Re: [Qemu-devel] [PULL 00/18] ppc-for-2.10 queue 20170714

[Peter Maydell <peter.maydell@linaro.org>]

On 14 July 2017 at 07:15, David Gibson <david@gibson.dropbear.id.au> wrote:
> The following changes since commit 49bcce4b9c11759678fd223aefb48691c4959d4f:
>
>   Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2017-07-12' into staging (2017-07-13 16:56:06 +0100)
>
> are available in the git repository at:
>
>   git://github.com/dgibson/qemu.git tags/ppc-for-2.10-20170714
>
> for you to fetch changes up to e11134d2ac7744569d7c387102368c507d340c30:
>
>   pseries: Allow HPT resizing with KVM (2017-07-14 09:28:30 +1000)
>
> ----------------------------------------------------------------
> ppc patch queue 2017-07-14
>
> Two major batches in this set, rather than the usual collection of
> assorted fixes.
>
>     * More DRC cleanup.  This gets the state management into a state
>       which should fix many of the hotplug+migration problems we've
>       had.  Plus it gets the migration stream format into something
>       well defined and pretty minimal which we can reasonably support
>       into the future.
>
>     * Hashed Page Table resizing.  It's been a while since this was
>       posted, but it's been through several previous rounds of review.
>       The kernel parts (both guest and host) are merged in 4.11, so
>       this is the only remaining piece left to allow resizing of the
>       HPT in a running guest.
>
> There are also a handful of unrelated fixes.

Hi. I'm afraid this fails to build on the w32 compiler:
  CC      ppc64-softmmu/hw/ppc/spapr.o
/home/petmay01/linaro/qemu-for-merges/hw/ppc/spapr.c: In function
‘spapr_get_resize_hpt’:
/home/petmay01/linaro/qemu-for-merges/hw/ppc/spapr.c:2642:1: error:
control reaches end of non-void functio
n [-Werror=return-type]
 }
 ^

The compiler is confused (it doesn't realise that "assert(0)"
cannot return), but you can make it happier like this:

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 09b6ff0..68f936c 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2638,7 +2638,7 @@ static char *spapr_get_resize_hpt(Object *obj,
Error **errp)
     case SPAPR_RESIZE_HPT_REQUIRED:
         return g_strdup("required");
     }
-    assert(0);
+    g_assert_not_reached();
 }

 static void spapr_set_resize_hpt(Object *obj, const char *value, Error **errp)


I think g_assert_not_reached() is easier to read anyway; I
always have to think for a moment about whether assert(0)
or assert(1) is the "always assert" condition...

thanks
-- PMM