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Linux/rust/kernel/alloc/allocator.rs

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Diff markup

Differences between /rust/kernel/alloc/allocator.rs (Version linux-6.12-rc7) and /rust/kernel/alloc/allocator.rs (Version linux-4.19.323)


  1 // SPDX-License-Identifier: GPL-2.0               
  2                                                   
  3 //! Allocator support.                            
  4                                                   
  5 use super::{flags::*, Flags};                     
  6 use core::alloc::{GlobalAlloc, Layout};           
  7 use core::ptr;                                    
  8                                                   
  9 struct KernelAllocator;                           
 10                                                   
 11 /// Calls `krealloc` with a proper size to all    
 12 ///                                               
 13 /// # Safety                                      
 14 ///                                               
 15 /// - `ptr` can be either null or a pointer wh    
 16 /// - `new_layout` must have a non-zero size.     
 17 pub(crate) unsafe fn krealloc_aligned(ptr: *mu    
 18     // Customized layouts from `Layout::from_s    
 19     let layout = new_layout.pad_to_align();       
 20                                                   
 21     // Note that `layout.size()` (after paddin    
 22     // which together with the slab guarantees    
 23     // object (see comments in `kmalloc()` for    
 24     let size = layout.size();                     
 25                                                   
 26     // SAFETY:                                    
 27     // - `ptr` is either null or a pointer ret    
 28     //   function safety requirement.             
 29     // - `size` is greater than 0 since it's f    
 30     //   to the function safety requirement)      
 31     unsafe { bindings::krealloc(ptr as *const     
 32 }                                                 
 33                                                   
 34 unsafe impl GlobalAlloc for KernelAllocator {     
 35     unsafe fn alloc(&self, layout: Layout) ->     
 36         // SAFETY: `ptr::null_mut()` is null a    
 37         // requirement.                           
 38         unsafe { krealloc_aligned(ptr::null_mu    
 39     }                                             
 40                                                   
 41     unsafe fn dealloc(&self, ptr: *mut u8, _la    
 42         unsafe {                                  
 43             bindings::kfree(ptr as *const core    
 44         }                                         
 45     }                                             
 46                                                   
 47     unsafe fn realloc(&self, ptr: *mut u8, lay    
 48         // SAFETY:                                
 49         // - `new_size`, when rounded up to th    
 50         //   overflow `isize` by the function     
 51         // - `layout.align()` is a proper alig    
 52         let layout = unsafe { Layout::from_siz    
 53                                                   
 54         // SAFETY:                                
 55         // - `ptr` is either null or a pointer    
 56         //   requirement.                         
 57         // - the size of `layout` is not zero     
 58         //   requirement.                         
 59         unsafe { krealloc_aligned(ptr, layout,    
 60     }                                             
 61                                                   
 62     unsafe fn alloc_zeroed(&self, layout: Layo    
 63         // SAFETY: `ptr::null_mut()` is null a    
 64         // requirement.                           
 65         unsafe { krealloc_aligned(ptr::null_mu    
 66     }                                             
 67 }                                                 
 68                                                   
 69 #[global_allocator]                               
 70 static ALLOCATOR: KernelAllocator = KernelAllo    
 71                                                   
 72 // See <https://github.com/rust-lang/rust/pull    
 73 #[no_mangle]                                      
 74 static __rust_no_alloc_shim_is_unstable: u8 =     
                                                      

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