Re: [PATCH v3 2/6] powerpc/vmemmap: Reshuffle vmemmap_free()

[Balbir Singh <bsingharora@gmail.com>]

On Fri, 23 Jun 2017 18:31:18 +1000
Oliver O'Halloran <oohall@gmail.com> wrote:

> Removes an indentation level and shuffles some code around to make the
> following patch cleaner. No functional changes.
> 
> Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
> ---
> v1 -> v2: Remove broken initialiser
> ---
>  arch/powerpc/mm/init_64.c | 48 ++++++++++++++++++++++++-----------------------
>  1 file changed, 25 insertions(+), 23 deletions(-)
> 
> diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
> index ec84b31c6c86..8851e4f5dbab 100644
> --- a/arch/powerpc/mm/init_64.c
> +++ b/arch/powerpc/mm/init_64.c
> @@ -234,13 +234,15 @@ static unsigned long vmemmap_list_free(unsigned long start)
>  void __ref vmemmap_free(unsigned long start, unsigned long end)
>  {
>  	unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
> +	unsigned long page_order = get_order(page_size);
>  
>  	start = _ALIGN_DOWN(start, page_size);
>  
>  	pr_debug("vmemmap_free %lx...%lx\n", start, end);
>  
>  	for (; start < end; start += page_size) {
> -		unsigned long addr;
> +		unsigned long nr_pages, addr;
> +		struct page *page;
>  
>  		/*
>  		 * the section has already be marked as invalid, so
> @@ -251,29 +253,29 @@ void __ref vmemmap_free(unsigned long start, unsigned long end)
>  			continue;
>  
>  		addr = vmemmap_list_free(start);
> -		if (addr) {
> -			struct page *page = pfn_to_page(addr >> PAGE_SHIFT);
> -
> -			if (PageReserved(page)) {
> -				/* allocated from bootmem */
> -				if (page_size < PAGE_SIZE) {
> -					/*
> -					 * this shouldn't happen, but if it is
> -					 * the case, leave the memory there
> -					 */
> -					WARN_ON_ONCE(1);
> -				} else {
> -					unsigned int nr_pages =
> -						1 << get_order(page_size);
> -					while (nr_pages--)
> -						free_reserved_page(page++);
> -				}
> -			} else
> -				free_pages((unsigned long)(__va(addr)),
> -							get_order(page_size));
> -
> -			vmemmap_remove_mapping(start, page_size);
> +		if (!addr)
> +			continue;
> +
> +		page = pfn_to_page(addr >> PAGE_SHIFT);
> +		nr_pages = 1 << page_order;
> +
> +		if (PageReserved(page)) {
> +			/* allocated from bootmem */
> +			if (page_size < PAGE_SIZE) {
> +				/*
> +				 * this shouldn't happen, but if it is
> +				 * the case, leave the memory there
> +				 */
> +				WARN_ON_ONCE(1);
> +			} else {
> +				while (nr_pages--)
> +					free_reserved_page(page++);
> +			}
> +		} else {
> +			free_pages((unsigned long)(__va(addr)), page_order);
>  		}
> +
> +		vmemmap_remove_mapping(start, page_size);
>  	}
>  }
>  #endif

Reviewed-by: Balbir Singh <bsingharora@gmail.com>

Balbir Singh.