Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753682Ab3CKJ7s (ORCPT ); Mon, 11 Mar 2013 05:59:48 -0400 Received: from smtp-out-220.synserver.de ([212.40.185.220]:1097 "EHLO smtp-out-220.synserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752797Ab3CKJ7r (ORCPT ); Mon, 11 Mar 2013 05:59:47 -0400 X-SynServer-TrustedSrc: 1 X-SynServer-AuthUser: lars@metafoo.de X-SynServer-PPID: 29314 Message-ID: <513DAB80.1020900@metafoo.de> Date: Mon, 11 Mar 2013 11:01:36 +0100 From: Lars-Peter Clausen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.12) Gecko/20130116 Icedove/10.0.12 MIME-Version: 1.0 To: Tim Gardner CC: linux-kernel@vger.kernel.org, Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai , device-drivers-devel@blackfin.uclinux.org, alsa-devel@alsa-project.org Subject: Re: [PATCH] ASoC: adau1373: adau1373_hw_params: Silence overflow warning References: <1362936878-84443-1-git-send-email-tim.gardner@canonical.com> In-Reply-To: <1362936878-84443-1-git-send-email-tim.gardner@canonical.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2582 Lines: 67 On 03/10/2013 06:34 PM, Tim Gardner wrote: > ADAU1373_BCLKDIV_SOURCE is defined as BIT(5) which uses UL constants. On > amd64 the result of the ones complement operator is then truncated to > unsigned int according to the prototype of snd_soc_update_bits(). I think > gcc is correctly warning that the upper 32 bits are lost. > > sound/soc/codecs/adau1373.c: In function 'adau1373_hw_params': > sound/soc/codecs/adau1373.c:940:3: warning: large integer implicitly truncated to unsigned type [-Woverflow] > > gcc version 4.6.3 > > Cc: Lars-Peter Clausen > Cc: Liam Girdwood > Cc: Mark Brown > Cc: Jaroslav Kysela > Cc: Takashi Iwai > Cc: device-drivers-devel@blackfin.uclinux.org > Cc: alsa-devel@alsa-project.org > Signed-off-by: Tim Gardner > --- > sound/soc/codecs/adau1373.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/sound/soc/codecs/adau1373.c b/sound/soc/codecs/adau1373.c > index 068b3ae..56ed788 100644 > --- a/sound/soc/codecs/adau1373.c > +++ b/sound/soc/codecs/adau1373.c > @@ -132,7 +132,7 @@ struct adau1373 { > #define ADAU1373_DAI_FORMAT_I2S 0x2 > #define ADAU1373_DAI_FORMAT_DSP 0x3 > > -#define ADAU1373_BCLKDIV_SOURCE BIT(5) > +#define ADAU1373_BCLKDIV_SOURCE (unsigned int)BIT(5) Hm, that's a bit ugly. How about the following instead: diff --git a/sound/soc/codecs/adau1373.c b/sound/soc/codecs/adau1373.c index 068b3ae..1aa10dd 100644 --- a/sound/soc/codecs/adau1373.c +++ b/sound/soc/codecs/adau1373.c @@ -133,6 +133,8 @@ struct adau1373 { #define ADAU1373_DAI_FORMAT_DSP 0x3 #define ADAU1373_BCLKDIV_SOURCE BIT(5) +#define ADAU1373_BCLKDIV_SR_MASK (0x07 << 2) +#define ADAU1373_BCLKDIV_BCLK_MASK 0x03 #define ADAU1373_BCLKDIV_32 0x03 #define ADAU1373_BCLKDIV_64 0x02 #define ADAU1373_BCLKDIV_128 0x01 @@ -937,7 +939,8 @@ static int adau1373_hw_params(struct snd_pcm_substream *substream, adau1373_dai->enable_src = (div != 0); snd_soc_update_bits(codec, ADAU1373_BCLKDIV(dai->id), - ~ADAU1373_BCLKDIV_SOURCE, (div << 2) | ADAU1373_BCLKDIV_64); + ADAU1373_BCLKDIV_SR_MASK | ADAU1373_BCLKDIV_BCLK_MASK, + (div << 2) | ADAU1373_BCLKDIV_64); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/