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    SubjectRe: [PATCH 04/19] powerpc/kvm: Mark variable tmp unused
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    Le 22/03/2018 à 21:19, Mathieu Malaterre a écrit :
    > Add gcc attribute unused to variable tmp. Fix warning treated as error with
    > W=1:
    >
    > arch/powerpc/kernel/kvm.c:675:6: error: variable ‘tmp’ set but not used [-Werror=unused-but-set-variable]
    >
    > Signed-off-by: Mathieu Malaterre <malat@debian.org>
    > ---
    > arch/powerpc/kernel/kvm.c | 2 +-
    > 1 file changed, 1 insertion(+), 1 deletion(-)
    >
    > diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
    > index 9ad37f827a97..cd3c088283f9 100644
    > --- a/arch/powerpc/kernel/kvm.c
    > +++ b/arch/powerpc/kernel/kvm.c
    > @@ -672,7 +672,7 @@ static void kvm_use_magic_page(void)
    > {
    > u32 *p;
    > u32 *start, *end;
    > - u32 tmp;
    > + u32 tmp __maybe_unused;
    > u32 features;
    >
    > /* Tell the host to map the magic page to -4096 on all CPUs */
    >

    This fonction should use fault_in_pages_readable() instead of
    hardcoding the verification.

    Christophe

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