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vmm: cpu: Fix slow vector initialization

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warning: slow zero-filling initialization
    --> vmm/src/cpu.rs:1780:9
     |
1779 |         let mut mat_data: Vec<u8> = Vec::new();
     |                                     ---------- help: consider replacing this with: `vec![0; std::mem::size_of_val(&lapic)]`
1780 |         mat_data.resize(std::mem::size_of_val(&lapic), 0);
     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#slow_vector_initialization
     = note: `#[warn(clippy::slow_vector_initialization)]` on by default

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
(cherry picked from commit 0bead9ebe19b97b1e6d6587be07bc2ac57986011)
This commit is contained in:
Rob Bradford 2023-08-22 10:58:10 +01:00 committed by Bo Chen
parent 1446873b28
commit 1ed31abb5d
1 changed files with 1 additions and 2 deletions
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3
vmm/src/cpu.rs
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@ -1733,8 +1733,7 @@ impl Cpu {
flags: 1 << MADT_CPU_ENABLE_FLAG,
};
let mut mat_data: Vec<u8> = Vec::new();
mat_data.resize(std::mem::size_of_val(&lapic), 0);
let mut mat_data: Vec<u8> = vec![0; std::mem::size_of_val(&lapic)];
unsafe { *(mat_data.as_mut_ptr() as *mut LocalApic) = lapic };
mat_data