Re: 2.6.15-rc1-mm2 -- Bad page state at free_hot_cold_page (inprocess 'aplay', page c18eef30)

[Lee Revell]

(Added alsa-devel to cc:)

Will this change have any ill effects on older kernels?  If not we
should fix it in the ALSA tree right?

Lee

On Sun, 2005-11-20 at 08:05 +0000, Hugh Dickins wrote:
> On Sat, 19 Nov 2005, Miles Lane wrote:
> > [17179671.700000] Bad page state at free_hot_cold_page (in process
> > 'aplay', page c18eef30)
> > [17179671.700000] flags:0x80000414 mapping:00000000 mapcount:0 count:0
> 
> Please let me know if it's not fixed by:
> 
> --- 2.6.15-rc1-mm2/sound/core/memalloc.c	2005-11-12 09:01:28.000000000 +0000
> +++ linux/sound/core/memalloc.c	2005-11-19 19:03:32.000000000 +0000
> @@ -197,6 +197,7 @@ void *snd_malloc_pages(size_t size, gfp_
>  
>  	snd_assert(size > 0, return NULL);
>  	snd_assert(gfp_flags != 0, return NULL);
> +	gfp_flags |= __GFP_COMP;	/* compound page lets parts be mapped */
>  	pg = get_order(size);
>  	if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) {
>  		mark_pages(virt_to_page(res), pg);
> @@ -241,6 +242,7 @@ static void *snd_malloc_dev_pages(struct
>  	snd_assert(dma != NULL, return NULL);
>  	pg = get_order(size);
>  	gfp_flags = GFP_KERNEL
> +		| __GFP_COMP	/* compound page lets parts be mapped */
>  		| __GFP_NORETRY /* don't trigger OOM-killer */
>  		| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
>  	res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
> -
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