linux-kernel - Re: [for-linus][PATCH 01/10] tracing: Suppress sparse warnings triggered by is_signed

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Message-ID: <b1ee4daa-d21d-27bc-527a-cc5e989a2876@acm.org>
Date:   Tue, 23 Aug 2022 20:46:23 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [for-linus][PATCH 01/10] tracing: Suppress sparse warnings
 triggered by is_signed_type()

On 8/23/22 18:49, Linus Torvalds wrote:
> That's the
> 
>> It does require that kernel change to make
>>
>>    #define is_signed_type(type)   (((type)(-1)) <= (type)0)
> 
> part I was talking about.
> 
> So your kernel side patch looks fine, except I don't think you need
> the '__force' - the sparse patches in my tree should make sparse happy
> about casting '-1'.

Thank you for having provided this feedback. If I change the
is_signed_type() definition into the above (no __force), the sparse
warnings shown in my previous email disappear. Now I'm puzzled about
how this is possible. I guess I should take a closer look at the sparse
patches.

Bart.