Re: [Xen-devel] [PATCH v5 11/18] x86/mem_sharing: Replace MEM_SHARING_DEBUG with gdprintk

[Jan Beulich <jbeulich@suse.com>]

On 21.01.2020 18:49, Tamas K Lengyel wrote:
> @@ -538,24 +535,26 @@ static int audit(void)
>              d = get_domain_by_id(g->domain);
>              if ( d == NULL )
>              {
> -                MEM_SHARING_DEBUG("Unknown dom: %hu, for PFN=%lx, MFN=%lx\n",
> -                                  g->domain, g->gfn, mfn_x(mfn));
> +                gdprintk(XENLOG_ERR,
> +                         "Unknown dom: %pd, for PFN=%lx, MFN=%lx\n",
> +                         d, g->gfn, mfn_x(mfn));

With "if ( d == NULL )" around this you hardly mean to pass d to
the function here. This is a case where you really need to stick
to logging a raw number.

>                  errors++;
>                  continue;
>              }
>              o_mfn = get_gfn_query_unlocked(d, g->gfn, &t);
>              if ( !mfn_eq(o_mfn, mfn) )
>              {
> -                MEM_SHARING_DEBUG("Incorrect P2M for d=%hu, PFN=%lx."
> -                                  "Expecting MFN=%lx, got %lx\n",
> -                                  g->domain, g->gfn, mfn_x(mfn), mfn_x(o_mfn));
> +                gdprintk(XENLOG_ERR, "Incorrect P2M for d=%pd, PFN=%lx."

Here and elsewhere may I recommend dropping d= (or dom= further
down)?

> @@ -757,10 +756,10 @@ static int debug_mfn(mfn_t mfn)
>          return -EINVAL;
>      }
>  
> -    MEM_SHARING_DEBUG(
> -        "Debug page: MFN=%lx is ci=%lx, ti=%lx, owner=%pd\n",
> -        mfn_x(page_to_mfn(page)), page->count_info,
> -        page->u.inuse.type_info, page_get_owner(page));
> +    gdprintk(XENLOG_ERR,
> +             "Debug page: MFN=%lx is ci=%lx, ti=%lx, owner_id=%d\n",
> +             mfn_x(page_to_mfn(page)), page->count_info,
> +             page->u.inuse.type_info, page_get_owner(page)->domain_id);

As indicated before (I think), please prefer %pd and a struct domain
pointer over passing ->domain_id (at least one more instance further
down).

Jan

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