Re: [PATCH 1/2] x86/bootflag: Change some static functions to bool

[Jiri Slaby]

On 24. 02. 25, 8:24, Uros Bizjak wrote:
> On Mon, Feb 24, 2025 at 8:18 AM Jiri Slaby <jirislaby@xxxxxxxxxx> wrote:
> > On 29. 01. 25, 16:47, Uros Bizjak wrote:
> > > The return values of some functions are of boolean type. Change the
> > > type of these function to bool and adjust their return values.
> > >
> > > No functional change intended.
> > >
> > > Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
> > > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > > Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> > > Cc: Borislav Petkov <bp@xxxxxxxxx>
> > > Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> > > Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> > > ---
> > >    arch/x86/kernel/bootflag.c | 12 ++++++------
> > >    1 file changed, 6 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/arch/x86/kernel/bootflag.c b/arch/x86/kernel/bootflag.c
> > > index 3fed7ae58b60..4d89a2d80d0f 100644
> > > --- a/arch/x86/kernel/bootflag.c
> > > +++ b/arch/x86/kernel/bootflag.c
> > > @@ -20,7 +20,7 @@
> > >
> > >    int sbf_port __initdata = -1;       /* set via acpi_boot_init() */
> > >
> > > -static int __init parity(u8 v)
> > > +static bool __init parity(u8 v)
> > >    {
> > >        int x = 0;
> > >        int i;
> > > @@ -30,7 +30,7 @@ static int __init parity(u8 v)
> > >                v >>= 1;
> > >        }
> > >
> > > -     return x;
> > > +     return !!x;
> >
> > This "!!" is unnecessary and only obfuscates the code, right?
>
> Not really, this idiom is used in place of (x != 0) to change the type
> to the return type of the function in a pedantic way.

Care to explain what exactly it changes?

--
js
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