linux-kernel - sound/core/control.c:390:11: sparse: sparse: incorrect type in assignment (different base types)

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Date:   Thu, 11 Aug 2022 05:23:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: sound/core/control.c:390:11: sparse: sparse: incorrect type in
 assignment (different base types)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f41445645ab5d172e6090d00c332c335d8dba337
commit: c27e1efb61c545f36c450ef60862df9251d239a4 ALSA: control: Use xarray for faster lookups
date:   8 weeks ago
config: i386-randconfig-s001 (https://download.01.org/0day-ci/archive/20220811/202208110507.pZ5Q9mMb-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c27e1efb61c545f36c450ef60862df9251d239a4
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout c27e1efb61c545f36c450ef60862df9251d239a4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash sound/core/

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

sparse warnings: (new ones prefixed by >>)
>> sound/core/control.c:390:11: sparse: sparse: incorrect type in assignment (different base types) @@     expected unsigned long h @@     got restricted snd_ctl_elem_iface_t const [usertype] iface @@
   sound/core/control.c:390:11: sparse:     expected unsigned long h
   sound/core/control.c:390:11: sparse:     got restricted snd_ctl_elem_iface_t const [usertype] iface
   sound/core/control.c:926:17: sparse: sparse: restricted snd_ctl_elem_type_t degrades to integer
   sound/core/control.c:926:26: sparse: sparse: restricted snd_ctl_elem_type_t degrades to integer
   sound/core/control.c:927:17: sparse: sparse: restricted snd_ctl_elem_type_t degrades to integer
   sound/core/control.c:927:26: sparse: sparse: restricted snd_ctl_elem_type_t degrades to integer
   sound/core/control.c:946:48: sparse: sparse: restricted snd_ctl_elem_type_t degrades to integer
   sound/core/control.c:1640:40: sparse: sparse: restricted snd_ctl_elem_type_t degrades to integer

vim +390 sound/core/control.c

   378	
   379	#ifdef CONFIG_SND_CTL_FAST_LOOKUP
   380	/* Compute a hash key for the corresponding ctl id
   381	 * It's for the name lookup, hence the numid is excluded.
   382	 * The hash key is bound in LONG_MAX to be used for Xarray key.
   383	 */
   384	#define MULTIPLIER	37
   385	static unsigned long get_ctl_id_hash(const struct snd_ctl_elem_id *id)
   386	{
   387		unsigned long h;
   388		const unsigned char *p;
   389	
 > 390		h = id->iface;
   391		h = MULTIPLIER * h + id->device;
   392		h = MULTIPLIER * h + id->subdevice;
   393		for (p = id->name; *p; p++)
   394			h = MULTIPLIER * h + *p;
   395		h = MULTIPLIER * h + id->index;
   396		h &= LONG_MAX;
   397		return h;
   398	}
   399	

-- 
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