Re: [Qemu-block] [PATCH] xen: Fix format string

[Paul Durrant]

> -----Original Message-----
> From: Xen-devel [mailto:address@hidden On Behalf
> Of Paul Durrant
> Sent: 16 January 2019 12:04
> To: 'Philippe Mathieu-Daudé' <address@hidden>; address@hidden
> Cc: Kevin Wolf <address@hidden>; Stefano Stabellini
> <address@hidden>; address@hidden; Max Reitz
> <address@hidden>; Anthony Perard <address@hidden>; xen-
> address@hidden
> Subject: Re: [Xen-devel] [PATCH] xen: Fix format string
> 
> > -----Original Message-----
> > From: Philippe Mathieu-Daudé [mailto:address@hidden
> > Sent: 16 January 2019 12:01
> > To: address@hidden
> > Cc: Paul Durrant <address@hidden>; Anthony Perard
> > <address@hidden>; Max Reitz <address@hidden>; qemu-
> > address@hidden; Stefano Stabellini <address@hidden>; xen-
> > address@hidden; Kevin Wolf <address@hidden>; Philippe
> > Mathieu-Daudé <address@hidden>
> > Subject: [PATCH] xen: Fix format string
> >
> > Trivial format string fix to solve:
> >
> >   hw/block/xen-block.c: In function 'xen_block_realize':
> >   hw/block/xen-block.c:218:53: error: format '%lu' expects argument of
> > type 'long unsigned int', but argument 4 has type 'int64_t {aka long
> long
> > int}' [-Werror=format=]
> >       xen_device_backend_printf(xendev, "sectors", "%lu",
> >                                                       ^
> >                                 blk_getlength(conf->blk) /
> >                                 conf->logical_block_size);
> >
> > blk_getlength() returns an int64_t.
> >
> > Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
> 
> Reviewed-by: Paul Durrant <address@hidden>

Actually, the alternative patch from Alex is better as it will work in the case 
where longs are not 64-bit.

  Paul

> 
> > ---
> >  hw/block/xen-block.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c
> > index be28b63442..3cf215b730 100644
> > --- a/hw/block/xen-block.c
> > +++ b/hw/block/xen-block.c
> > @@ -215,7 +215,7 @@ static void xen_block_realize(XenDevice *xendev,
> Error
> > **errp)
> >
> >      xen_device_backend_printf(xendev, "sector-size", "%u",
> >                                conf->logical_block_size);
> > -    xen_device_backend_printf(xendev, "sectors", "%lu",
> > +    xen_device_backend_printf(xendev, "sectors", "%lld",
> >                                blk_getlength(conf->blk) /
> >                                conf->logical_block_size);
> >
> > --
> > 2.17.2
> 
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