[morse:mpam/monitors_and_locking/v4 15/24] arch/x86/kernel/cpu/resctrl/monitor.c:339:26: sparse: sparse: incompatible types for operation (<):

[morse:mpam/monitors_and_locking/v4 15/24] arch/x86/kernel/cpu/resctrl/monitor.c:339:26: sparse: sparse: incompatible types for operation (<):

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/monitors_and_locking/v4
head:   7a2faaa86a608f308185f2dc0c503e6c103a9206
commit: 7b6c0f41fa6f30fef835940b8f10b37bddbeaf11 [15/24] x86/resctrl: Allow arch to allocate memory needed in resctrl_arch_rmid_read()
config: i386-randconfig-s001-20230525 (https://download.01.org/0day-ci/archive/20230526/202305261902.SPC4AVIV-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 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/morse/linux.git/commit/?id=7b6c0f41fa6f30fef835940b8f10b37bddbeaf11
        git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
        git fetch --no-tags morse mpam/monitors_and_locking/v4
        git checkout 7b6c0f41fa6f30fef835940b8f10b37bddbeaf11
        # 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 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/cpu/resctrl/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305261902.SPC4AVIV-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/x86/kernel/cpu/resctrl/monitor.c:339:26: sparse: sparse: incompatible types for operation (<):
>> arch/x86/kernel/cpu/resctrl/monitor.c:339:26: sparse:    void *[assigned] arch_mon_ctx
>> arch/x86/kernel/cpu/resctrl/monitor.c:339:26: sparse:    int
   arch/x86/kernel/cpu/resctrl/monitor.c:760:37: sparse: sparse: incompatible types for operation (<):
   arch/x86/kernel/cpu/resctrl/monitor.c:760:37: sparse:    void *[assigned] arch_mon_ctx
   arch/x86/kernel/cpu/resctrl/monitor.c:760:37: sparse:    int
   arch/x86/kernel/cpu/resctrl/monitor.c:771:37: sparse: sparse: incompatible types for operation (<):
>> arch/x86/kernel/cpu/resctrl/monitor.c:771:37: sparse:    void *[addressable] [assigned] arch_mon_ctx
   arch/x86/kernel/cpu/resctrl/monitor.c:771:37: sparse:    int

vim +339 arch/x86/kernel/cpu/resctrl/monitor.c

   321	
   322	/*
   323	 * Check the RMIDs that are marked as busy for this domain. If the
   324	 * reported LLC occupancy is below the threshold clear the busy bit and
   325	 * decrement the count. If the busy count gets to zero on an RMID, we
   326	 * free the RMID
   327	 */
   328	void __check_limbo(struct rdt_domain *d, bool force_free)
   329	{
   330		struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl;
   331		u32 idx_limit = resctrl_arch_system_num_rmid_idx();
   332		struct rmid_entry *entry;
   333		u32 idx, cur_idx = 1;
   334		void *arch_mon_ctx;
   335		bool rmid_dirty;
   336		u64 val = 0;
   337	
   338		arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, QOS_L3_OCCUP_EVENT_ID);
 > 339		if (arch_mon_ctx < 0)
   340			return;
   341	
   342		/*
   343		 * Skip RMID 0 and start from RMID 1 and check all the RMIDs that
   344		 * are marked as busy for occupancy < threshold. If the occupancy
   345		 * is less than the threshold decrement the busy counter of the
   346		 * RMID and move it to the free list when the counter reaches 0.
   347		 */
   348		for (;;) {
   349			idx = find_next_bit(d->rmid_busy_llc, idx_limit, cur_idx);
   350			if (idx >= idx_limit)
   351				break;
   352	
   353			entry = __rmid_entry(idx);
   354			if (resctrl_arch_rmid_read(r, d, entry->closid, entry->rmid,
   355						   QOS_L3_OCCUP_EVENT_ID, &val,
   356						   arch_mon_ctx)) {
   357				rmid_dirty = true;
   358			} else {
   359				rmid_dirty = (val >= resctrl_rmid_realloc_threshold);
   360			}
   361	
   362			if (force_free || !rmid_dirty) {
   363				clear_bit(idx, d->rmid_busy_llc);
   364				if (!--entry->busy)
   365					limbo_release_entry(entry);
   366			}
   367			cur_idx = idx + 1;
   368		}
   369	
   370		resctrl_arch_mon_ctx_free(r, QOS_L3_OCCUP_EVENT_ID, arch_mon_ctx);
   371	}
   372	

-- 
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