linux-kernel - [tip:timers/vdso 33/41] arch/x86/entry/vdso/vma.c:199:3: warning: label followed by a declaration is a C23 extension

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Message-ID: <202411022359.fBPFTg2T-lkp@intel.com>
Date: Sat, 2 Nov 2024 23:39:02 +0800
From: kernel test robot <lkp@...el.com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [tip:timers/vdso 33/41] arch/x86/entry/vdso/vma.c:199:3: warning:
 label followed by a declaration is a C23 extension

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso
head:   a812eee0b68645e2916d4a4399280fe5471cac67
commit: e93d2521b27f0439872dfa4e4b92a9be6d73496f [33/41] x86/vdso: Split virtual clock pages into dedicated mapping
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20241102/202411022359.fBPFTg2T-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241102/202411022359.fBPFTg2T-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411022359.fBPFTg2T-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/x86/entry/vdso/vma.c:7:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     524 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     525 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> arch/x86/entry/vdso/vma.c:199:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     199 |                 struct pvclock_vsyscall_time_info *pvti =
         |                 ^
   arch/x86/entry/vdso/vma.c:209:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     209 |                 unsigned long pfn = hv_get_tsc_pfn();
         |                 ^
   6 warnings generated.


vim +199 arch/x86/entry/vdso/vma.c

   192	
   193	static vm_fault_t vvar_vclock_fault(const struct vm_special_mapping *sm,
   194					    struct vm_area_struct *vma, struct vm_fault *vmf)
   195	{
   196		switch (vmf->pgoff) {
   197	#ifdef CONFIG_PARAVIRT_CLOCK
   198		case VDSO_PAGE_PVCLOCK_OFFSET:
 > 199			struct pvclock_vsyscall_time_info *pvti =
   200				pvclock_get_pvti_cpu0_va();
   201			if (pvti && vclock_was_used(VDSO_CLOCKMODE_PVCLOCK))
   202				return vmf_insert_pfn_prot(vma, vmf->address,
   203						__pa(pvti) >> PAGE_SHIFT,
   204						pgprot_decrypted(vma->vm_page_prot));
   205			break;
   206	#endif /* CONFIG_PARAVIRT_CLOCK */
   207	#ifdef CONFIG_HYPERV_TIMER
   208		case VDSO_PAGE_HVCLOCK_OFFSET:
   209			unsigned long pfn = hv_get_tsc_pfn();
   210	
   211			if (pfn && vclock_was_used(VDSO_CLOCKMODE_HVCLOCK))
   212				return vmf_insert_pfn(vma, vmf->address, pfn);
   213			break;
   214	#endif /* CONFIG_HYPERV_TIMER */
   215		}
   216	
   217		return VM_FAULT_SIGBUS;
   218	}
   219	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki