These are all boolean variables so the result is the same except that
maybe | and & are faster than || and && because they don't have the
same ordering requirements?
regards,
dan carpenter
On Wed, Mar 05, 2014 at 07:40:53AM +0800, kbuild test robot wrote:
> TO: Mauro Carvalho Chehab <m.che...@samsung.com>
> CC: linux-me...@vger.kernel.org
>
>
> Hi Mauro,
>
> FYI, there are new sparse warnings show up in
>
> tree: git://linuxtv.org/media_tree.git master
> head: 59432be1c7fbf2a4f608850855ff649bee0f7b3b
> commit: 259f380e6828c1dd324d43b16c0c95d34f33b4aa [441/499] [media] drx-j:
> Simplify logic expressions
> reproduce: make C=1 CF=-D__CHECK_ENDIAN__
> :::::: branch date: 6 hours ago
> :::::: commit date: 6 hours ago
>
> drivers/media/dvb-frontends/drx39xyj/drxj.c:593:6: sparse: symbol
> 'drx_dap_drxj_module_name' was not declared. Should it be static?
> drivers/media/dvb-frontends/drx39xyj/drxj.c:594:6: sparse: symbol
> 'drx_dap_drxj_version_text' was not declared. Should it be static?
> drivers/media/dvb-frontends/drx39xyj/drxj.c:596:20: sparse: symbol
> 'drx_dap_drxj_version' was not declared. Should it be static?
> drivers/media/dvb-frontends/drx39xyj/drxj.c:981:21: sparse: symbol
> 'drxj_default_aud_data_g' was not declared. Should it be static?
> >> drivers/media/dvb-frontends/drx39xyj/drxj.c:16798:68: sparse: dubious: x &
> >> !y
> >> drivers/media/dvb-frontends/drx39xyj/drxj.c:16816:68: sparse: dubious: x &
> >> !y
> >> drivers/media/dvb-frontends/drx39xyj/drxj.c:16835:68: sparse: dubious: x &
> >> !y
> drivers/media/dvb-frontends/drx39xyj/drxj.c:14053:27: sparse: cast
> truncates bits from constant value (ffff00ff becomes ff)
> drivers/media/dvb-frontends/drx39xyj/drxj.c:14078:24: sparse: cast
> truncates bits from constant value (ffff3fff becomes 3fff)
> drivers/media/dvb-frontends/drx39xyj/drxj.c:15145:31: sparse: cast
> truncates bits from constant value (ffff00ff becomes ff)
> drivers/media/dvb-frontends/drx39xyj/drxj.c:15195:26: sparse: cast
> truncates bits from constant value (ffff0000 becomes 0)
> drivers/media/dvb-frontends/drx39xyj/drxj.c:15273:33: sparse: cast
> truncates bits from constant value (ffff7fff becomes 7fff)
> drivers/media/dvb-frontends/drx39xyj/drxj.c:15900:26: sparse: cast
> truncates bits from constant value (ffff7fff becomes 7fff)
>
> git remote add linuxtv-media git://linuxtv.org/media_tree.git
> git remote update linuxtv-media
> git checkout 259f380e6828c1dd324d43b16c0c95d34f33b4aa
> vim +16798 drivers/media/dvb-frontends/drx39xyj/drxj.c
>
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16792 scu_cmd.parameter_len =
> 3;
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16793 /* 1-data
> rate;2-frequency */
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16794 switch
> (oob_param->standard) {
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16795 case DRX_OOB_MODE_A:
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16796 if (
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16797 /*
> signal is transmitted inverted */
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 @16798
> ((oob_param->spectrum_inverted == true) &
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16799 /*
> and tuner is not mirroring the signal */
> 259f380e Mauro Carvalho Chehab 2014-01-17 16800
> (!mirror_freq_spectOOB)) |
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16801 /*
> or */
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16802 /*
> signal is transmitted noninverted */
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16803
> ((oob_param->spectrum_inverted == false) &
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16804 /*
> and tuner is mirroring the signal */
> 259f380e Mauro Carvalho Chehab 2014-01-17 16805
> (mirror_freq_spectOOB))
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16806 )
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16807
> set_param_parameters[0] =
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16808
> SCU_RAM_ORX_RF_RX_DATA_RATE_2048KBPS_INVSPEC;
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16809 else
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16810
> set_param_parameters[0] =
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16811
> SCU_RAM_ORX_RF_RX_DATA_RATE_2048KBPS_REGSPEC;
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16812 break;
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16813 case
> DRX_OOB_MODE_B_GRADE_A:
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16814 if (
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16815 /*
> signal is transmitted inverted */
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 @16816
> ((oob_param->spectrum_inverted == true) &
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16817 /*
> and tuner is not mirroring the signal */
> 259f380e Mauro Carvalho Chehab 2014-01-17 16818
> (!mirror_freq_spectOOB)) |
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16819 /*
> or */
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16820 /*
> signal is transmitted noninverted */
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16821
> ((oob_param->spectrum_inverted == false) &
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16822 /*
> and tuner is mirroring the signal */
> 259f380e Mauro Carvalho Chehab 2014-01-17 16823
> (mirror_freq_spectOOB))
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16824 )
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16825
> set_param_parameters[0] =
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16826
> SCU_RAM_ORX_RF_RX_DATA_RATE_1544KBPS_INVSPEC;
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16827 else
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 16828
> set_param_parameters[0] =
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16829
> SCU_RAM_ORX_RF_RX_DATA_RATE_1544KBPS_REGSPEC;
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16830 break;
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16831 case
> DRX_OOB_MODE_B_GRADE_B:
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16832 default:
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16833 if (
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16834 /*
> signal is transmitted inverted */
> 57afe2f0 Mauro Carvalho Chehab 2014-01-16 @16835
> ((oob_param->spectrum_inverted == true) &
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16836 /*
> and tuner is not mirroring the signal */
> 259f380e Mauro Carvalho Chehab 2014-01-17 16837
> (!mirror_freq_spectOOB)) |
> 443f18d0 Mauro Carvalho Chehab 2012-03-20 16838 /*
> or */
>
> :::::: The code at line 16798 was first introduced by commit
> :::::: 57afe2f0bb0cca758701679f141c9fa92a034415 [media] drx-j: Don't use
> CamelCase
>
> :::::: TO: Mauro Carvalho Chehab <m.che...@samsung.com>
> :::::: CC: Mauro Carvalho Chehab <m.che...@samsung.com>
>
> ---
> 0-DAY kernel build testing backend Open Source Technology Center
> http://lists.01.org/mailman/listinfo/kbuild Intel Corporation
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