linux-kernel - Re: [linux-safety] [PATCH] usb: host: ehci-sched: add comment about find

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Date:   Tue, 13 Oct 2020 07:41:40 +0200 (CEST)
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        linux-kernel@...r.kernel.org, linux-safety@...ts.elisa.tech,
        linux-usb@...r.kernel.org
Subject: Re: [linux-safety] [PATCH] usb: host: ehci-sched: add comment about
 find_tt() not returning error



On Tue, 13 Oct 2020, Greg Kroah-Hartman wrote:

> On Mon, Oct 12, 2020 at 08:17:34PM +0200, Lukas Bulwahn wrote:
> > > If you are suggesting some sort of special code annotation that the tool 
> > > would understand, I am open to that.  But I'm not aware of any even 
> > > vaguely standard way of marking up a particular function call to 
> > > indicate it will not return an error.
> > 
> > I cannot yet say if some annotation would work, we, Sudip and me, need to 
> > investigate. It could be that something like, assert(!IS_ERR(tt)), is 
> > sufficient to let the tools know that they can safely assume that the 
> > path they are complaining about is not possible.
> > 
> > We could make the assert() a nop, so it would not effect the resulting 
> > object code in any way.
> 
> Things like assert() have been rejected numberous times in the past in
> the kernel, good luck with that :)
>

Greg, we have been warned by you now; so, we are well aware what could 
await us just as numerous others before.

Lukas