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no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Joel Fernandes , Alistair Popple , Eliot Courtney , Zhi Wang , Simona Vetter , Bjorn Helgaas , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , nouveau@lists.freedesktop.org, rust-for-linux@vger.kernel.org, LKML X-Mailman-Version: 3.3.8 Precedence: list List-Id: Nouveau development list Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Drivers that operate on 64-bit address spaces (GPU framebuffer layouts, DMA regions, etc.) frequently need these size constants as a u64 type. Today this requires repeated usize-to-u64 conversion calls like usize_as_u64(SZ_1M) or u64::from_safe_cast(SZ_1M), which adds boilerplate without any safety benefit. Add u64-typed constants (SZ_1K_U64 through SZ_2G_U64) alongside the existing usize constants. Every value fits in u64 (actually, within a u32 for that matter), so the as-cast is always lossless. Signed-off-by: John Hubbard --- rust/kernel/sizes.rs | 51 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/rust/kernel/sizes.rs b/rust/kernel/sizes.rs index 661e680d9330..a11c134be64e 100644 --- a/rust/kernel/sizes.rs +++ b/rust/kernel/sizes.rs @@ -48,3 +48,54 @@ pub const SZ_1G: usize = bindings::SZ_1G as usize; /// 0x80000000 pub const SZ_2G: usize = bindings::SZ_2G as usize; + +// `u64` variants of the size constants. These are the same values as the +// `usize` constants above, but typed as `u64` to avoid repeated conversion +// boilerplate in code that operates on 64-bit address spaces. +// +// CAST: every SZ_* value below fits in u64, so `as u64` is always lossless. + +/// [`SZ_1K`] as a [`u64`]. +pub const SZ_1K_U64: u64 = SZ_1K as u64; +/// [`SZ_2K`] as a [`u64`]. +pub const SZ_2K_U64: u64 = SZ_2K as u64; +/// [`SZ_4K`] as a [`u64`]. +pub const SZ_4K_U64: u64 = SZ_4K as u64; +/// [`SZ_8K`] as a [`u64`]. +pub const SZ_8K_U64: u64 = SZ_8K as u64; +/// [`SZ_16K`] as a [`u64`]. +pub const SZ_16K_U64: u64 = SZ_16K as u64; +/// [`SZ_32K`] as a [`u64`]. +pub const SZ_32K_U64: u64 = SZ_32K as u64; +/// [`SZ_64K`] as a [`u64`]. +pub const SZ_64K_U64: u64 = SZ_64K as u64; +/// [`SZ_128K`] as a [`u64`]. +pub const SZ_128K_U64: u64 = SZ_128K as u64; +/// [`SZ_256K`] as a [`u64`]. +pub const SZ_256K_U64: u64 = SZ_256K as u64; +/// [`SZ_512K`] as a [`u64`]. +pub const SZ_512K_U64: u64 = SZ_512K as u64; +/// [`SZ_1M`] as a [`u64`]. +pub const SZ_1M_U64: u64 = SZ_1M as u64; +/// [`SZ_2M`] as a [`u64`]. +pub const SZ_2M_U64: u64 = SZ_2M as u64; +/// [`SZ_4M`] as a [`u64`]. +pub const SZ_4M_U64: u64 = SZ_4M as u64; +/// [`SZ_8M`] as a [`u64`]. +pub const SZ_8M_U64: u64 = SZ_8M as u64; +/// [`SZ_16M`] as a [`u64`]. +pub const SZ_16M_U64: u64 = SZ_16M as u64; +/// [`SZ_32M`] as a [`u64`]. +pub const SZ_32M_U64: u64 = SZ_32M as u64; +/// [`SZ_64M`] as a [`u64`]. +pub const SZ_64M_U64: u64 = SZ_64M as u64; +/// [`SZ_128M`] as a [`u64`]. +pub const SZ_128M_U64: u64 = SZ_128M as u64; +/// [`SZ_256M`] as a [`u64`]. +pub const SZ_256M_U64: u64 = SZ_256M as u64; +/// [`SZ_512M`] as a [`u64`]. +pub const SZ_512M_U64: u64 = SZ_512M as u64; +/// [`SZ_1G`] as a [`u64`]. +pub const SZ_1G_U64: u64 = SZ_1G as u64; +/// [`SZ_2G`] as a [`u64`]. +pub const SZ_2G_U64: u64 = SZ_2G as u64; -- 2.53.0