2 Sep
2008
2 Sep
'08
11:41 a.m.
At Tue, 2 Sep 2008 11:16:37 +0800, Cai, Cliff wrote:
@@ -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.
But without this dummy function,shared mmap on nommu arch would fail,refer to validate_mmap_request() in mm/nommu.c.
Yes, I know it's needed for nommu. That's why I wrote "unconditionally" in the above.
May be we can add a kernel config item to include or not include this function depending on non-mmu or mmu arch.
Checking CONFIG_MMU may suffice?
Takashi