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mm/vmalloc: extend __alloc_vmap_area() with extra arguments 

It implies that __alloc_vmap_area() allocates only from the global vmap
space, therefore a list-head and rb-tree, which represent a free vmap
space, are not passed as parameters to this function and are accessed
directly from this function.

Extend the __alloc_vmap_area() and other dependent functions to have a
possibility to allocate from different trees making an interface common
and not specific.

There is no functional change as a result of this patch.

Link: https://lkml.kernel.org/r/20220607093449.3100-3-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uladzislau Rezki (Sony) 2022-06-07 11:34:46 +02:00 committed by akpm
parent 8eb510db21
commit f9863be493
1 changed files with 17 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
mm/vmalloc.c
View File

@ -1233,15 +1233,15 @@ is_within_this_va(struct vmap_area *va, unsigned long size,
* overhead.
*/
static __always_inline struct vmap_area *
find_vmap_lowest_match(unsigned long size, unsigned long align,
unsigned long vstart, bool adjust_search_size)
find_vmap_lowest_match(struct rb_root *root, unsigned long size,
unsigned long align, unsigned long vstart, bool adjust_search_size)
{
struct vmap_area *va;
struct rb_node *node;
unsigned long length;
/* Start from the root. */
node = free_vmap_area_root.rb_node;
node = root->rb_node;
/* Adjust the search size for alignment overhead. */
length = adjust_search_size ? size + align - 1 : size;
@ -1369,8 +1369,9 @@ classify_va_fit_type(struct vmap_area *va,
}
static __always_inline int
adjust_va_to_fit_type(struct vmap_area *va,
unsigned long nva_start_addr, unsigned long size)
adjust_va_to_fit_type(struct rb_root *root, struct list_head *head,
struct vmap_area *va, unsigned long nva_start_addr,
unsigned long size)
{
struct vmap_area *lva = NULL;
enum fit_type type = classify_va_fit_type(va, nva_start_addr, size);
@ -1383,7 +1384,7 @@ adjust_va_to_fit_type(struct vmap_area *va,
* V NVA V
* |---------------|
*/
unlink_va_augment(va, &free_vmap_area_root);
unlink_va_augment(va, root);
kmem_cache_free(vmap_area_cachep, va);
} else if (type == LE_FIT_TYPE) {
/*
@ -1461,8 +1462,7 @@ adjust_va_to_fit_type(struct vmap_area *va,
augment_tree_propagate_from(va);
if (lva) /* type == NE_FIT_TYPE */
insert_vmap_area_augment(lva, &va->rb_node,
&free_vmap_area_root, &free_vmap_area_list);
insert_vmap_area_augment(lva, &va->rb_node, root, head);
}
return 0;
@ -1473,7 +1473,8 @@ adjust_va_to_fit_type(struct vmap_area *va,
* Otherwise a vend is returned that indicates failure.
*/
static __always_inline unsigned long
__alloc_vmap_area(unsigned long size, unsigned long align,
__alloc_vmap_area(struct rb_root *root, struct list_head *head,
unsigned long size, unsigned long align,
unsigned long vstart, unsigned long vend)
{
bool adjust_search_size = true;
@ -1493,7 +1494,7 @@ __alloc_vmap_area(unsigned long size, unsigned long align,
if (align <= PAGE_SIZE || (align > PAGE_SIZE && (vend - vstart) == size))
adjust_search_size = false;
va = find_vmap_lowest_match(size, align, vstart, adjust_search_size);
va = find_vmap_lowest_match(root, size, align, vstart, adjust_search_size);
if (unlikely(!va))
return vend;
@ -1507,7 +1508,7 @@ __alloc_vmap_area(unsigned long size, unsigned long align,
return vend;
/* Update the free vmap_area. */
ret = adjust_va_to_fit_type(va, nva_start_addr, size);
ret = adjust_va_to_fit_type(root, head, va, nva_start_addr, size);
if (WARN_ON_ONCE(ret))
return vend;
@ -1598,7 +1599,8 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
retry:
preload_this_cpu_lock(&free_vmap_area_lock, gfp_mask, node);
addr = __alloc_vmap_area(size, align, vstart, vend);
addr = __alloc_vmap_area(&free_vmap_area_root, &free_vmap_area_list,
size, align, vstart, vend);
spin_unlock(&free_vmap_area_lock);
/*
@ -3874,7 +3876,9 @@ retry:
/* It is a BUG(), but trigger recovery instead. */
goto recovery;
ret = adjust_va_to_fit_type(va, start, size);
ret = adjust_va_to_fit_type(&free_vmap_area_root,
&free_vmap_area_list,
va, start, size);
if (WARN_ON_ONCE(unlikely(ret)))
/* It is a BUG(), but trigger recovery instead. */
goto recovery;