linux-kernel - Re: [PATCH v7 15/15] KVM: arm64: selftests: arch

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Date:   Mon, 4 Oct 2021 11:23:24 -0700
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Andrew Jones <drjones@...hat.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kvm@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>,
        Peter Shier <pshier@...gle.com>, linux-kernel@...r.kernel.org,
        Will Deacon <will@...nel.org>, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 15/15] KVM: arm64: selftests: arch_timer: Support vCPU migration

On Thu, Sep 30, 2021 at 2:41 AM Zenghui Yu <yuzenghui@...wei.com> wrote:
>
> On 2021/9/15 6:31, Raghavendra Rao Ananta wrote:
> >  static void test_run(struct kvm_vm *vm)
> >  {
> >       int i, ret;
> > +     pthread_t pt_vcpu_migration;
> > +
> > +     pthread_mutex_init(&vcpu_done_map_lock, NULL);
> > +     vcpu_done_map = bitmap_alloc(test_args.nr_vcpus);
>
> This one fails to build.
>
> aarch64/arch_timer.c: In function 'test_run':
> aarch64/arch_timer.c:321:18: warning: implicit declaration of function
> 'bitmap_alloc'; did you mean 'bitmap_zalloc'?
> [-Wimplicit-function-declaration]
>    vcpu_done_map = bitmap_alloc(test_args.nr_vcpus);
>                    ^~~~~~~~~~~~
>                    bitmap_zalloc
> aarch64/arch_timer.c:321:16: warning: assignment makes pointer from
> integer without a cast [-Wint-conversion]
>    vcpu_done_map = bitmap_alloc(test_args.nr_vcpus);
>                  ^

bitmap_alloc() is defined as an inline function in
tools/include/linux/bitmap.h (since 4.8), which is included as a part
of this patch. Do you mind double-checking if you have it in the
header file?
Also, the function is referenced by other tests such as
dirty_log_[perf_]]test.c. Do you see the same warnings when you
compile them too?

Regards,
Raghavendra