ALSA: add dummy function to support shared mmap in nommu Blackfin arch

Cc: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 13 insertions, 0 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index df2299a8cef..e61e12506de 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -3385,6 +3385,17 @@ out:
 }
 #endif /* CONFIG_SND_SUPPORT_OLD_API */
 
+#ifndef CONFIG_MMU
+unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
+                                      unsigned long len, unsigned long pgoff,
+                                      unsigned long flags)
+{
+        return 0;
+}
+#else
+# define dummy_get_unmapped_area NULL
+#endif
+
 /*
  *  Register section
  */
@@ -3401,6 +3412,7 @@ 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,
@@ -3413,5 +3425,6 @@ 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,
         }
 };