On Mon, May 18, 2020 at 2:31 AM Nathan Chancellor
<natechancellor@xxxxxxxxx> wrote:
>
> On Wed, Apr 08, 2020 at 01:53:23PM -0700, Nathan Chancellor wrote:
> > When building with Clang + -Wtautological-compare and
> > CONFIG_CPUMASK_OFFSTACK unset:
> >
> > arch/x86/mm/mmio-mod.c:375:6: warning: comparison of array 'downed_cpus'
> > equal to a null pointer is always false [-Wtautological-pointer-compare]
> > if (downed_cpus == NULL &&
> > ^~~~~~~~~~~ ~~~~
> > arch/x86/mm/mmio-mod.c:405:6: warning: comparison of array 'downed_cpus'
> > equal to a null pointer is always false [-Wtautological-pointer-compare]
> > if (downed_cpus == NULL || cpumask_weight(downed_cpus) == 0)
> > ^~~~~~~~~~~ ~~~~
> > 2 warnings generated.
> >
> > Commit f7e30f01a9e2 ("cpumask: Add helper cpumask_available()") added
> > cpumask_available to fix warnings of this nature. Use that here so that
> > clang does not warn regardless of CONFIG_CPUMASK_OFFSTACK's value.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/982
> > Reported-by: Sedat Dilek <sedat.dilek@xxxxxxxxx>
> > Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Thanks for the patch, sorry I'm falling behind on code review!
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
> > ---
> > arch/x86/mm/mmio-mod.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c
> > index 109325d77b3e..43fd19b3f118 100644
> > --- a/arch/x86/mm/mmio-mod.c
> > +++ b/arch/x86/mm/mmio-mod.c
> > @@ -372,7 +372,7 @@ static void enter_uniprocessor(void)
> > int cpu;
> > int err;
> >
> > - if (downed_cpus == NULL &&
> > + if (!cpumask_available(downed_cpus) &&
> > !alloc_cpumask_var(&downed_cpus, GFP_KERNEL)) {
> > pr_notice("Failed to allocate mask\n");
> > goto out;
> > @@ -402,7 +402,7 @@ static void leave_uniprocessor(void)
> > int cpu;
> > int err;
> >
> > - if (downed_cpus == NULL || cpumask_weight(downed_cpus) == 0)
> > + if (!cpumask_available(downed_cpus) || cpumask_weight(downed_cpus) == 0)
> > return;
> > pr_notice("Re-enabling CPUs...\n");
> > for_each_cpu(cpu, downed_cpus) {
> >
> > base-commit: ae46d2aa6a7fbe8ca0946f24b061b6ccdc6c3f25
> > --
> > 2.26.0
> >
>
> Gentle ping for acceptance, I am not sure who should take this.
Looks like Steven or Ingo are the listed maintainers for MMIOTRACE?
--
Thanks,
~Nick Desaulniers
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