ALSA: compress: fix the struct alignment to 4 bytes

In 64bit systems the compiler can default align to 8bytes causing mis-match with
32bit usermode. Avoid this is future by ensuring all the structures shared with
usermode are packed and aligned to 4 bytes irrespective of arch used

[coding style fixes by tiwai]

Signed-off-by: Vinod Koul <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

include/uapi/sound/compress_offload.h

···
 struct snd_compressed_buffer {
 	__u32 fragment_size;
 	__u32 fragments;
-};
+} __attribute__((packed, aligned(4)));
 
 /**
  * struct snd_compr_params: compressed stream params
···
 	struct snd_compressed_buffer buffer;
 	struct snd_codec codec;
 	__u8 no_wake_mode;
-};
+} __attribute__((packed, aligned(4)));
 
 /**
  * struct snd_compr_tstamp: timestamp descriptor
···
 	__u32 pcm_frames;
 	__u32 pcm_io_frames;
 	__u32 sampling_rate;
-};
+} __attribute__((packed, aligned(4)));
 
 /**
  * struct snd_compr_avail: avail descriptor
···
 struct snd_compr_avail {
 	__u64 avail;
 	struct snd_compr_tstamp tstamp;
-} __attribute__((packed));
+} __attribute__((packed, aligned(4)));
 
 enum snd_compr_direction {
 	SND_COMPRESS_PLAYBACK = 0,
···
 	__u32 max_fragments;
 	__u32 codecs[MAX_NUM_CODECS];
 	__u32 reserved[11];
-};
+} __attribute__((packed, aligned(4)));
 
 /**
  * struct snd_compr_codec_caps: query capability of codec
···
 	__u32 codec;
 	__u32 num_descriptors;
 	struct snd_codec_desc descriptor[MAX_NUM_CODEC_DESCRIPTORS];
-};
+} __attribute__((packed, aligned(4)));
 
 /**
  * @SNDRV_COMPRESS_ENCODER_PADDING: no of samples appended by the encoder at the
···
 struct snd_compr_metadata {
 	 __u32 key;
 	 __u32 value[8];
-};
+} __attribute__((packed, aligned(4)));
 
 /**
  * compress path ioctl definitions

include/uapi/sound/compress_params.h

···
 	__u32 max_bit_rate;
 	__u32 min_bit_rate;
 	__u32 downmix;
-};
+} __attribute__((packed, aligned(4)));
 
 
 /**
···
 	__u32 quant_bits;
 	__u32 start_region;
 	__u32 num_regions;
-};
+} __attribute__((packed, aligned(4)));
 
 /**
  * struct snd_enc_flac
···
 struct snd_enc_flac {
 	__u32 num;
 	__u32 gain;
-};
+} __attribute__((packed, aligned(4)));
 
 struct snd_enc_generic {
 	__u32 bw;	/* encoder bandwidth */
 	__s32 reserved[15];
-};
+} __attribute__((packed, aligned(4)));
 
 union snd_codec_options {
 	struct snd_enc_wma wma;
···
 	struct snd_enc_real real;
 	struct snd_enc_flac flac;
 	struct snd_enc_generic generic;
-};
+} __attribute__((packed, aligned(4)));
 
 /** struct snd_codec_desc - description of codec capabilities
  * @max_ch: Maximum number of audio channels
···
 	__u32 formats;
 	__u32 min_buffer;
 	__u32 reserved[15];
-};
+} __attribute__((packed, aligned(4)));
 
 /** struct snd_codec
  * @id: Identifies the supported audio encoder/decoder.
···
 	__u32 align;
 	union snd_codec_options options;
 	__u32 reserved[3];
-};
+} __attribute__((packed, aligned(4)));
 
 #endif