-from ) id 1h9ppz-0004VM-I2; Fri, 29 Mar 2019 13:38:19 +0200 Date: Fri, 29 Mar 2019 13:38:19 +0200 From: Andy Shevchenko To: William Breathitt Gray Subject: Re: [PATCH v14 00/11] Introduce the for_each_set_clump8 macro Message-ID: <20190329113819.GR9224@smile.fi.intel.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190329_043826_195479_F1E09877 X-CRM114-Status: GOOD ( 21.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, linux-gpio@vger.kernel.org, yamada.masahiro@socionext.com, linus.walleij@linaro.org, linux-pm@vger.kernel.org, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org, bgolaszewski@baylibre.com, lukas@wunner.de, geert@linux-m68k.org, akpm@linux-foundation.org, preid@electromag.com.au, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Mar 29, 2019 at 12:03:30PM +0900, William Breathitt Gray wrote: > Changes in v14: > - Redefine bitmap_get_value8, bitmap_set_value8, and find_next_clump8 > as static inline functions > - Rename 'idx' variable to 'index' in the bitmap_get_value8 and > bitmap_set_value8 functions > - Remove superfluous parens in gen_74x164_set_multiple > Thank you! FWIW, Reviewed-by: Andy Shevchenko > While adding GPIO get_multiple/set_multiple callback support for various > drivers, I noticed a pattern of looping manifesting that would be useful > standardized as a macro. > > This patchset introduces the for_each_set_clump8 macro and utilizes it > in several GPIO drivers. The for_each_set_clump macro8 facilitates a > for-loop syntax that iterates over a memory region entire groups of set > bits at a time. > > For example, suppose you would like to iterate over a 32-bit integer 8 > bits at a time, skipping over 8-bit groups with no set bit, where > XXXXXXXX represents the current 8-bit group: > > Example: 10111110 00000000 11111111 00110011 > First loop: 10111110 00000000 11111111 XXXXXXXX > Second loop: 10111110 00000000 XXXXXXXX 00110011 > Third loop: XXXXXXXX 00000000 11111111 00110011 > > Each iteration of the loop returns the next 8-bit group that has at > least one set bit. > > The for_each_set_clump8 macro has four parameters: > > * start: set to the bit offset of the current clump > * clump: set to the current clump value > * bits: bitmap to search within > * size: bitmap size in number of bits > > In this version of the patchset, the for_each_set_clump macro has been > reimplemented and simplified based on the suggestions provided by Rasmus > Villemoes and Andy Shevchenko in the version 4 submission. > > In particular, the function of the for_each_set_clump macro has been > restricted to handle only 8-bit clumps; the drivers that use the > for_each_set_clump macro only handle 8-bit ports so a generic > for_each_set_clump implementation is not necessary. Thus, a solution for > large clumps (i.e. those larger than the width of a bitmap word) can be > postponed until a driver appears that actually requires such a generic > for_each_set_clump implementation. > > For what it's worth, a semi-generic for_each_set_clump (i.e. for clumps > smaller than the width of a bitmap word) can be implemented by simply > replacing the hardcoded '8' and '0xFF' instances with respective > variables. I have not yet had a need for such an implementation, and > since it falls short of a true generic for_each_set_clump function, I > have decided to forgo such an implementation for now. > > In addition, the bitmap_get_value8 and bitmap_set_value8 functions are > introduced to get and set 8-bit values respectively. Their use is based > on the behavior suggested in the patchset version 4 review. > > William Breathitt Gray (11): > bitops: Introduce the for_each_set_clump8 macro > lib/test_bitmap.c: Add for_each_set_clump8 test cases > gpio: 104-dio-48e: Utilize for_each_set_clump8 macro > gpio: 104-idi-48: Utilize for_each_set_clump8 macro > gpio: gpio-mm: Utilize for_each_set_clump8 macro > gpio: ws16c48: Utilize for_each_set_clump8 macro > gpio: pci-idio-16: Utilize for_each_set_clump8 macro > gpio: pcie-idio-24: Utilize for_each_set_clump8 macro > gpio: uniphier: Utilize for_each_set_clump8 macro > gpio: 74x164: Utilize the for_each_set_clump8 macro > thermal: intel: intel_soc_dts_iosf: Utilize for_each_set_clump8 macro > > drivers/gpio/gpio-104-dio-48e.c | 73 ++++---------- > drivers/gpio/gpio-104-idi-48.c | 36 ++----- > drivers/gpio/gpio-74x164.c | 19 ++-- > drivers/gpio/gpio-gpio-mm.c | 73 ++++---------- > drivers/gpio/gpio-pci-idio-16.c | 75 +++++--------- > drivers/gpio/gpio-pcie-idio-24.c | 109 ++++++++------------- > drivers/gpio/gpio-uniphier.c | 16 ++- > drivers/gpio/gpio-ws16c48.c | 73 ++++---------- > drivers/thermal/intel/intel_soc_dts_iosf.c | 29 +++--- > drivers/thermal/intel/intel_soc_dts_iosf.h | 2 - > include/asm-generic/bitops/find.h | 61 ++++++++++++ > include/linux/bitops.h | 5 + > lib/test_bitmap.c | 65 ++++++++++++ > 13 files changed, 299 insertions(+), 337 deletions(-) > > -- > 2.21.0 > -- With Best Regards, Andy Shevchenko _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel