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authorJustus Winter <4winter@informatik.uni-hamburg.de>2015-05-23 07:31:17 +0200
committerJustus Winter <4winter@informatik.uni-hamburg.de>2015-05-23 17:05:58 +0200
commit417ca3833d651a89dc55462739f9dbb9f7af7866 (patch)
treea6b44dcac9d5abae76031e85febd5e2ef298b7df
parent9c6db49cc8bb097b4bf2c6a6ad331bcb58f0eca7 (diff)
vm: drop unused `kmem_realloc'
* vm/vm_kern.c (kmem_realloc): Remove function. (kmem_alloc_wired): Adopt comment. * vm/vm_kern.h (kmem_realloc): Remove declaration.
-rw-r--r--vm/vm_kern.c102
-rw-r--r--vm/vm_kern.h2
2 files changed, 1 insertions, 103 deletions
diff --git a/vm/vm_kern.c b/vm/vm_kern.c
index b997cb5..ab1ddac 100644
--- a/vm/vm_kern.c
+++ b/vm/vm_kern.c
@@ -431,113 +431,13 @@ retry:
}
/*
- * kmem_realloc:
- *
- * Reallocate wired-down memory in the kernel's address map
- * or a submap. Newly allocated pages are not zeroed.
- * This can only be used on regions allocated with kmem_alloc.
- *
- * If successful, the pages in the old region are mapped twice.
- * The old region is unchanged. Use kmem_free to get rid of it.
- */
-kern_return_t kmem_realloc(
- vm_map_t map,
- vm_offset_t oldaddr,
- vm_size_t oldsize,
- vm_offset_t *newaddrp,
- vm_size_t newsize)
-{
- vm_offset_t oldmin, oldmax;
- vm_offset_t newaddr;
- vm_object_t object;
- vm_map_entry_t oldentry, newentry;
- unsigned int attempts;
- kern_return_t kr;
-
- oldmin = trunc_page(oldaddr);
- oldmax = round_page(oldaddr + oldsize);
- oldsize = oldmax - oldmin;
- newsize = round_page(newsize);
-
- /*
- * Find space for the new region.
- */
-
- attempts = 0;
-
-retry:
- vm_map_lock(map);
- kr = vm_map_find_entry(map, &newaddr, newsize, (vm_offset_t) 0,
- VM_OBJECT_NULL, &newentry);
- if (kr != KERN_SUCCESS) {
- vm_map_unlock(map);
-
- if (attempts == 0) {
- attempts++;
- slab_collect();
- goto retry;
- }
-
- printf_once("no more room for kmem_realloc in %p\n", map);
- return kr;
- }
-
- /*
- * Find the VM object backing the old region.
- */
-
- if (!vm_map_lookup_entry(map, oldmin, &oldentry))
- panic("kmem_realloc");
- object = oldentry->object.vm_object;
-
- /*
- * Increase the size of the object and
- * fill in the new region.
- */
-
- vm_object_reference(object);
- vm_object_lock(object);
- if (object->size != oldsize)
- panic("kmem_realloc");
- object->size = newsize;
- vm_object_unlock(object);
-
- newentry->object.vm_object = object;
- newentry->offset = 0;
-
- /*
- * Since we have not given out this address yet,
- * it is safe to unlock the map. We are trusting
- * that nobody will play with either region.
- */
-
- vm_map_unlock(map);
-
- /*
- * Remap the pages in the old region and
- * allocate more pages for the new region.
- */
-
- kmem_remap_pages(object, 0,
- newaddr, newaddr + oldsize,
- VM_PROT_DEFAULT);
- kmem_alloc_pages(object, oldsize,
- newaddr + oldsize, newaddr + newsize,
- VM_PROT_DEFAULT);
-
- *newaddrp = newaddr;
- return KERN_SUCCESS;
-}
-
-/*
* kmem_alloc_wired:
*
* Allocate wired-down memory in the kernel's address map
* or a submap. The memory is not zero-filled.
*
* The memory is allocated in the kernel_object.
- * It may not be copied with vm_map_copy, and
- * it may not be reallocated with kmem_realloc.
+ * It may not be copied with vm_map_copy.
*/
kern_return_t
diff --git a/vm/vm_kern.h b/vm/vm_kern.h
index 0869217..fb8ac7f 100644
--- a/vm/vm_kern.h
+++ b/vm/vm_kern.h
@@ -54,8 +54,6 @@ extern kern_return_t kmem_alloc_pageable(vm_map_t, vm_offset_t *,
vm_size_t);
extern kern_return_t kmem_alloc_wired(vm_map_t, vm_offset_t *, vm_size_t);
extern kern_return_t kmem_alloc_aligned(vm_map_t, vm_offset_t *, vm_size_t);
-extern kern_return_t kmem_realloc(vm_map_t, vm_offset_t, vm_size_t,
- vm_offset_t *, vm_size_t);
extern void kmem_free(vm_map_t, vm_offset_t, vm_size_t);
extern void kmem_submap(vm_map_t, vm_map_t, vm_offset_t *,