On Tue, 27 Feb 2024 02:25:14 -0500 Kent Overstreet <kent.overstreet@xxxxxxxxx> wrote:
> Add a __ksize() equivalent for vmalloc.
> +++ b/mm/vmalloc.c
> @@ -2848,6 +2848,26 @@ void vfree(const void *addr)
> }
> EXPORT_SYMBOL(vfree);
>
> +/**
> + * vmalloc_bytes - Return size of a vmalloc() allocation
> + * @addr: Memory base address
> + *
> + * Returns the size of the allocation as passed to vmalloc() rounded up to
> + * PAGE_SIZE; does not include extra internal allocations.
> + */
> +size_t vmalloc_bytes(const void *addr)
> +{
> + struct vm_struct *vm = find_vm_area(addr);
> + if (unlikely(!vm)) {
> + WARN(1, KERN_ERR "vmalloc_bytes() called on nonexistent vm area (%p)\n",
> + addr);
> + return 0;
if (WARN(!vm, "..."))
and I don't think the explicit KERN_ERR facility is needed?
