Re: [PATCH v4 09/24] dept: Apply Dept to seqlock

[kernel test robot <lkp@intel.com>]

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Hi Byungchul,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on linux/master linus/master v5.17-rc7]
[cannot apply to tip/locking/core hnaz-mm/master next-20220309]
[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]

url:    https://github.com/0day-ci/linux/commits/Byungchul-Park/DEPT-Dependency-Tracker/20220304-150943
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 25795ef6299f07ce3838f3253a9cb34f64efcfae
:::::: branch date: 6 days ago
:::::: commit date: 6 days ago
config: i386-randconfig-m031-20220307 (https://download.01.org/0day-ci/archive/20220310/202203101159.1eFVxMBQ-lkp(a)intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
arch/x86/kvm/../../../virt/kvm/eventfd.c:264 irqfd_update() warn: statement has no effect 31
arch/x86/kvm/../../../virt/kvm/eventfd.c:560 kvm_irqfd_deassign() warn: statement has no effect 31
arch/x86/kvm/x86.c:2852 kvm_end_pvclock_update() warn: statement has no effect 31
drivers/md/raid5.c:8241 raid5_start_reshape() warn: statement has no effect 31

Old smatch warnings:
arch/x86/kvm/x86.c:1021 __kvm_set_xcr() warn: bitwise AND condition is false here
arch/x86/kvm/x86.c:1022 __kvm_set_xcr() warn: bitwise AND condition is false here
arch/x86/kvm/x86.c:5135 kvm_arch_tsc_set_attr() warn: check for integer overflow 'offset'
arch/x86/kvm/x86.c:5176 kvm_vcpu_ioctl_device_attr() error: uninitialized symbol 'r'.
arch/x86/kvm/x86.c:9569 enter_smm() warn: inconsistent indenting
drivers/md/raid5.c:2841 raid5_end_write_request() error: uninitialized symbol 'rdev'.
drivers/md/raid5.c:2846 raid5_end_write_request() error: uninitialized symbol 'rdev'.
drivers/md/raid5.c:6989 alloc_thread_groups() warn: double check that we're allocating correct size: 148 vs 1
drivers/md/raid5.c:8311 raid5_start_reshape() warn: statement has no effect 31

vim +264 arch/x86/kvm/../../../virt/kvm/eventfd.c

721eecbf4fe995 Gregory Haskins    2009-05-20  246  
bd2b53b20fcd0d Michael S. Tsirkin 2010-11-18  247  /* Must be called under irqfds.lock */
166c9775f1f8b8 Eric Auger         2015-09-18  248  static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd)
bd2b53b20fcd0d Michael S. Tsirkin 2010-11-18  249  {
bd2b53b20fcd0d Michael S. Tsirkin 2010-11-18  250  	struct kvm_kernel_irq_routing_entry *e;
8ba918d488cade Paul Mackerras     2014-06-30  251  	struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS];
351dc6477cd351 Andrey Smetanin    2015-10-16  252  	int n_entries;
8ba918d488cade Paul Mackerras     2014-06-30  253  
9957c86d659a4d Paul Mackerras     2014-06-30  254  	n_entries = kvm_irq_map_gsi(kvm, entries, irqfd->gsi);
bd2b53b20fcd0d Michael S. Tsirkin 2010-11-18  255  
56f89f3629ffd1 Paul Mackerras     2014-06-30  256  	write_seqcount_begin(&irqfd->irq_entry_sc);
56f89f3629ffd1 Paul Mackerras     2014-06-30  257  
8ba918d488cade Paul Mackerras     2014-06-30  258  	e = entries;
351dc6477cd351 Andrey Smetanin    2015-10-16  259  	if (n_entries == 1)
56f89f3629ffd1 Paul Mackerras     2014-06-30  260  		irqfd->irq_entry = *e;
351dc6477cd351 Andrey Smetanin    2015-10-16  261  	else
351dc6477cd351 Andrey Smetanin    2015-10-16  262  		irqfd->irq_entry.type = 0;
56f89f3629ffd1 Paul Mackerras     2014-06-30  263  
56f89f3629ffd1 Paul Mackerras     2014-06-30 @264  	write_seqcount_end(&irqfd->irq_entry_sc);
bd2b53b20fcd0d Michael S. Tsirkin 2010-11-18  265  }
bd2b53b20fcd0d Michael S. Tsirkin 2010-11-18  266  

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