drivers/acpi/x86/s2idle.c:395:13: sparse: sparse: restricted suspend_state_t degrades to integer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   614cb5894306cfa2c7d9b6168182876ff5948735
commit: fef98671194be005853cbbf51b164a3927589b64 ACPI: PM: s2idle: Move x86-specific code to the x86 directory
date:   6 days ago
config: i386-randconfig-s001-20201221 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-184-g1b896707-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fef98671194be005853cbbf51b164a3927589b64
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout fef98671194be005853cbbf51b164a3927589b64
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


"sparse warnings: (new ones prefixed by >>)"
>> drivers/acpi/x86/s2idle.c:395:13: sparse: sparse: restricted suspend_state_t degrades to integer
   drivers/acpi/x86/s2idle.c:395:33: sparse: sparse: restricted suspend_state_t degrades to integer

vim +395 drivers/acpi/x86/s2idle.c

   348	
   349	static int lps0_device_attach(struct acpi_device *adev,
   350				      const struct acpi_device_id *not_used)
   351	{
   352		union acpi_object *out_obj;
   353	
   354		if (lps0_device_handle)
   355			return 0;
   356	
   357		if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
   358			return 0;
   359	
   360		if (acpi_s2idle_vendor_amd()) {
   361			guid_parse(ACPI_LPS0_DSM_UUID_AMD, &lps0_dsm_guid);
   362			out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 0, 0, NULL);
   363			rev_id = 0;
   364		} else {
   365			guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
   366			out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
   367			rev_id = 1;
   368		}
   369	
   370		/* Check if the _DSM is present and as expected. */
   371		if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
   372			acpi_handle_debug(adev->handle,
   373					  "_DSM function 0 evaluation failed\n");
   374			return 0;
   375		}
   376	
   377		lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
   378	
   379		ACPI_FREE(out_obj);
   380	
   381		acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
   382				  lps0_dsm_func_mask);
   383	
   384		lps0_device_handle = adev->handle;
   385	
   386		if (acpi_s2idle_vendor_amd())
   387			lpi_device_get_constraints_amd();
   388		else
   389			lpi_device_get_constraints();
   390	
   391		/*
   392		 * Use suspend-to-idle by default if the default suspend mode was not
   393		 * set from the command line.
   394		 */
 > 395		if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
   396			mem_sleep_current = PM_SUSPEND_TO_IDLE;
   397	
   398		/*
   399		 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
   400		 * EC GPE to be enabled while suspended for certain wakeup devices to
   401		 * work, so mark it as wakeup-capable.
   402		 */
   403		acpi_ec_mark_gpe_for_wake();
   404	
   405		return 0;
   406	}
   407	

---
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