linux-kernel - Re: [PATCH] mm: Speed up mremap on large regions

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Date:   Thu, 11 Oct 2018 08:14:19 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-team@...roid.com, minchan@...gle.com, hughd@...gle.com,
        lokeshgidra@...gle.com, Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] mm: Speed up mremap on large regions

On Wed, Oct 10, 2018 at 05:46:18PM -0700, Joel Fernandes wrote:
> diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h
> index 391ed2c3b697..8a33f2044923 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgalloc.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h
> @@ -192,14 +192,12 @@ static inline pgtable_t pmd_pgtable(pmd_t pmd)
>  	return (pgtable_t)pmd_page_vaddr(pmd);
>  }
>  
> -static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
> -					  unsigned long address)
> +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
>  {
>  	return (pte_t *)pte_fragment_alloc(mm, address, 1);
>  }

This is obviously broken.

-- 
 Kirill A. Shutemov