linux-kernel - Re: [PATCH] x86/mm: fix regression with huge pages on PAE

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Date:	Tue, 10 Nov 2015 13:34:29 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, jgross@...e.com,
	konrad.wilk@...cle.com, elliott@....com,
	boris.ostrovsky@...cle.com, Toshi Kani <toshi.kani@....com>
Subject: Re: [PATCH] x86/mm: fix regression with huge pages on PAE

On Tue, Nov 10, 2015 at 01:18:10AM +0200, Kirill A. Shutemov wrote:
> diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
> index dd5b0aa9dd2f..c1e797266ce9 100644
> --- a/arch/x86/include/asm/pgtable_types.h
> +++ b/arch/x86/include/asm/pgtable_types.h
> @@ -279,17 +279,14 @@ static inline pmdval_t native_pmd_val(pmd_t pmd)
>  static inline pudval_t pud_pfn_mask(pud_t pud)
>  {
>  	if (native_pud_val(pud) & _PAGE_PSE)
> -		return PUD_PAGE_MASK & PHYSICAL_PAGE_MASK;
> +		return ~((1ULL << PUD_SHIFT) - 1) & PHYSICAL_PAGE_MASK;

In file included from ./arch/x86/include/asm/boot.h:5:0,
                 from ./arch/x86/boot/boot.h:26,
                 from arch/x86/realmode/rm/wakemain.c:2:
./arch/x86/include/asm/pgtable_types.h: In function ‘pud_pfn_mask’:
./arch/x86/include/asm/pgtable_types.h:282:10: warning: large integer implicitly truncated to unsigned type [-Woverflow]
   return ~((1ULL << PUD_SHIFT) - 1) & PHYSICAL_PAGE_MASK;
          ^
./arch/x86/include/asm/pgtable_types.h: In function ‘pmd_pfn_mask’:
./arch/x86/include/asm/pgtable_types.h:300:10: warning: large integer implicitly truncated to unsigned type [-Woverflow]
   return ~((1ULL << PMD_SHIFT) - 1) & PHYSICAL_PAGE_MASK;
          ^
In file included from ./arch/x86/include/asm/boot.h:5:0,
                 from arch/x86/realmode/rm/../../boot/boot.h:26,
                 from arch/x86/realmode/rm/../../boot/video-mode.c:18,
                 from arch/x86/realmode/rm/video-mode.c:1:
./arch/x86/include/asm/pgtable_types.h: In function ‘pud_pfn_mask’:
./arch/x86/include/asm/pgtable_types.h:282:10: warning: large integer implicitly truncated to unsigned type [-Woverflow]
   return ~((1ULL << PUD_SHIFT) - 1) & PHYSICAL_PAGE_MASK;
          ^
...

That's a 64-bit config.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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