Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index

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To: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Subject: Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index
From: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Date: Wed, 20 Jan 2021 14:26:43 +0300
Cc: Borislav Petkov <bp@xxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, Nathan Chancellor <natechancellor@xxxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Darren Hart <dvhart@xxxxxxxxxxxxx>, Andy Shevchenko <andy@xxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, linux-efi <linux-efi@xxxxxxxxxxxxxxx>, platform-driver-x86@xxxxxxxxxxxxxxx, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, clang-built-linux <clang-built-linux@xxxxxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
In-reply-to: <YAYAvBARSRSg8z8G@rani.riverdale.lan>
References: <20210107223424.4135538-1-arnd@kernel.org> <YAHoB4ODvxSqNhsq@rani.riverdale.lan> <YAH6r3lak/F2wndp@rani.riverdale.lan> <CAMj1kXGZFZciN1_KruCr=g6GANNpRrCLR48b3q13+QfK481C7Q@mail.gmail.com> <20210118202409.GG30090@zn.tnic> <YAYAvBARSRSg8z8G@rani.riverdale.lan>

On Mon, Jan 18, 2021 at 04:42:20PM -0500, Arvind Sankar wrote:
> AFAICT, MODULES_END is only relevant as being something that happens to
> be in the top 512GiB, and -1ul would be clearer.

I think you are right. But -1UL is not very self-descriptive. :/

-- 
 Kirill A. Shutemov

References:
- [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index
  - From: Arnd Bergmann
- Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index
  - From: Arvind Sankar
- Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index
  - From: Arvind Sankar
- Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index
  - From: Ard Biesheuvel
- Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index
  - From: Borislav Petkov
- Re: [PATCH] x86: efi: avoid BUILD_BUG_ON() for non-constant p4d_index
  - From: Arvind Sankar

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