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Date:   Mon, 10 Aug 2020 10:24:18 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     David Hildenbrand <dhildenb@...hat.com>,
        kernel test robot <lkp@...el.com>
Cc:     David Hildenbrand <david@...hat.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>
Subject: Re: [kbuild-all] Re: drivers/virtio/virtio_mem.c:1031
 virtio_mem_mb_plug_any_sb() error: uninitialized symbol 'rc'.



On 8/8/20 8:44 PM, David Hildenbrand wrote:
>
>> Am 08.08.2020 um 13:39 schrieb kernel test robot <lkp@...el.com>:
>>
>> ´╗┐tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   449dc8c97089a6e09fb2dac4d92b1b7ac0eb7c1e
>> commit: 5f1f79bbc9e26fa9412fa9522f957bb8f030c442 virtio-mem: Paravirtualized memory hotplug
>> date:   9 weeks ago
>> config: x86_64-randconfig-m001-20200808 (attached as .config)
>> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
> Was there a delay in sending these out? The fix by Dan is long upstream: 1c3d69ab5348
Hi David,

Sorry for the inconvenience, the bot will check head commit before 
reporting usually, we'll take a look.

Best Regards,
Rong Chen

>
>> New smatch warnings:
>> drivers/virtio/virtio_mem.c:1031 virtio_mem_mb_plug_any_sb() error: uninitialized symbol 'rc'.
>> drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dce_calcs.c:1607 calculate_bandwidth() warn: Function too hairy.  No more merges.
>>
>> Old smatch warnings:
>> drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dce_calcs.c:3387 bw_calcs() warn: inconsistent indenting
>>
>> vim +/rc +1031 drivers/virtio/virtio_mem.c
>>
>>    978
>>    979    /*
>>    980     * Try to plug the desired number of subblocks of a memory block that
>>    981     * is already added to Linux.
>>    982     *
>>    983     * Will modify the state of the memory block.
>>    984     *
>>    985     * Note: Can fail after some subblocks were successfully plugged.
>>    986     */
>>    987    static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id,
>>    988                         uint64_t *nb_sb, bool online)
>>    989    {
>>    990        unsigned long pfn, nr_pages;
>>    991        int sb_id, count;
>>    992        int rc;
>>    993
>>    994        if (WARN_ON_ONCE(!*nb_sb))
>>    995            return -EINVAL;
>>    996
>>    997        while (*nb_sb) {
>>    998            sb_id = virtio_mem_mb_first_unplugged_sb(vm, mb_id);
>>    999            if (sb_id >= vm->nb_sb_per_mb)
>>   1000                break;
>>   1001            count = 1;
>>   1002            while (count < *nb_sb &&
>>   1003                   sb_id + count < vm->nb_sb_per_mb &&
>>   1004                   !virtio_mem_mb_test_sb_plugged(vm, mb_id, sb_id + count,
>>   1005                                  1))
>>   1006                count++;
>>   1007
>>   1008            rc = virtio_mem_mb_plug_sb(vm, mb_id, sb_id, count);
>>   1009            if (rc)
>>   1010                return rc;
>>   1011            *nb_sb -= count;
>>   1012            if (!online)
>>   1013                continue;
>>   1014
>>   1015            /* fake-online the pages if the memory block is online */
>>   1016            pfn = PFN_DOWN(virtio_mem_mb_id_to_phys(mb_id) +
>>   1017                       sb_id * vm->subblock_size);
>>   1018            nr_pages = PFN_DOWN(count * vm->subblock_size);
>>   1019            virtio_mem_fake_online(pfn, nr_pages);
>>   1020        }
>>   1021
>>   1022        if (virtio_mem_mb_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb)) {
>>   1023            if (online)
>>   1024                virtio_mem_mb_set_state(vm, mb_id,
>>   1025                            VIRTIO_MEM_MB_STATE_ONLINE);
>>   1026            else
>>   1027                virtio_mem_mb_set_state(vm, mb_id,
>>   1028                            VIRTIO_MEM_MB_STATE_OFFLINE);
>>   1029        }
>>   1030
>>> 1031        return rc;
>>   1032    }
>>   1033
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>> <.config.gz>
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