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Sat, 02 Mar 2019 23:44:22 -0800 (PST) From: William Breathitt Gray To: linus.walleij@linaro.org Subject: [PATCH v9 0/9] Introduce the for_each_set_clump8 macro Date: Sun, 3 Mar 2019 16:44:39 +0900 Message-Id: X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190302_234427_141985_A1D19294 X-CRM114-Status: GOOD ( 12.42 ) 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, yamada.masahiro@socionext.com, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org, William Breathitt Gray , linux-gpio@vger.kernel.org, bgolaszewski@baylibre.com, akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, 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 Changes in v9: - Return unsigned long for bitmap_get_value8 for consistency 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 (9): 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 drivers/gpio/gpio-104-dio-48e.c | 73 ++++++-------------- drivers/gpio/gpio-104-idi-48.c | 37 +++------- drivers/gpio/gpio-gpio-mm.c | 73 ++++++-------------- drivers/gpio/gpio-pci-idio-16.c | 75 ++++++++------------ drivers/gpio/gpio-pcie-idio-24.c | 111 +++++++++++------------------- drivers/gpio/gpio-uniphier.c | 16 ++--- drivers/gpio/gpio-ws16c48.c | 72 ++++++------------- include/asm-generic/bitops/find.h | 14 ++++ include/linux/bitops.h | 5 ++ lib/find_bit.c | 81 ++++++++++++++++++++++ lib/test_bitmap.c | 65 +++++++++++++++++ 11 files changed, 313 insertions(+), 309 deletions(-) -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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=-3.0 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 A1630C4360F for ; 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Sat, 02 Mar 2019 23:47:09 -0800 (PST) Received: from localhost.localdomain ([2001:268:c0a5:3b5c:c70:4af9:86e2:2]) by smtp.gmail.com with ESMTPSA id c13sm4332927pfm.34.2019.03.02.23.47.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 02 Mar 2019 23:47:09 -0800 (PST) From: William Breathitt Gray To: linus.walleij@linaro.org Subject: [PATCH v9 0/9] Introduce the for_each_set_clump8 macro Date: Sun, 3 Mar 2019 16:47:58 +0900 Message-Id: X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190302_234710_206696_C4583135 X-CRM114-Status: GOOD ( 12.33 ) 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, yamada.masahiro@socionext.com, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org, William Breathitt Gray , linux-gpio@vger.kernel.org, bgolaszewski@baylibre.com, akpm@linux-foundation.org, andriy.shevchenko@linux.intel.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Message-ID: <20190303074758.hp_nIWFz3uaN3RfsEqhss-oPN4QiAMxqwvf8HKTTcUk@z> Changes in v9: - Utilize for_each_set_clump8 in uniphier_gpio_set_multiple 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 (9): 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 drivers/gpio/gpio-104-dio-48e.c | 73 ++++++-------------- drivers/gpio/gpio-104-idi-48.c | 37 +++------- drivers/gpio/gpio-gpio-mm.c | 73 ++++++-------------- drivers/gpio/gpio-pci-idio-16.c | 75 ++++++++------------ drivers/gpio/gpio-pcie-idio-24.c | 111 +++++++++++------------------- drivers/gpio/gpio-uniphier.c | 16 ++--- drivers/gpio/gpio-ws16c48.c | 72 ++++++------------- include/asm-generic/bitops/find.h | 14 ++++ include/linux/bitops.h | 5 ++ lib/find_bit.c | 81 ++++++++++++++++++++++ lib/test_bitmap.c | 65 +++++++++++++++++ 11 files changed, 313 insertions(+), 309 deletions(-) -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel