[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH] do_multicall and MISRA Rule 8.3\



On Fri, 15 Mar 2024, George Dunlap wrote:
> On Fri, Mar 15, 2024 at 2:13 PM Jan Beulich <jbeulich@xxxxxxxx> wrote:
> >
> > On 15.03.2024 14:55, Julien Grall wrote:
> > > Hi Jan,
> > >
> > > On 15/03/2024 13:24, Jan Beulich wrote:
> > >> On 15.03.2024 13:17, George Dunlap wrote:
> > >>> On Fri, Mar 15, 2024 at 11:57 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
> > >>>>> It sounds like Andy and Stefano feel like this is a situation where "a
> > >>>>> fixed width quantity is meant"; absent any further guidance from the
> > >>>>> CODING_STYLE about when fixed widths should or should not be used, I
> > >>>>> don't think this change would be a violation of CODING_STYLE.
> [snip]
> > >>> Other than "it's in CODING_STYLE", and "it's not really necessary
> > >>> because it's ensured in the assembly code", you haven't advanced a
> > >>> single reason why "uint32_t" is problematic.
> > >>
> > >> And it isn't, I never said it would be. But if we set rules for
> > >> ourselves, why would we take the first opportunity to not respect them?
> > >
> > > I am a bit confused. Reading through the thread you seem to agree that
> > > the written rules are respected here. So what rules are you talking about?
> >
> > What was proposed is use of a fixed width type where according to my
> > reading ./CODING_STYLE says it shouldn't be used.
> 
> This conversation is starting to get frustrating.  That's simply not
> what it says, and I pointed that out just a few messages ago.
> 
> To reiterate:The text says fixed-width types are OK when a fixed-width
> quantity is "meant"; and that in this case, Stefano and Andy "mean" to
> use a fixed-width quantity.  The implied subtext of that sentence
> could be, "Don't use fixed width types unless there's a good reason to
> use a fixed width", and both Andy and Stefano think there's a good
> reason.  This argument you haven't really addressed at all, except
> with a specious "slippery slope" argument meant to nullify the
> exception; and now you attempt to simply ignore.
> 
> I venture to assert that for most people, the rules are a means to an
> end: That end being code which is correct, robust, fast, easy to
> write, maintain, debug, and review patches for.  What I agreed to,
> when I accepted this patch, was that *in general* we would avoid using
> fixed-width types; but that there were cases where doing so made
> sense.  Some of those were discussed in the thread above.
> 
> Andy and Stefano have already put forward reasons why they think a
> fixed-width type would be better here, which are related to "end
> goals": namely, more robust and easy to maintain code.  When I asked
> what "end goals" would be negatively impacted by using a fixed-width
> type, you explicitly said that there were none!  That the *only*
> reason you're continuing to argue is that we have a document somewhere
> that says we should -- a document which explicitly acknowledges that
> there will be exceptions!
> 
> The ideal response would have been to lay out a reasonably
> comprehensive set of criteria for when to use basic types, when to use
> fixed-width types, and how each criteria advanced the end goals of a
> better codebase.  A sufficient response would have been to lay out
> reasons why "better codebase", in this instance, tilts towards using a
> basic type rather than a fixed-width type.
> 
> Saying "That's what the rules say", without motivating it by
> explaining how it connects to a better codebase, is just not a helpful
> response; and making that argument after it's been pointed out that
> that is *not* what the rules say is even worse.

Thanks George for taking the time to write all of the above.

Let's please move forward with this patch.

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.