On Fri, 9 Dec 2005, Jacek Luczak wrote:
>
> I'm using now 2.6.15-rc5 kernel with latest Alsa 1.0.10 and I received a lot
> of 'bad page state at free_hot_cold_page' (see example below) messages. Is
> this kernel or alsa error?
>
> System:
> Slackware Linux, GCC 3.4.4, Binutils 2.16.1.
> CPU: Pentium 4 3Ghz HT
> Sound card: CMI9880 (HDA)
>
> Dec 9 16:53:20 slawek kernel: Bad page state at free_hot_cold_page (in
> process 'xmms', page c12da9c0)
> Dec 9 16:53:20 slawek kernel: flags:0x80000414 mapping:00000000 mapcount:0
> count:0
I think that means you have a mismatch: that you're using core/memalloc.c
from alsa-driver-1.0.10/alsa-kernel rather than from 2.6.15-rc5/sound.
Applying the update below should eliminate your "Bad page state"s:
I've no idea whether there are other mismatches, quite possibly not.
Hugh
--- alsa-driver-1.0.10/alsa-kernel/core/memalloc.c 2005-10-31 13:11:53.000000000 +0000
+++ 2.6.15-rc5/sound/core/memalloc.c 2005-12-04 06:48:20.000000000 +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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