Messages in this thread |  | | | Date | Thu, 28 Aug 2008 14:44:32 +0200 | | From | Takashi Iwai <> | | Subject | Re: [PATCH 4/4] ALSA: add dummy function to support shared mmap in nommu Blackfin arch |
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At Wed, 27 Aug 2008 17:39:28 +0800, Bryan Wu wrote: > > From: Cliff Cai <cliff.cai@analog.com> > > Signed-off-by: Cliff Cai <cliff.cai@analog.com> > Signed-off-by: Bryan Wu <cooloney@kernel.org> > --- > sound/core/pcm_native.c | 8 ++++++++ > 1 files changed, 8 insertions(+), 0 deletions(-) > > diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c > index c49b9d9..cb202a1 100644 > --- a/sound/core/pcm_native.c > +++ b/sound/core/pcm_native.c > @@ -3391,6 +3391,12 @@ out: > } > #endif /* CONFIG_SND_SUPPORT_OLD_API */ > > +unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr, > + unsigned long len, unsigned long pgoff, unsigned long flags) > +{ > + return 0; > +}
Always zero is confirmed to work for other architectures, too?
> /* > * Register section > */ > @@ -3407,6 +3413,7 @@ const struct file_operations snd_pcm_f_ops[2] = { > .compat_ioctl = snd_pcm_ioctl_compat, > .mmap = snd_pcm_mmap, > .fasync = snd_pcm_fasync, > + .get_unmapped_area = dummy_get_unmapped_area, > }, > { > .owner = THIS_MODULE, > @@ -3419,5 +3426,6 @@ const struct file_operations snd_pcm_f_ops[2] = { > .compat_ioctl = snd_pcm_ioctl_compat, > .mmap = snd_pcm_mmap, > .fasync = snd_pcm_fasync, > + .get_unmapped_area = dummy_get_unmapped_area, > } > };
I don't think adding this dummy get_unmapped_area unconditionally for every driver is good. This overrides the default mm->get_unmaped_area.
Takashi
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