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([2600:8803:e7e4:500:7bb8:950b:327d:4ba4]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-3e41f2557a1sm2394214fac.21.2025.11.07.13.09.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 07 Nov 2025 13:09:58 -0800 (PST) Message-ID: Date: Fri, 7 Nov 2025 15:09:58 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: =?UTF-8?Q?Re=3A_=5BPATCH_v2_2/6=5D_units=3A_Add_32-_and_64-bit_sign?= =?UTF-8?Q?ed_values_of_=CF=80?= To: Andy Shevchenko , Hans Verkuil , linux-iio@vger.kernel.org, chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Cc: Jonathan Cameron , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , Benson Leung , Guenter Roeck , Lars-Peter Clausen , Michael Hennerich , Mauro Carvalho Chehab , "Daniel W. S. Almeida" References: <20251107201005.3156118-1-andriy.shevchenko@linux.intel.com> <20251107201005.3156118-3-andriy.shevchenko@linux.intel.com> Content-Language: en-US From: David Lechner In-Reply-To: <20251107201005.3156118-3-andriy.shevchenko@linux.intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 11/7/25 2:03 PM, Andy Shevchenko wrote: > There are a few drivers that want to have these values, and > one more known to come soon. Let's define the values for them. > > Signed-off-by: Andy Shevchenko > --- > include/linux/units.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/include/linux/units.h b/include/linux/units.h > index f626e212d4ca..5b3293bce04c 100644 > --- a/include/linux/units.h > +++ b/include/linux/units.h > @@ -21,6 +21,12 @@ > #define PICO 1000000000000ULL > #define FEMTO 1000000000000000ULL > > +/* Value of π * 10⁸ (fits s32 or signed int) */ > +#define PI 314159265 It isn't clear to me at all in the other patches that e.g. DIV_ROUND_UP(PI, 1000) would be π ✕ 10⁴ (rounded to nearest integer, of course). Calling these PI_E8 and PI_E18 or PI_x10_8 and PI_x10_18 would help to clear that up. > + > +/* Value of π * 10¹⁸ (fits s64 or signed long long) */ > +#define PI_LL 3141592653589793238LL > + > /* Hz based multipliers */ > #define NANOHZ_PER_HZ 1000000000UL > #define MICROHZ_PER_HZ 1000000UL