KVM build warnings

From: Borislav Petkov
Date: Mon May 30 2011 - 05:46:14 EST


I get the following

In file included from arch/x86/kvm/mmu.c:2856:
arch/x86/kvm/paging_tmpl.h: In function âpaging32_walk_addr_genericâ:
arch/x86/kvm/paging_tmpl.h:124: warning: âptep_userâ may be used uninitialized in this function
In file included from arch/x86/kvm/mmu.c:2852:
arch/x86/kvm/paging_tmpl.h: In function âpaging64_walk_addr_genericâ:
arch/x86/kvm/paging_tmpl.h:124: warning: âptep_userâ may be used uninitialized in this function

when building -rc1. It looks like it is caused by
6e2ca7d1802bf8ed9908435e34daa116662e7790 and sticking uninitialized_var() around
the ptep_user declaration looks like the easiest solution. But the code should
still be audited by someone who's familiar with it whether shutting up the
compiler doesn't cause an actual bug.

Thanks.

--
Regards/Gruss,
Boris.
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