Re: [PATCH 23/26] sh_eth: constify local structures

Julia Lawall
2016-09-12T09:43:05Z

On Sun, 11 Sep 2016, Sergei Shtylyov wrote:

> On 09/11/2016 04:06 PM, Julia Lawall wrote:
> > For structure types defined in the same file or local header files, find
> > top-level static structure declarations that have the following
> > properties:
> > 1. Never reassigned.
>
> Really?
>
> > 2. Address never taken
>
> Really?

OK, I see the problem. The code has, eg:

{ "sh7724-ether", (kernel_ulong_t)&sh7724_data }

Coccinelle doesn't know anything about kernel_ulong_t, so it assumes that
it is an identifier, and that the whole expression is a bit and, rather
than an address computation. And at the same time, the cast causes the
compiler to discard the const annotation, so it doesn't complain either.

I can update the rule to avoid this case, since taking a bit and on the
address of a top-level structure is not likely to be useful, and I will
check whether any of the other patches are affected by this issue.

Thanks for the report.

julia

>
> > 3. Not passed to a top-level macro call
> > 4. No pointer or array-typed field passed to a function or stored in a
> > variable.
> > Declare structures having all of these properties as const.
> >
> > Done using Coccinelle.
> > Based on a suggestion by Joe Perches <joe@perches.com>.
> >
> > Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
>
> NAK, see sh_eth_set_default_cpu_data().
>
> MBR, Sergei
>
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