linux-kernel - Re: [PATCH 6/6] efi: Add EFI_SECURE

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Date:   Wed, 23 Nov 2016 10:09:30 +0000
From:   David Howells <dhowells@...hat.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     dhowells@...hat.com, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Josh Boyer <jwboyer@...oraproject.org>,
        keyrings@...r.kernel.org
Subject: Re: [PATCH 6/6] efi: Add EFI_SECURE_BOOT bit [ver #2]

David Howells <dhowells@...hat.com> wrote:

> > > +#ifdef CONFIG_EFI
> > > +	if (boot_params.secure_boot) {
> > > +		set_bit(EFI_SECURE_BOOT, &efi.flags);
> > > +		pr_info("Secure boot enabled\n");
> > > +	}
> > > +#endif
> > > +
> > 
> > Section 20 of Documentation/CodingStyle recommends IS_ENABLED()
> > instead of #ifdef.
> 
> The problem is this:
> 
> 	arch/x86/include/asm/bitops.h:75: undefined reference to `efi'
> 
> To quote section 20: "... Thus, you still have to use an #ifdef if the code
> inside the block references symbols that will not exist if the condition is
> not met."

Okay, I take that back - it does actually work.  However, should I follow the
scheme of the rest of the file?

David