Date: Wed, 24 Jun 2020 17:49:59 +0200 From: "Rafael J. Wysocki" <rjw@...ysocki.net> To: Jason Yan <yanaijie@...wei.com> Cc: lenb@...nel.org, linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org> Subject: Re: [PATCH] ACPI: Eliminate usage of uninitialized_var() macro On Monday, June 15, 2020 6:00:47 AM CEST Jason Yan wrote: > This is an effort to eliminate the uninitialized_var() macro. > > The use of this macro is the wrong solution because it forces off ANY > analysis by the compiler for a given variable. It even masks "unused > variable" warnings. > > Quoted from Linus: > > "It's a horrible thing to use, in that it adds extra cruft to the > source code, and then shuts up a compiler warning (even the _reliable_ > warnings from gcc)." > > The gcc option "-Wmaybe-uninitialized" has been disabled and this change > will not produce any warnnings even with "make W=1". > >  https://github.com/KSPP/linux/issues/81 >  https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ > > Cc: Kees Cook <keescook@...omium.org> > Signed-off-by: Jason Yan <yanaijie@...wei.com> > --- > drivers/acpi/acpi_pad.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c > index e7dc0133f817..6cc4c92d9ff9 100644 > --- a/drivers/acpi/acpi_pad.c > +++ b/drivers/acpi/acpi_pad.c > @@ -88,7 +88,7 @@ static void round_robin_cpu(unsigned int tsk_index) > cpumask_var_t tmp; > int cpu; > unsigned long min_weight = -1; > - unsigned long uninitialized_var(preferred_cpu); > + unsigned long preferred_cpu; > > if (!alloc_cpumask_var(&tmp, GFP_KERNEL)) > return; > Applied as 5.9 material, thanks!
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