linux-kernel - Re: [PATCH 2/2] x86/mm: Remove duplicate definition of _PAGE_PAT

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Date:   Tue, 5 Jan 2021 14:17:25 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/mm: Remove duplicate definition of
 _PAGE_PAT_LARGE

On 1/5/21 1:28 PM, Arvind Sankar wrote:
> diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
> index 394757ee030a..f24d7ef8fffa 100644
> --- a/arch/x86/include/asm/pgtable_types.h
> +++ b/arch/x86/include/asm/pgtable_types.h
> @@ -177,8 +177,6 @@ enum page_cache_mode {
>  #define __pgprot(x)		((pgprot_t) { (x) } )
>  #define __pg(x)			__pgprot(x)
>  
> -#define _PAGE_PAT_LARGE		(_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)

Huh, I didn't realize that duplicate #defines were allowed.  Guess you
learn something new every day.  This looks fine to me, it removes the
exact dup that Ingo appears to have added.

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>