linux-kernel - Re: [PATCH] x86, efi: print debug values in Kib not MB

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Date:	Tue, 29 Jul 2014 13:29:10 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Prarit Bhargava <prarit@...hat.com>
cc:	linux-kernel@...r.kernel.org, lszubowi@...hat.com,
	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH] x86, efi: print debug values in Kib not MB

On Tue, 29 Jul 2014, Prarit Bhargava wrote:

> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 87fc96b..3875090 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -384,10 +384,10 @@ static void __init print_efi_memmap(void)
>  	     p < memmap.map_end;
>  	     p += memmap.desc_size, i++) {
>  		md = p;
> -		pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n",
> +		pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluKiB)\n",
>  			i, md->type, md->attribute, md->phys_addr,
>  			md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
> -			(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
> +			(md->num_pages << 2));
>  	}
>  #endif  /*  EFI_DEBUG  */
>  }

If EFI_PAGE_SHIFT were to ever change from its hard-coded 12, then this 
would be wrong.  Any reason to not simply print EFI_PAGE_SIZE and 
md->num_pages?
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