Re: [PATCH 4/8] KVM: return value from kvm_arch_sync_dirty_log

kernel test robot
2024-09-19T02:33:08Z

Hi Lilit,

kernel test robot noticed the following build warnings:

[auto build test WARNING on powerpc/topic/ppc-kvm]
[also build test WARNING on v6.11]
[cannot apply to kvmarm/next kvm/queue linus/master kvm/linux-next next-20240918]
[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#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Lilit-Janpoladyan/arm64-add-an-interface-for-stage-2-page-tracking/20240918-233004
base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git topic/ppc-kvm
patch link: https://lore.kernel.org/r/20240918152807.25135-5-lilitj%40amazon.com
patch subject: [PATCH 4/8] KVM: return value from kvm_arch_sync_dirty_log
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20240919/202409191039.OFrXIvns-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240919/202409191039.OFrXIvns-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409191039.OFrXIvns-lkp@intel.com/

All warnings (new ones prefixed by >>):

In file included from arch/s390/kvm/kvm-s390.c:22:
In file included from include/linux/kvm_host.h:16:
In file included from include/linux/mm.h:2228:
include/linux/vmstat.h:500:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
500 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~ ^
501 | item];
| ~~~~
include/linux/vmstat.h:507:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
507 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~ ^
508 | NR_VM_NUMA_EVENT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~~
include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
514 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
include/linux/vmstat.h:519:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
519 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~ ^
520 | NR_VM_NUMA_EVENT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~~
include/linux/vmstat.h:528:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
528 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~ ^
529 | NR_VM_NUMA_EVENT_ITEMS +
| ~~~~~~~~~~~~~~~~~~~~~~
In file included from arch/s390/kvm/kvm-s390.c:22:
In file included from include/linux/kvm_host.h:19:
In file included from include/linux/msi.h:24:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/s390/include/asm/io.h:93:
include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
548 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
| ^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
| ^
In file included from arch/s390/kvm/kvm-s390.c:22:
In file included from include/linux/kvm_host.h:19:
In file included from include/linux/msi.h:24:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/s390/include/asm/io.h:93:
include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
| ^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
| ^
In file included from arch/s390/kvm/kvm-s390.c:22:
In file included from include/linux/kvm_host.h:19:
In file included from include/linux/msi.h:24:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/s390/include/asm/io.h:93:
include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
693 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
701 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
709 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
718 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
727 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
736 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> arch/s390/kvm/kvm-s390.c:705:4: warning: non-void function 'kvm_arch_sync_dirty_log' should return a value [-Wreturn-mismatch]
705 | return;
| ^
18 warnings generated.

vim +/kvm_arch_sync_dirty_log +705 arch/s390/kvm/kvm-s390.c

5b5865e81387b9 Lilit Janpoladyan 2024-09-18 679
522a3b6f0285f5 Lilit Janpoladyan 2024-09-18 680 int kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
15f36ebd34b5b2 Jason J. Herne 2012-08-02 681 {
0959e168678d2d Janosch Frank 2018-07-17 682 int i;
15f36ebd34b5b2 Jason J. Herne 2012-08-02 683 gfn_t cur_gfn, last_gfn;
0959e168678d2d Janosch Frank 2018-07-17 684 unsigned long gaddr, vmaddr;
15f36ebd34b5b2 Jason J. Herne 2012-08-02 685 struct gmap *gmap = kvm->arch.gmap;
0959e168678d2d Janosch Frank 2018-07-17 686 DECLARE_BITMAP(bitmap, _PAGE_ENTRIES);
15f36ebd34b5b2 Jason J. Herne 2012-08-02 687
0959e168678d2d Janosch Frank 2018-07-17 688 /* Loop over all guest segments */
0959e168678d2d Janosch Frank 2018-07-17 689 cur_gfn = memslot->base_gfn;
15f36ebd34b5b2 Jason J. Herne 2012-08-02 690 last_gfn = memslot->base_gfn + memslot->npages;
0959e168678d2d Janosch Frank 2018-07-17 691 for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) {
0959e168678d2d Janosch Frank 2018-07-17 692 gaddr = gfn_to_gpa(cur_gfn);
0959e168678d2d Janosch Frank 2018-07-17 693 vmaddr = gfn_to_hva_memslot(memslot, cur_gfn);
0959e168678d2d Janosch Frank 2018-07-17 694 if (kvm_is_error_hva(vmaddr))
0959e168678d2d Janosch Frank 2018-07-17 695 continue;
0959e168678d2d Janosch Frank 2018-07-17 696
0959e168678d2d Janosch Frank 2018-07-17 697 bitmap_zero(bitmap, _PAGE_ENTRIES);
0959e168678d2d Janosch Frank 2018-07-17 698 gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr);
0959e168678d2d Janosch Frank 2018-07-17 699 for (i = 0; i < _PAGE_ENTRIES; i++) {
0959e168678d2d Janosch Frank 2018-07-17 700 if (test_bit(i, bitmap))
0959e168678d2d Janosch Frank 2018-07-17 701 mark_page_dirty(kvm, cur_gfn + i);
0959e168678d2d Janosch Frank 2018-07-17 702 }
15f36ebd34b5b2 Jason J. Herne 2012-08-02 703
1763f8d09d522b Christian Borntraeger 2016-02-03 704 if (fatal_signal_pending(current))
1763f8d09d522b Christian Borntraeger 2016-02-03 @705 return;
70c88a00fbf659 Christian Borntraeger 2016-02-02 706 cond_resched();
15f36ebd34b5b2 Jason J. Herne 2012-08-02 707 }
522a3b6f0285f5 Lilit Janpoladyan 2024-09-18 708 return 0;
15f36ebd34b5b2 Jason J. Herne 2012-08-02 709 }
15f36ebd34b5b2 Jason J. Herne 2012-08-02 710

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