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hypervisor: kvm: aarch64: remove repetition in offset_of

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The repetition served no purpose.

No functional change.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu 2022-12-16 15:52:34 +00:00 committed by Rob Bradford
parent cd83d258b8
commit 3a232ef31a
1 changed files with 6 additions and 4 deletions
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10
hypervisor/src/kvm/aarch64/mod.rs
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@ -25,7 +25,7 @@ pub use {kvm_ioctls::Cap, kvm_ioctls::Kvm};
// an instance of that structure.
#[macro_export]
macro_rules! offset_of {
($str:ty, $($field:ident)+) => ({
($str:ty, $field:ident) => {{
let tmp: std::mem::MaybeUninit<$str> = std::mem::MaybeUninit::uninit();
let base = tmp.as_ptr();
@ -34,14 +34,16 @@ macro_rules! offset_of {
// SAFETY: The pointer is valid and aligned, just not initialised. Using `addr_of` ensures
// that we don't actually read from `base` (which would be UB) nor create an intermediate
// reference.
let member = unsafe { core::ptr::addr_of!((*base).$($field)*) } as *const u8;
let member = unsafe { core::ptr::addr_of!((*base).$field) } as *const u8;
// Avoid warnings when nesting `unsafe` blocks.
#[allow(unused_unsafe)]
// SAFETY: The two pointers are within the same allocated object `tmp`. All requirements
// from offset_from are upheld.
unsafe { member.offset_from(base as *const u8) as usize }
});
unsafe {
member.offset_from(base as *const u8) as usize
}
}};
}
// Following are macros that help with getting the ID of a aarch64 core register.