Re: [PATCH] mm/memblock: check memblock_reserve on fail in memblock_virt_alloc_internal

[Andrew Morton]

On Sun, 16 Aug 2015 00:26:46 +0600 Alexander Kuleshov <kuleshovmail@xxxxxxxxx> wrote:

> This patch adds a check for memblock_reserve() call in the
> memblock_virt_alloc_internal() function, because memblock_reserve()
> can return -errno on fail.
> 
> ...
>
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -1298,7 +1298,9 @@ again:
>  
>  	return NULL;
>  done:
> -	memblock_reserve(alloc, size);
> +	if (memblock_reserve(alloc, size))
> +		return NULL;
> +
>  	ptr = phys_to_virt(alloc);
>  	memset(ptr, 0, size);

This shouldn't ever happen.  If it *does* happen, something is messed
up and we should warn.  

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