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mm: vmalloc: introduce array allocation functions 

Linux has dozens of occurrences of vmalloc(array_size()) and
vzalloc(array_size()).  Allow to simplify the code by providing
vmalloc_array and vcalloc, as well as the underscored variants that let
the caller specify the GFP flags.

Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-03-08 04:47:22 -05:00
parent 0564eeb71b
commit a8749a35c3
2 changed files with 55 additions and 0 deletions
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5
include/linux/vmalloc.h
View File

@ -159,6 +159,11 @@ void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask,
int node, const void *caller) __alloc_size(1);
void *vmalloc_no_huge(unsigned long size) __alloc_size(1);
extern void *__vmalloc_array(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
extern void *vmalloc_array(size_t n, size_t size) __alloc_size(1, 2);
extern void *__vcalloc(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
extern void *vcalloc(size_t n, size_t size) __alloc_size(1, 2);
extern void vfree(const void *addr);
extern void vfree_atomic(const void *addr);

50
mm/util.c
View File

@ -647,6 +647,56 @@ void *kvrealloc(const void *p, size_t oldsize, size_t newsize, gfp_t flags)
}
EXPORT_SYMBOL(kvrealloc);
/**
* __vmalloc_array - allocate memory for a virtually contiguous array.
* @n: number of elements.
* @size: element size.
* @flags: the type of memory to allocate (see kmalloc).
*/
void *__vmalloc_array(size_t n, size_t size, gfp_t flags)
{
size_t bytes;
if (unlikely(check_mul_overflow(n, size, &bytes)))
return NULL;
return __vmalloc(bytes, flags);
}
EXPORT_SYMBOL(__vmalloc_array);
/**
* vmalloc_array - allocate memory for a virtually contiguous array.
* @n: number of elements.
* @size: element size.
*/
void *vmalloc_array(size_t n, size_t size)
{
return __vmalloc_array(n, size, GFP_KERNEL);
}
EXPORT_SYMBOL(vmalloc_array);
/**
* __vcalloc - allocate and zero memory for a virtually contiguous array.
* @n: number of elements.
* @size: element size.
* @flags: the type of memory to allocate (see kmalloc).
*/
void *__vcalloc(size_t n, size_t size, gfp_t flags)
{
return __vmalloc_array(n, size, flags | __GFP_ZERO);
}
EXPORT_SYMBOL(__vcalloc);
/**
* vcalloc - allocate and zero memory for a virtually contiguous array.
* @n: number of elements.
* @size: element size.
*/
void *vcalloc(size_t n, size_t size)
{
return __vmalloc_array(n, size, GFP_KERNEL | __GFP_ZERO);
}
EXPORT_SYMBOL(vcalloc);
/* Neutral page->mapping pointer to address_space or anon_vma or other */
void *page_rmapping(struct page *page)
{