Subject: Re: linux-next: build warning after merge of the sound-asoc tree

From: MR Swami Reddy <[email-masked]>
Date: Thu, 05 Apr 2012 20:02:42 +0530

Hi,
I tried to reproduce the below mentioned warning messages using:
 - Latest for-next git repo sources  on x86_64 build machine
 - gcc version 4.3.2
 - -Woverflow option used in KBUILD_CFLAGS

But couldn't see the warning messages.

Below is the quick patch to remove the warning messages (and this patch
will be submitted to alsa-devel mailing list soon).

Signed-off-by: M R Swami Reddy <[email-masked]>
---
 sound/soc/codecs/lm49453.c  |   13 +-
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/lm49453.c b/sound/soc/codecs/lm49453.c
index 744063d..74409ec 100644
--- a/sound/soc/codecs/lm49453.c
+++ b/sound/soc/codecs/lm49453.c
@@ -1178,27 +1178,24 @@ static int lm49453_set_dai_fmt(struct
snd_soc_dai *codec_dai, unsigned int fmt)
 {
        struct snd_soc_codec *codec = codec_dai->codec;

-       int aif_val = 0;
+       u16 aif_val;
        int mode = 0;
        int clk_phase = 0;
        int clk_shift = 0;

        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
        case SND_SOC_DAIFMT_CBS_CFS:
-               aif_val = ~LM49453_AUDIO_PORT1_BASIC_CLK_MS |
-                       ~LM49453_AUDIO_PORT1_BASIC_SYNC_MS;
+               aif_val = 0;
                break;
        case SND_SOC_DAIFMT_CBS_CFM:
-               aif_val = ~LM49453_AUDIO_PORT1_BASIC_CLK_MS |
-                       LM49453_AUDIO_PORT1_BASIC_SYNC_MS;
+               aif_val = LM49453_AUDIO_PORT1_BASIC_SYNC_MS;
                break;
        case SND_SOC_DAIFMT_CBM_CFS:
-               aif_val = LM49453_AUDIO_PORT1_BASIC_CLK_MS |
-                       ~LM49453_AUDIO_PORT1_BASIC_SYNC_MS;
+               aif_val = LM49453_AUDIO_PORT1_BASIC_CLK_MS;
                break;
        case SND_SOC_DAIFMT_CBM_CFM:
                aif_val = LM49453_AUDIO_PORT1_BASIC_CLK_MS |
-                       LM49453_AUDIO_PORT1_BASIC_SYNC_MS;
+                         LM49453_AUDIO_PORT1_BASIC_SYNC_MS;
                break;
        default:
                return -EINVAL;

On Thursday 05 April 2012 06:33 AM, Stephen Rothwell wrote:
> Hi all,
>
> After merging the sound-asoc tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
>
> sound/soc/codecs/lm49453.c: In function 'lm49453_set_dai_fmt':
> sound/soc/codecs/lm49453.c:1189:4: warning: overflow in implicit constant conversion [-Woverflow]
> sound/soc/codecs/lm49453.c:1193:4: warning: overflow in implicit constant conversion [-Woverflow]
> sound/soc/codecs/lm49453.c:1197:4: warning: overflow in implicit constant conversion [-Woverflow]
>
> Introduced by commit dbf7a733f5fb (ASoC: Support TI LM49453 Audio driver"").