linux-kernel - Re: include/trace/events/nilfs2.h:191:1: sparse: sparse: cast to restricted blk_opf

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Message-ID: <18f28bb5-d8ac-20a5-fd6a-932cda454209@acm.org>
Date:   Thu, 4 Aug 2022 20:07:20 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Ryusuke Konishi <konishi.ryusuke@...il.com>
Subject: Re: include/trace/events/nilfs2.h:191:1: sparse: sparse: cast to
 restricted blk_opf_t

On 8/4/22 19:03, kernel test robot wrote:
> sparse warnings: (new ones prefixed by >>)
>     fs/nilfs2/segment.c: note: in included file (through include/trace/trace_events.h, include/trace/define_trace.h, include/trace/events/nilfs2.h):
>>> include/trace/events/nilfs2.h:191:1: sparse: sparse: cast to restricted blk_opf_t
>>> include/trace/events/nilfs2.h:191:1: sparse: sparse: cast to restricted blk_opf_t
>>> include/trace/events/nilfs2.h:191:1: sparse: sparse: restricted blk_opf_t degrades to integer
>>> include/trace/events/nilfs2.h:191:1: sparse: sparse: restricted blk_opf_t degrades to integer
> 
> vim +191 include/trace/events/nilfs2.h

Hi Luc and Linus,

I think the above sparse warnings refer to the following macro:

#define is_signed_type(type)	(((type)(-1)) < (type)1)

Is the current plan still to modify sparse such that it stops 
complaining about the above macro?

See also 
https://lore.kernel.org/linux-sparse/20220626095814.7wtma47w4sph7dha@mail/

Thanks,

Bart.