linux-kernel - Re: [PATCH v5 15/32] efi: Update efi_mem_type() to return an error rather than 0

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Message-ID: <20170507171822.x7grrqg2tcvbv6j5@pd.tnic>
Date:   Sun, 7 May 2017 19:18:22 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org, Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dave Young <dyoung@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v5 15/32] efi: Update efi_mem_type() to return an error
 rather than 0

On Tue, Apr 18, 2017 at 04:19:00PM -0500, Tom Lendacky wrote:
> The efi_mem_type() function currently returns a 0, which maps to
> EFI_RESERVED_TYPE, if the function is unable to find a memmap entry for
> the supplied physical address. Returning EFI_RESERVED_TYPE implies that
> a memmap entry exists, when it doesn't.  Instead of returning 0, change
> the function to return a negative error value when no memmap entry is
> found.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---

...

> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index cd768a1..a27bb3f 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -973,7 +973,7 @@ static inline void efi_esrt_init(void) { }
>  extern int efi_config_parse_tables(void *config_tables, int count, int sz,
>  				   efi_config_table_type_t *arch_tables);
>  extern u64 efi_get_iobase (void);
> -extern u32 efi_mem_type (unsigned long phys_addr);
> +extern int efi_mem_type (unsigned long phys_addr);

WARNING: space prohibited between function name and open parenthesis '('
#101: FILE: include/linux/efi.h:976:
+extern int efi_mem_type (unsigned long phys_addr);

Please integrate scripts/checkpatch.pl in your patch creation workflow.
Some of the warnings/errors *actually* make sense.

I know, the other function prototypes have a space too but that's not
our coding style. Looks like this trickled in from ia64, from looking at
arch/ia64/kernel/efi.c.

-- 
Regards/Gruss,
    Boris.

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