linux-kernel - Re: [PATCH 12/12] efi: make const array 'apple' static

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Message-ID: <1520588221.11634.26.camel@perches.com>
Date:   Fri, 09 Mar 2018 01:37:01 -0800
From:   Joe Perches <joe@...ches.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     linux-efi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Colin Ian King <colin.king@...onical.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/12] efi: make const array 'apple' static

On Fri, 2018-03-09 at 07:44 +0000, Ard Biesheuvel wrote:
> On 9 March 2018 at 07:43, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> > On 8 March 2018 at 11:05, Joe Perches <joe@...ches.com> wrote:
> > > On Thu, 2018-03-08 at 08:00 +0000, Ard Biesheuvel wrote:
> > > > From: Colin Ian King <colin.king@...onical.com>
> > > > 
> > > > Don't populate the const read-only array 'buf' on the stack but instead
> > > > make it static. Makes the object code smaller by 64 bytes:
> > > > 
> > > > Before:
> > > >    text          data     bss     dec     hex filename
> > > >    9264             1      16    9281    2441 arch/x86/boot/compressed/eboot.o
> > > > 
> > > > After:
> > > >    text          data     bss     dec     hex filename
> > > >    9200             1      16    9217    2401 arch/x86/boot/compressed/eboot.o
> > > > 
> > > > (gcc version 7.2.0 x86_64)
> > > > 
> > > > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > > > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> > > > ---
> > > >  arch/x86/boot/compressed/eboot.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
> > > > index 886a9115af62..f2251c1c9853 100644
> > > > --- a/arch/x86/boot/compressed/eboot.c
> > > > +++ b/arch/x86/boot/compressed/eboot.c
> > > > @@ -423,7 +423,7 @@ static void retrieve_apple_device_properties(struct boot_params *boot_params)
> > > > 
> > > >  static void setup_quirks(struct boot_params *boot_params)
> > > >  {
> > > > -     efi_char16_t const apple[] = { 'A', 'p', 'p', 'l', 'e', 0 };
> > > > +     static efi_char16_t const apple[] = { 'A', 'p', 'p', 'l', 'e', 0 };
> > > 
> > > Perhaps
> > > 
> > > static const efi_char16_t apple[] ...
> > > 
> > > is better.
> > > 
> > 
> > Why would that be any better?

It'd be more like the the style used
in the rest of the kernel.