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| author | Kees Cook <keescook@chromium.org> | 2020-06-03 13:28:45 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-07-16 12:32:26 -0700 |
| commit | 1ef79040a57faa808416d6c7554babafbc34e69f (patch) | |
| tree | 7c6e5f741d744d72aa75309bb0ffeb484dba34fb /arch/powerpc/kvm/book3s_pr.c | |
| parent | fec61ff40b9e2a2439332eaca498aebe4eb5e056 (diff) | |
| download | lwn-1ef79040a57faa808416d6c7554babafbc34e69f.tar.gz lwn-1ef79040a57faa808416d6c7554babafbc34e69f.zip | |
KVM: PPC: Book3S PR: Remove uninitialized_var() usage
Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings (e.g.
"unused variable"). If the compiler thinks it is uninitialized, either
simply initialize the variable or make compiler changes. As a precursor
to removing[2] this[3] macro[4], just remove this variable since it was
actually unused:
arch/powerpc/kvm/book3s_pr.c:1832:16: warning: unused variable 'vrsave' [-Wunused-variable]
unsigned long vrsave;
^
[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Fixes: f05ed4d56e9c ("KVM: PPC: Split out code from book3s.c into book3s_pr.c")
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'arch/powerpc/kvm/book3s_pr.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_pr.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index ef54f917bdaf..ed12dfbf9bb5 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -1828,9 +1828,6 @@ static int kvmppc_vcpu_run_pr(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; int ret; -#ifdef CONFIG_ALTIVEC - unsigned long uninitialized_var(vrsave); -#endif /* Check if we can run the vcpu at all */ if (!vcpu->arch.sane) { |