linux-kernel - Re: dealing with gcc 'comparison is always false' warnings (was: [PATCH] drivers/infiniband: fix comparsion between unsigned and negative)

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Date:	Thu, 31 May 2007 00:53:20 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Satyam Sharma" <satyam.sharma@...il.com>,
	"Roland Dreier" <rdreier@...co.com>, openib-general@...nib.org,
	linux-kernel@...r.kernel.org
Subject: Re: dealing with gcc 'comparison is always false' warnings (was: [PATCH] drivers/infiniband: fix comparsion between unsigned and negative)

Hi Bill,

On 5/31/07, Bill Nottingham <notting@...hat.com> wrote:
> Satyam Sharma (satyam.sharma@...il.com) said:
> > But yes, the kind of "fixes" you pointed out that _remove_ these conditions
> > are definitely *not* what we would want to do.
>
> I can see that - but I think it should be at least be brought up for each
> warning, to determine either:
>
> 1) if it should be ignored
> 2) if a signed type is actually intended
> 3) if the code should be elided

Agreed. The extract you've pointed out above was too strongly worded
unnecessarily / wrong generalization, and I corrected it later.

> While not necessarily in the IB instances, there are cases where there
> are entire blocks of code (with debugging output, error returns, etc)
> that can never get run, and it may make sense to remove those.

Agreed, again.

Satyam
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