Re: [Xen-devel] x86_64 SLES 9 SP2 build break

[David F Barrera <dfbp@xxxxxxxxxx>]

It seems that the x86_64 build still broken on FC4. It built on SLES 9, 
but I got the following error on FC4:
gcc -nostdinc -fno-builtin -fno-common -fno-strict-aliasing -iwithprefix 
include -Wall -Werror -Wno-pointer-arith -pipe 
-I/tmp/xen-unstable.hg/xen/include 
-I/tmp/xen-unstable.hg/xen/include/asm-x86/mach-generic 
-I/tmp/xen-unstable.hg/xen/include/asm-x86/mach-default -O3 
-fomit-frame-pointer -msoft-float -m64 -mno-red-zone -fpic 
-fno-reorder-blocks -fno-asynchronous-unwind-tables -DNDEBUG -DVERBOSE 
-c physdev.c -o physdev.o
cc1: warnings being treated as errors
physdev.c: In function âdo_physdev_opâ:
physdev.c:109: warning: pointer targets in assignment differ in signedness
make[3]: *** [physdev.o] Error 1
make[3]: Leaving directory `/tmp/xen-unstable.hg/xen/arch/x86'
make[2]: *** [/tmp/xen-unstable.hg/xen/xen] Error 2
make[2]: Leaving directory `/tmp/xen-unstable.hg/xen'
make[1]: *** [xen] Error 2
make[1]: Leaving directory `/tmp/xen-unstable.hg'
make: *** [world] Error 2


Nakajima, Jun wrote:

> Ryan Harper wrote:
>  
>
> > > > You need x86_64 to run ASAP, not HOTPLUG_CPU for x86_64 smp,
> > > > correct? 
> > > >        
> > > No, we _do_ need HOTPLUG_CPU for x86_64 smp. The build problem is
> > > not a big deal.
> > >      
> > Ah. OK.  I don't think it will be a problem for Xen, but currently in
> > plain linux-2.6.13-rc6 (which has x86_64 HOTPLUG_CPU support),
> > support is non-functional, at least on my two-way Opteron box.  I can
> > remove a cpu (echo 0 > /sys/devices/system/cpu/cpu1/online) fine, but
> > when I try to restore (echo 1), the processor fails to come back. 
> > Part of this is that they are integrating the physical hotplug
> > support which requires a full reboot of the processor (a second run
> > through do_boot_cpu()) since it would have been physically removed.  
> > I really wanted to see HOTPLUG_CPU work on plain Linux before
> > bringing the code into XenLinux, but the issues may be tied up in
> > code that Xen doesn't need.  The hypervisor will have to support
> > physical hotplug before XenLinux will need it.
> >    
> That's right. As long as we handle VCPU, that should be Xen-specific and
> common between x86 and x86_64 (although smp.c & smpboot.c are slightly
> different there at this point).
>
>  
>
> > There are some other subtle differences in HOTPLUG_CPU in the newer
> > 2.6.13 series for x86_64 compared to the level of HOTPLUG_CPU we have
> > patched into the 2.6.12 tree.
> >
> > I'll go ahead and work up a patch that brings in HOTPLUG_CPU for
> > x86_64 and share that so we both can work on getting it working.
> >    
> Great. 
>
> Jun
> ---
> Intel Open Source Technology Center
>
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>  
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