diff options
Diffstat (limited to 'rust/kernel/alloc.rs')
| -rw-r--r-- | rust/kernel/alloc.rs | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs index 531b5e471cb1..1966bd407017 100644 --- a/rust/kernel/alloc.rs +++ b/rust/kernel/alloc.rs @@ -20,6 +20,13 @@ pub struct AllocError; #[derive(Clone, Copy)] pub struct Flags(u32); +impl Flags { + /// Get the raw representation of this flag. + pub(crate) fn as_raw(self) -> u32 { + self.0 + } +} + impl core::ops::BitOr for Flags { type Output = Self; fn bitor(self, rhs: Self) -> Self::Output { @@ -52,6 +59,14 @@ pub mod flags { /// This is normally or'd with other flags. pub const __GFP_ZERO: Flags = Flags(bindings::__GFP_ZERO); + /// Allow the allocation to be in high memory. + /// + /// Allocations in high memory may not be mapped into the kernel's address space, so this can't + /// be used with `kmalloc` and other similar methods. + /// + /// This is normally or'd with other flags. + pub const __GFP_HIGHMEM: Flags = Flags(bindings::__GFP_HIGHMEM); + /// Users can not sleep and need the allocation to succeed. /// /// A lower watermark is applied to allow access to "atomic reserves". The current @@ -66,7 +81,7 @@ pub mod flags { /// The same as [`GFP_KERNEL`], except the allocation is accounted to kmemcg. pub const GFP_KERNEL_ACCOUNT: Flags = Flags(bindings::GFP_KERNEL_ACCOUNT); - /// Ror kernel allocations that should not stall for direct reclaim, start physical IO or + /// For kernel allocations that should not stall for direct reclaim, start physical IO or /// use any filesystem callback. It is very likely to fail to allocate memory, even for very /// small allocations. pub const GFP_NOWAIT: Flags = Flags(bindings::GFP_NOWAIT); |