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rust: alloc: introduce allocation flags

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We'll use them when allocating `Box`, `Arc`, and `UniqueArc` instances,
as well as when allocating memory for `Vec` elements. These changes will
come in subsequent patches.

Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Link: https://lore.kernel.org/r/20240328013603.206764-6-wedsonaf@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Wedson Almeida Filho
2024-03-27 22:35:58 -03:00
committed by Miguel Ojeda
parent 9d0441bab7
commit b6a006e21b
4 changed files with 71 additions and 12 deletions
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rust/kernel/alloc/allocator.rs
+6 -11
View File
@@ -2,6 +2,7 @@
//! Allocator support.
use super::{flags::*, Flags};
use core::alloc::{GlobalAlloc, Layout};
use core::ptr;
@@ -15,7 +16,7 @@ struct KernelAllocator;
///
/// - `ptr` can be either null or a pointer which has been allocated by this allocator.
/// - `new_layout` must have a non-zero size.
unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: bindings::gfp_t) -> *mut u8 {
unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: Flags) -> *mut u8 {
// Customized layouts from `Layout::from_size_align()` can have size < align, so pad first.
let layout = new_layout.pad_to_align();
@@ -36,14 +37,14 @@ unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: bindings::gf
// function safety requirement.
// - `size` is greater than 0 since it's either a `layout.size()` (which cannot be zero
// according to the function safety requirement) or a result from `next_power_of_two()`.
unsafe { bindings::krealloc(ptr as *const core::ffi::c_void, size, flags) as *mut u8 }
unsafe { bindings::krealloc(ptr as *const core::ffi::c_void, size, flags.0) as *mut u8 }
}
unsafe impl GlobalAlloc for KernelAllocator {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
// SAFETY: `ptr::null_mut()` is null and `layout` has a non-zero size by the function safety
// requirement.
unsafe { krealloc_aligned(ptr::null_mut(), layout, bindings::GFP_KERNEL) }
unsafe { krealloc_aligned(ptr::null_mut(), layout, GFP_KERNEL) }
}
unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
@@ -64,19 +65,13 @@ unsafe impl GlobalAlloc for KernelAllocator {
// requirement.
// - the size of `layout` is not zero because `new_size` is not zero by the function safety
// requirement.
unsafe { krealloc_aligned(ptr, layout, bindings::GFP_KERNEL) }
unsafe { krealloc_aligned(ptr, layout, GFP_KERNEL) }
}
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
// SAFETY: `ptr::null_mut()` is null and `layout` has a non-zero size by the function safety
// requirement.
unsafe {
krealloc_aligned(
ptr::null_mut(),
layout,
bindings::GFP_KERNEL | bindings::__GFP_ZERO,
)
}
unsafe { krealloc_aligned(ptr::null_mut(), layout, GFP_KERNEL | __GFP_ZERO) }
}
}