Re: [bug report] dm-pcache: add persistent cache target in device-mapper

[Dongsheng Yang <dongsheng.yang@linux.dev>]

在 8/29/2025 5:14 PM, Dan Carpenter 写道:
> On Fri, Aug 29, 2025 at 02:03:36PM +0800, Dongsheng Yang wrote:
>> 在 8/29/2025 1:39 PM, Dan Carpenter 写道:
>>> Hello Dongsheng Yang,
>>>
>>> Commit 1d57628ff95b ("dm-pcache: add persistent cache target in
>>> device-mapper") from Aug 12, 2025 (linux-next), leads to the
>>> following Smatch static checker warning:
>>>
>>> 	drivers/md/dm-pcache/cache_segment.c:263 cache_seg_gen_increase()
>>> 	warn: sleeping in atomic context
>>
>> Hi Dan,
>>
>>      Thanx for your report, I will send out the patch after my testing
>> finished.
>>
>> BTW, can you share the Smatch checking command or script? I want to add
>>
>> Smatch check in my testing suit if possible, I did not found this kind of
>> problem with simple:
>>
>> make CHECK="smatch -p=kernel" C=1 M=drivers/md/dm-pcache
>>
> It requires several rebuilds of the cross function database...  Everytime
> you rebuild then it does:
>
> First build: cache_data_alloc() disables preemption calls cache_seg_put()
> Second build: cache_seg_put() calls cache_seg_invalidate()
> Third build: cache_seg_invalidate() calls cache_seg_gen_increase()
>
> Rebuilding the databse takes hours and hours.
>
> ~/path/to/smatch/smatch_scripts/build_kernel_data.sh


Thanx for  your share, I will give it a try, it seems really found issue 
I did not hit in my testing.

>
> regards,
> dan carpenter
>