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ALSA: pcm - Call pgprot_noncached() for vmalloc'ed buffers

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pgprot_noncached() can be set for vmalloc'ed buffers safely, and we'd
need non-cached behavior more or less, even for the intermediate ring-
buffers.

Now snd_pcm_lib_mmap_vmalloc() is added as the common PCM mmap callback
that is coupled with snd_pcm_lib_alloc_vmalloc_buffer() & co.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2010-01-18 14:58:57 +01:00
parent 3e879d7bac
commit c32d977b81
7 changed files with 23 additions and 0 deletions
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9
sound/core/pcm_native.c
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@@ -3176,6 +3176,15 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
#endif /* SNDRV_PCM_INFO_MMAP */
/* mmap callback with pgprot_noncached */
int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
struct vm_area_struct *area)
{
area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
return snd_pcm_default_mmap(substream, area);
}
EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
/*
* mmap DMA buffer
*/