From: "Eliot Courtney" <ecourtney@nvidia.com>
To: "Yury Norov" <ynorov@nvidia.com>,
"Alexandre Courbot" <acourbot@nvidia.com>
Cc: "Eliot Courtney" <ecourtney@nvidia.com>,
"Alice Ryhl" <aliceryhl@google.com>,
"Burak Emir" <burak.emir@gmail.com>,
"Yury Norov" <yury.norov@gmail.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Boqun Feng" <boqun@kernel.org>, "Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Daniel Almeida" <daniel.almeida@collabora.com>,
"Tamir Duberstein" <tamird@kernel.org>,
"Onur Özkan" <work@onurozkan.dev>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"John Hubbard" <jhubbard@nvidia.com>,
"Alistair Popple" <apopple@nvidia.com>,
"Timur Tabi" <ttabi@nvidia.com>, "Zhi Wang" <zhiw@nvidia.com>,
rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
nova-gpu@lists.linux.dev, dri-devel@lists.freedesktop.org,
dri-devel <dri-devel-bounces@lists.freedesktop.org>
Subject: Re: [PATCH v9 8/9] rust: id_pool: do not round capacity up to BitmapVec::MAX_INLINE_LEN
Date: Fri, 16 Oct 2026 16:15:20 +0900 [thread overview]
Message-ID: <DM62T4RN38EX.2RMVNDEJV9T5U@nvidia.com> (raw)
In-Reply-To: <atDclcwHGykChUim@yury>
On Thu Oct 15, 2026 at 11:00 PM JST, Yury Norov wrote:
[...]
>> As it turns out we would never perform a zero-sized malloc, even for a
>> zero-sized bitmap. `IdPool` is backed by a `BitmapVec`, which up to
>> `usize::BITS` uses an inline member as backing storage. So we would
>> never call `bitmap_zalloc` with a value of 0, making the safety concern
>> moot.
>
> OK. Then please remove the 0-length alloc with the following re-alloc
> example from the patch. use 1-bit allocation, as an extreme value, if
> needed.
Sure, I will update the example.
next prev parent reply other threads:[~2026-10-16 7:16 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 2:42 [PATCH v9 0/9] rust: Add support for reserving of ranges of IDs Eliot Courtney
2026-09-30 2:42 ` [PATCH v9 1/9] rust: bitmap: use function-level cfg on kunit test Eliot Courtney
2026-09-30 2:42 ` [PATCH v9 2/9] rust: bitmap: restrict bitmap length to at most i32::MAX Eliot Courtney
2026-09-30 2:42 ` [PATCH v9 3/9] rust: sizes: add sub-1K size constants Eliot Courtney
2026-09-30 9:12 ` Miguel Ojeda
2026-09-30 11:04 ` Alexandre Courbot
2026-09-30 11:22 ` Miguel Ojeda
2026-10-01 0:40 ` Gary Guo
2026-10-01 5:23 ` Eliot Courtney
2026-09-30 2:42 ` [PATCH v9 4/9] rust: sizes: implement SizeConstants for Alignment Eliot Courtney
2026-09-30 9:12 ` Miguel Ojeda
2026-09-30 2:42 ` [PATCH v9 5/9] rust: use Alignment size constants Eliot Courtney
2026-09-30 2:42 ` [PATCH v9 6/9] rust: bitmap: add contiguous area operations Eliot Courtney
2026-09-30 4:41 ` Yury Norov
2026-09-30 2:42 ` [PATCH v9 7/9] rust: id_pool: add contiguous ID reservation Eliot Courtney
2026-09-30 2:51 ` sashiko-bot
2026-09-30 4:50 ` Yury Norov
2026-09-30 2:42 ` [PATCH v9 8/9] rust: id_pool: do not round capacity up to BitmapVec::MAX_INLINE_LEN Eliot Courtney
2026-09-30 2:52 ` sashiko-bot
2026-09-30 5:05 ` Yury Norov
2026-10-01 6:20 ` Alexandre Courbot
2026-10-08 15:47 ` Yury Norov
2026-10-08 16:04 ` Gary Guo
2026-10-09 14:07 ` Alexandre Courbot
2026-10-09 18:48 ` Burak Emir
2026-10-14 2:04 ` Alexandre Courbot
2026-10-14 7:20 ` Burak Emir
2026-10-15 13:30 ` Alexandre Courbot
2026-10-15 14:00 ` Yury Norov
2026-10-16 7:15 ` Eliot Courtney [this message]
2026-09-30 2:42 ` [PATCH v9 9/9] gpu: nova-core: add ChannelIdPool Eliot Courtney
2026-10-08 15:04 ` [PATCH v9 0/9] rust: Add support for reserving of ranges of IDs Alexandre Courbot
2026-10-11 9:15 ` Miguel Ojeda
2026-10-13 13:26 ` Miguel Ojeda
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