linux-kernel - Re: [PATCH v2 1/2] ARM: Fix some check warnings of tool sparse

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Date:   Tue, 11 Oct 2022 10:13:50 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] ARM: Fix some check warnings of tool sparse



On 2022/10/11 0:05, Russell King (Oracle) wrote:
> On Mon, Oct 10, 2022 at 05:53:45PM +0800, Zhen Lei wrote:
>> Fix the following warnings:
>>  warning: incorrect type in initializer (different address spaces)
>>     expected unsigned short [noderef] __user *register __p
>>     got unsigned short [usertype] *
>>  warning: cast removes address space '__user' of expression
> 
> I have a general principle that not all warnings should be fixed,
> especially when it comes to sparse.

OK, I got it.

> 
> The aim is not to get to zero warnings - it's to get to a point where
> the code is correct, and plastering the code with __force casts means
> it isn't correct - you're just masking the warning.
> 
> So no, I really don't like this. And I really don't like seeing
> __force being used in open code in casts.

OK, I will clear only the first warning and leave the second warning.

> 

-- 
Regards,
  Zhen Lei