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Thu, 20 Mar 2025 11:54:58 -0400 (EDT) From: Daniel Brooks To: Alexandre Courbot Cc: Danilo Krummrich , David Airlie , John Hubbard , Ben Skeggs , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?Q?Bj=C3=B6rn?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Simona Vetter , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH RFC v3 6/7] gpu: nova-core: add basic timer device In-Reply-To: <20250320-nova_timer-v3-6-79aa2ad25a79@nvidia.com> (Alexandre Courbot's message of "Thu, 20 Mar 2025 22:39:14 +0900") References: <20250320-nova_timer-v3-0-79aa2ad25a79@nvidia.com> <20250320-nova_timer-v3-6-79aa2ad25a79@nvidia.com> Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAABGdBTUEAALGOfPtRkwAAABJQ TFRFpKfbdou67PD6JjJgAwUWXGSeIcyLHgAAAkZJREFUOI1VU8Fy6yAMxLi+Q13fCZ3cnQL3dqTc 7RD+/1feStDXVnXHDuvVSivZTMba2GPdw3gyCGcMAFxTyrTd9dwGoxHiZX9PmRFUHYAQlGGtXY+F Uk0SJOxgJiUEnH1qkitT9D+pQub7qGAmUbR6bu3CvI96Yv6QqkBBMrsyfZccr1/RDXGDTLf4P7ZY glVxe2V+/ACXWO1gvDO9/gDRpFFVmPluvLcmBjd5H6d8DEte+Pbk4rcY/Fa5tLKLOtCZsuQKYhpa LOkYDT7hESya7/WIET3lfQBqX0pwFtbI832Is0ayMUR9B+12xjgPCQ089cfwkCkX6L5TPmRelJTh zMS0Sz1PyjLAMCUWjcmgQLWQMds+e3aaauZDf9dU9A2/8kPVF2odCUoMKHkfjJR+mbgC+DRiycw5 3XSqGe6HmhN/AWjHypkAXOAFW5EiuA1ge2GiZuMb0s1fSEXcATeLUfbyEY2L8yPOmdSsdghQXx3K pz2eoeXuYvMCINVFDrCdNfVUp4eJ6cSEbjbgFjBEvonGGTrgv9cHjAc8aVgSAPoxaONbzfwhDIhR at7IIS7fAGiDSwIA9alhhTBzfA7YM2FY6eMwayrIGK8FDFmshmUA43WqhFtpvoqG9HHaJ7fqtgTz 8EWVkgZgtsylFliHDgk0MB7KAEC45C/rgnGvanNLXyzOeTzcT2nw/N44gfrtYXRQLoz9Q3TgmJRx 2Mx/Q51qzpm+l3m8z2SWBqC5+PZXAtNYlGFf/gKfHfjFkDT4x7od7R+w3Ls+ZdQBuQAAAABJRU5E rkJggg== Date: Thu, 20 Mar 2025 08:54:57 -0700 Message-ID: <87v7s3zoha.fsf@db48x.net> User-Agent: Gnus/5.13 (Gnus v5.13) 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 Content-Transfer-Encoding: quoted-printable Alexandre Courbot writes: > +impl Add for Timestamp { > + type Output =3D Self; > + > + fn add(mut self, rhs: Duration) -> Self::Output { > + let mut nanos =3D rhs.as_nanos(); > + while nanos > u64::MAX as u128 { > + self.0 =3D self.0.wrapping_add(nanos as u64); > + nanos -=3D u64::MAX as u128; > + } > + > + Timestamp(self.0.wrapping_add(nanos as u64)) > + } > +} Perhaps I missed something, but couldn=E2=80=99t you simplify this method l= ike this: fn add(mut self, rhs: Duration) -> Self::Output { let stamp =3D self.0 as u128; Timestamp(stamp.wrapping_add(rhs.as_nanos()) as u64) } db48x