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[96.27.162.190]) by smtp.gmail.com with ESMTPSA id x28sm2235985qtv.8.2021.01.20.16.06.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Jan 2021 16:06:34 -0800 (PST) From: Yury Norov To: linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org, linux-arch@vger.kernel.org Cc: Yury Norov , Geert Uytterhoeven , Yoshinori Sato , Rich Felker , Arnd Bergmann , Dennis Zhou , Andrew Morton , Wolfram Sang , David Sterba , Andy Shevchenko , Stefano Brivio , "Ma, Jianpeng" , Wei Yang , Josh Poimboeuf , Rasmus Villemoes Subject: [PATCH 0/6] lib/find_bit: fast path for small bitmaps Date: Wed, 20 Jan 2021 16:06:24 -0800 Message-Id: <20210121000630.371883-1-yury.norov@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org Bitmap operations are much simpler and faster in case of small bitmaps, whicn fit into a single word. In linux/bitmap.h we have a machinery that allows compiler to replace actual function call with a few instructions if bitmaps passed into the function is small and its size is known at compile time. find_next_*_bit() lacks this functionality; despite users will benefit from it a lot. One important example is cpumask subsystem if NR_CPUS <= BITS_PER_LONG. In the very best case, the compiler may replace a find_*_bit() call for such a bitmap with a single ffs or ffz instruction. Yury Norov (6): arch: rearrahge headers inclusion order in asm/bitops for m68k and sh bitmap: move some macros from linux/bitmap.h to linux/bitops.h tools: sync bitops macro definitions with the kernel lib: inline _find_next_bit() wrappers lib: add fast path for find_next_*_bit() lib: add fast path for find_first_*_bit() and find_last_bit() arch/m68k/include/asm/bitops.h | 4 +- arch/sh/include/asm/bitops.h | 3 +- include/asm-generic/bitops/find.h | 123 +++++++++++++++++++++++++++--- include/asm-generic/bitops/le.h | 45 ++++++++++- include/linux/bitmap.h | 11 --- include/linux/bitops.h | 23 +++--- lib/find_bit.c | 68 ++--------------- tools/include/linux/bitmap.h | 11 --- tools/include/linux/bitops.h | 11 +++ 9 files changed, 188 insertions(+), 111 deletions(-)