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[2003:f6:5f14:6104::1b9]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-395c83b748bsm21809923f8f.39.2025.03.19.10.14.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Mar 2025 10:14:34 -0700 (PDT) From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= To: Andrew Morton Cc: Nicolas Pitre , linux-kernel@vger.kernel.org Subject: [PATCH] math64: Provide an uprounding variant of mul_u64_u64_div_u64() Date: Wed, 19 Mar 2025 18:14:25 +0100 Message-ID: <20250319171426.175460-2-u.kleine-koenig@baylibre.com> X-Mailer: git-send-email 2.47.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Developer-Signature: v=1; a=openpgp-sha256; l=1532; i=u.kleine-koenig@baylibre.com; h=from:subject; bh=cI905EyR1QV5ule/ac6xi5BGrF0In1v50J7J/neUJ84=; b=kA0DAAoBj4D7WH0S/k4ByyZiAGfa+3KgbXAJorWDeJ4QTijsVKG4NJE4nuYx5BZlbz2B0y888 IkBMwQAAQoAHRYhBD+BrGk6eh5Zia3+04+A+1h9Ev5OBQJn2vtyAAoJEI+A+1h9Ev5O3R8H/1ud 5wbjG3g2e2Cq4JVZZa9FkoqnoIHEUt4zsDfQZtoo5266l6IOC6k43IdoGPK6Vr0luU2OBXPG3GF TPxTaGF+hG6JIxw29VQJ/bi7VIg/78fFYooEUNKxxmg4JJ1vDuWk5+VnLB0InpNgLlAB5noImo6 7tKhleaKVCTw1Jpl2wUB5UERVBbGnGhzc8A9q96FR5eAJwINazcHkU+AEdn8VvqzS51CCJKWDzr XZ9t1dAatNjzqn+mtM/XWuiYDlB+Pg1IgWXUnGTbAyNhbcybvKSkDTeJa+9IMndx8LnJVkEKc6y pYp4aBgHsuG5r/n3642pBLQ1GEJ9rJMmxdRJgzU= X-Developer-Key: i=u.kleine-koenig@baylibre.com; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 Content-Transfer-Encoding: quoted-printable This is needed (at least) in the pwm-stm32 driver. Currently the pwm-stm32 driver implements this function itself. This private implementation can be dropped as a followup of this patch. Signed-off-by: Uwe Kleine-K=C3=B6nig Reviewed-by: Nicolas Pitre --- include/linux/math64.h | 1 + lib/math/div64.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/math64.h b/include/linux/math64.h index 6aaccc1626ab..0c545b3ddaa5 100644 --- a/include/linux/math64.h +++ b/include/linux/math64.h @@ -283,6 +283,7 @@ static inline u64 mul_u64_u32_div(u64 a, u32 mul, u32 d= ivisor) #endif /* mul_u64_u32_div */ =20 u64 mul_u64_u64_div_u64(u64 a, u64 mul, u64 div); +u64 mul_u64_u64_div_u64_roundup(u64 a, u64 mul, u64 div); =20 /** * DIV64_U64_ROUND_UP - unsigned 64bit divide with 64bit divisor rounded up diff --git a/lib/math/div64.c b/lib/math/div64.c index 5faa29208bdb..66beb669992d 100644 --- a/lib/math/div64.c +++ b/lib/math/div64.c @@ -267,3 +267,18 @@ u64 mul_u64_u64_div_u64(u64 a, u64 b, u64 c) } EXPORT_SYMBOL(mul_u64_u64_div_u64); #endif + +#ifndef mul_u64_u64_div_u64_roundup +u64 mul_u64_u64_div_u64_roundup(u64 a, u64 b, u64 c) +{ + u64 res =3D mul_u64_u64_div_u64(a, b, c); + /* Those multiplications might overflow but it doesn't matter */ + u64 rem =3D a * b - c * res; + + if (rem) + res +=3D 1; + + return res; +} +EXPORT_SYMBOL(mul_u64_u64_div_u64_roundup); +#endif base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b --=20 2.47.1