Re: [PATCH] xen/arm: Fix printk specifiers and arguments in iomem_remove_cb()

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 6 Sep 2023, Vikram Garhwal wrote:
> On Wed, Sep 06, 2023 at 12:30:14PM +0200, Michal Orzel wrote:
> > When building Xen for arm32 with CONFIG_DTB_OVERLAY, the following
> > error is printed:
> > 
> > common/dt-overlay.c: In function ‘iomem_remove_cb’:
> > ././include/xen/config.h:55:24: error: format ‘%llx’ expects argument of 
> > type ‘long long unsigned int’, but argument 3 has type ‘long unsigned int’ 
> > [-Werror=format=]
> > 
> > Function parameters s and e (denoting MMIO region) are of type unsigned
> > long and indicate frame numbers and not addresses. This also means that
> > the arguments passed to printk() are incorrect (using PAGE_ALIGN() or
> > PAGE_MASK ANDed with a frame number results in unwanted output). Fix it.
> > 
> > Take the opportunity to switch to %pd specifier to print domain id in
> > a consolidated way.
> > 
> > Fixes: 7e5c4a8b86f1 ("xen/arm: Implement device tree node removal 
> > functionalities")
> > Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
> Reviewed-by: Vikram Garhwal <vikram.garhwal@xxxxxxx>

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> > ---
> > After this patch (and the one for xl), we are left with one issue breaking 
> > CI:
> > https://gitlab.com/xen-project/patchew/xen/-/jobs/5026938514
> > ---
> >  xen/common/dt-overlay.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> > 
> > diff --git a/xen/common/dt-overlay.c b/xen/common/dt-overlay.c
> > index b07a6128dc99..5663a049e90a 100644
> > --- a/xen/common/dt-overlay.c
> > +++ b/xen/common/dt-overlay.c
> > @@ -251,10 +251,8 @@ static int iomem_remove_cb(unsigned long s, unsigned 
> > long e, void *dom,
> >      rc = iomem_deny_access(d, s, e);
> >      if ( rc )
> >      {
> > -        printk(XENLOG_ERR "Unable to remove dom%d access to"
> > -               " 0x%"PRIx64" - 0x%"PRIx64"\n",
> > -               d->domain_id,
> > -               s & PAGE_MASK, PAGE_ALIGN(e) - 1);
> > +        printk(XENLOG_ERR "Unable to remove %pd access to %#lx - %#lx\n",
> > +               d, s, e);
> >      }
> >      else
> >          *c += e - s + 1;
> > -- 
> > 2.25.1
> > 
>