linux-kernel - Re: [PATCH v2] io_uring: fix sparce warnings about __kernel_rwf

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Message-ID: <2eb22fb3-40cc-48f6-8ba9-5faeae0b43ff@kernel.dk>
Date:   Thu, 19 May 2022 06:13:36 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Christoph Hellwig <hch@...radead.org>,
        Vasily Averin <vvs@...nvz.org>
Cc:     kernel@...nvz.org, linux-kernel@...r.kernel.org,
        Pavel Begunkov <asml.silence@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, io-uring@...r.kernel.org
Subject: Re: [PATCH v2] io_uring: fix sparce warnings about __kernel_rwf_t
 casts

On 5/19/22 1:03 AM, Christoph Hellwig wrote:
>> index cddf5b6fbeb4..34839f30caee 100644
>> --- a/include/trace/events/io_uring.h
>> +++ b/include/trace/events/io_uring.h
>> @@ -520,7 +520,7 @@ TRACE_EVENT(io_uring_req_failed,
>>  		__entry->off		= sqe->off;
>>  		__entry->addr		= sqe->addr;
>>  		__entry->len		= sqe->len;
>> -		__entry->op_flags	= sqe->rw_flags;
>> +		__entry->op_flags	= sqe->poll32_events;
>>  		__entry->buf_index	= sqe->buf_index;
>>  		__entry->personality	= sqe->personality;
>>  		__entry->file_index	= sqe->file_index;
> 
> For which I did not see a warning even if it looks real to me.
> But this union with basically a lot of __u32s here looks pretty
> strange to start with to me.

Vasily, if this is still causing unnecessary sparse spews, please send a
revised one against the current branch.

The union is the per-op flags. The requests that use them have a member
in there, either one can be used for printing it obviously.

-- 
Jens Axboe