Re: [Xen-devel] [PATCH v2 5/5] libxl: Add explicit cast to libxl_psr_cat_set_cbm

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2016-01-19 at 14:06 +0000, Ian Jackson wrote:
> Chester Lin writes ("[PATCH v2 5/5] libxl: Add explicit cast to
> libxl_psr_cat_set_cbm"):
> > Fixes Coverity CID 1343299. The call to xc_psr_cat_set_domain_data()
> > expects type xc_psr_cat_type but is provided libxl_psr_cbm_type which
> > is defined in IDL.
> > 
> > The two enums are deliberately identical and IDL only exists so that
> > libxl clients don't need to include libxc headers directly.
> > 
> > This change adds an explicit cast to fix the
> > Coverity warning, and tweaks the surrounding code to more closely
> > conform to the guidelines in CODING_STYLE.
> 
> I can see why Coverity is complaining.ÂÂI think, overall, that the
> existing situation is not really desirable.
> 
> 
> In fact there are not two but *three* of these enums:
> 
> Â* XEN_DOMCTL_PSR_CAT_OP_SET_L3_* (public/domctl.h)
> Â* enum xc_psr_cat_type (xenctrl.h)
> Â* Enumeration("psr_cbm_type",...) (libxl_types.idl)

Forgot to say in my other reply, but we could try and abolish at least the
xc one and have libxl internally use the domctl values.

I should also have said I think all of this is a bit much to ask Chester to
tackle given that the intro[0] explains that the Coverity stuff is just in
order to gain some familiarity before embarking on a "proper" project.

Ian.

[0]Âhttp://lists.xen.org/archives/html/xen-devel/2015-12/msg00629.html


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