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Date:   Wed, 6 Jul 2022 18:53:48 +0800
From:   kernel test robot <lkp@intel.com>
To:     Zhongjun Tan <hbut_tan@163.com>, perex@perex.cz, tiwai@suse.com
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        Zhongjun Tan <tanzhongjun@coolpad.com>
Subject: Re: [PATCH] ALSA: usb-audio: Fix unsigned expression compared with
 zero
Message-ID: <202207061810.ztYTpLH7-lkp@intel.com>
References: <20220706070627.16764-1-hbut_tan@163.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20220706070627.16764-1-hbut_tan@163.com>
Precedence: bulk

Hi Zhongjun,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tiwai-sound/for-next]
[also build test WARNING on linus/master v5.19-rc5 next-20220705]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhongjun-Tan/ALSA-usb-audio-Fix-unsigned-expression-compared-with-zero/20220706-150825
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
config: hexagon-randconfig-r045-20220703 (https://download.01.org/0day-ci/archive/20220706/202207061810.ztYTpLH7-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project f553287b588916de09c66e3e32bf75e5060f967f)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/10d09dc3ad3a9b823d9097a68058698be90c7a74
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zhongjun-Tan/ALSA-usb-audio-Fix-unsigned-expression-compared-with-zero/20220706-150825
        git checkout 10d09dc3ad3a9b823d9097a68058698be90c7a74
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash sound/usb/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> sound/usb/pcm.c:782:11: warning: comparison of distinct pointer types ('typeof (rmin) *' (aka 'unsigned int *') and 'typeof (r) *' (aka 'int *')) [-Wcompare-distinct-pointer-types]
                           rmin = min(rmin, r);
                                  ^~~~~~~~~~~~
   include/linux/minmax.h:45:19: note: expanded from macro 'min'
   #define min(x, y)       __careful_cmp(x, y, <)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
>> sound/usb/pcm.c:783:11: warning: comparison of distinct pointer types ('typeof (rmax) *' (aka 'unsigned int *') and 'typeof (r) *' (aka 'int *')) [-Wcompare-distinct-pointer-types]
                           rmax = max(rmax, r);
                                  ^~~~~~~~~~~~
   include/linux/minmax.h:52:19: note: expanded from macro 'max'
   #define max(x, y)       __careful_cmp(x, y, >)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   sound/usb/pcm.c:791:12: warning: comparison of distinct pointer types ('typeof (rmin) *' (aka 'unsigned int *') and 'typeof (r) *' (aka 'int *')) [-Wcompare-distinct-pointer-types]
                                   rmin = min(rmin, r);
                                          ^~~~~~~~~~~~
   include/linux/minmax.h:45:19: note: expanded from macro 'min'
   #define min(x, y)       __careful_cmp(x, y, <)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   sound/usb/pcm.c:792:12: warning: comparison of distinct pointer types ('typeof (rmax) *' (aka 'unsigned int *') and 'typeof (r) *' (aka 'int *')) [-Wcompare-distinct-pointer-types]
                                   rmax = max(rmax, r);
                                          ^~~~~~~~~~~~
   include/linux/minmax.h:52:19: note: expanded from macro 'max'
   #define max(x, y)       __careful_cmp(x, y, >)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   4 warnings generated.


vim +782 sound/usb/pcm.c

7726dce14c5e7e Takashi Iwai 2020-11-23  761  
e5779998bf8b70 Daniel Mack  2010-03-04  762  static int hw_rule_rate(struct snd_pcm_hw_params *params,
e5779998bf8b70 Daniel Mack  2010-03-04  763  			struct snd_pcm_hw_rule *rule)
e5779998bf8b70 Daniel Mack  2010-03-04  764  {
e5779998bf8b70 Daniel Mack  2010-03-04  765  	struct snd_usb_substream *subs = rule->private;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  766  	struct snd_usb_audio *chip = subs->stream->chip;
cab941b7e5cf05 Takashi Iwai 2020-11-23  767  	const struct audioformat *fp;
e5779998bf8b70 Daniel Mack  2010-03-04  768  	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
10d09dc3ad3a9b Zhongjun Tan 2022-07-06  769  	unsigned int rmin, rmax;
10d09dc3ad3a9b Zhongjun Tan 2022-07-06  770  	int i, r;
e5779998bf8b70 Daniel Mack  2010-03-04  771  
e5779998bf8b70 Daniel Mack  2010-03-04  772  	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  773  	rmin = UINT_MAX;
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  774  	rmax = 0;
88766f04c4142c Eldad Zack   2013-04-03  775  	list_for_each_entry(fp, &subs->fmt_list, list) {
e5779998bf8b70 Daniel Mack  2010-03-04  776  		if (!hw_check_valid_format(subs, params, fp))
e5779998bf8b70 Daniel Mack  2010-03-04  777  			continue;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  778  		r = snd_usb_endpoint_get_clock_rate(chip, fp->clock);
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  779  		if (r > 0) {
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  780  			if (!snd_interval_test(it, r))
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  781  				continue;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29 @782  			rmin = min(rmin, r);
4e7cf1fbb34ecb Takashi Iwai 2021-09-29 @783  			rmax = max(rmax, r);
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  784  			continue;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  785  		}
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  786  		if (fp->rate_table && fp->nr_rates) {
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  787  			for (i = 0; i < fp->nr_rates; i++) {
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  788  				r = fp->rate_table[i];
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  789  				if (!snd_interval_test(it, r))
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  790  					continue;
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  791  				rmin = min(rmin, r);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  792  				rmax = max(rmax, r);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  793  			}
e5779998bf8b70 Daniel Mack  2010-03-04  794  		} else {
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  795  			rmin = min(rmin, fp->rate_min);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  796  			rmax = max(rmax, fp->rate_max);
e5779998bf8b70 Daniel Mack  2010-03-04  797  		}
e5779998bf8b70 Daniel Mack  2010-03-04  798  	}
e5779998bf8b70 Daniel Mack  2010-03-04  799  
7726dce14c5e7e Takashi Iwai 2020-11-23  800  	return apply_hw_params_minmax(it, rmin, rmax);
e5779998bf8b70 Daniel Mack  2010-03-04  801  }
e5779998bf8b70 Daniel Mack  2010-03-04  802  

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