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([140.113.216.168]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-306dd171991sm1952304a91.37.2025.04.09.08.45.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Apr 2025 08:45:43 -0700 (PDT) From: Kuan-Wei Chiu To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, jk@ozlabs.org, joel@jms.id.au, eajames@linux.ibm.com, andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, dmitry.torokhov@gmail.com, mchehab@kernel.org, awalls@md.metrocast.net, hverkuil@xs4all.nl, miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, louis.peens@corigine.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, parthiban.veerasooran@microchip.com, arend.vanspriel@broadcom.com, johannes@sipsolutions.net, gregkh@linuxfoundation.org, jirislaby@kernel.org, yury.norov@gmail.com, akpm@linux-foundation.org, jdelvare@suse.com, linux@roeck-us.net, alexandre.belloni@bootlin.com, pgaj@cadence.com Cc: hpa@zytor.com, alistair@popple.id.au, linux@rasmusvillemoes.dk, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@gmail.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-fsi@lists.ozlabs.org, dri-devel@lists.freedesktop.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, linux-mtd@lists.infradead.org, oss-drivers@corigine.com, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, brcm80211@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, linux-serial@vger.kernel.org, bpf@vger.kernel.org, jserv@ccns.ncku.edu.tw, Frank.Li@nxp.com, linux-hwmon@vger.kernel.org, linux-i3c@lists.infradead.org, david.laight.linux@gmail.com, andrew.cooper3@citrix.com, Kuan-Wei Chiu , Yu-Chun Lin Subject: [PATCH v4 06/13] lib/bch: Replace open-coded parity calculation with parity_odd() Date: Wed, 9 Apr 2025 23:43:49 +0800 Message-Id: <20250409154356.423512-7-visitorckw@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250409154356.423512-1-visitorckw@gmail.com> References: <20250409154356.423512-1-visitorckw@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250409_084544_749444_63FA1C08 X-CRM114-Status: UNSURE ( 8.54 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Refactor parity calculations to use the standard parity_odd() helper. This change eliminates redundant implementations. Co-developed-by: Yu-Chun Lin Signed-off-by: Yu-Chun Lin Signed-off-by: Kuan-Wei Chiu --- lib/bch.c | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) diff --git a/lib/bch.c b/lib/bch.c index 1c0cb07cdfeb..3f14d69f373e 100644 --- a/lib/bch.c +++ b/lib/bch.c @@ -311,18 +311,6 @@ static inline int deg(unsigned int poly) return fls(poly)-1; } -static inline int parity(unsigned int x) -{ - /* - * public domain code snippet, lifted from - * http://www-graphics.stanford.edu/~seander/bithacks.html - */ - x ^= x >> 1; - x ^= x >> 2; - x = (x & 0x11111111U) * 0x11111111U; - return (x >> 28) & 1; -} - /* Galois field basic operations: multiply, divide, inverse, etc. */ static inline unsigned int gf_mul(struct bch_control *bch, unsigned int a, @@ -524,7 +512,7 @@ static int solve_linear_system(struct bch_control *bch, unsigned int *rows, tmp = 0; for (r = m-1; r >= 0; r--) { mask = rows[r] & (tmp|1); - tmp |= parity(mask) << (m-r); + tmp |= parity_odd(mask) << (m-r); } sol[p] = tmp >> 1; } -- 2.34.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/