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Re: [libvirt] [PATCH] qemu: Fix compilation error when enum variable size differs from 'int'



On Mon, May 25, 2015 at 05:35:19PM +0200, Michal Privoznik wrote:
On 25.05.2015 17:18, Peter Krempa wrote:
Since commit bcd9a564b631aa virDomainNumatuneGetMode returns the value
via a pointer rather than in the return value. The change triggered
problems with platforms where the compiler decides to use a data type of
size different than integer at the point where we typecast it.

Work around the issue by using an intermediate variable of the correct
type that gets casted back by the default typecasting rules.
---
 src/qemu/qemu_driver.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index aa0acde..2b9f125 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -10566,14 +10566,16 @@ qemuDomainGetNumaParameters(virDomainPtr dom,
         virMemoryParameterPtr param = &params[i];

         switch (i) {
-        case 0: /* fill numa mode here */
+        case 0: {  /* fill numa mode here */
+            virDomainNumatuneMemMode tmp;
+            virDomainNumatuneGetMode(def->numa, -1, &tmp);
+
             if (virTypedParameterAssign(param, VIR_DOMAIN_NUMA_MODE,
-                                        VIR_TYPED_PARAM_INT, 0) < 0)
+                                        VIR_TYPED_PARAM_INT, tmp) < 0)
                 goto cleanup;

-            virDomainNumatuneGetMode(def->numa, -1,
-                                     (virDomainNumatuneMemMode *) &param->value.i);
             break;
+        }

         case 1: /* fill numa nodeset here */
             nodeset = virDomainNumatuneFormatNodeset(def->numa, NULL, -1);


I guess we saw the same coverity report since you're fixing the code I'm
just looking at. But I think what is coverity trying to tell us is that
in all other places virDomainNumatuneGetMode() is checked for return
value, here it's not. Or did you really see problem  you're describing
in the commit message?


I think Peter is trying to fix the problem of compilation on centos 5:

https://ci.centos.org/view/libvirt-project/job/libvirt-daemon-build/systems=libvirt-centos-5/259/console

And I already had similar patch prepared, I only declared the "tmp" as
"memMode" for the whole function because switch cases with curly
brackets -- Yuck!

I'd say ACK, but I'm not sure whether Michal was trying to point out
something more that I misunderstood, so I leave it up to him.

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