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Subject: Re: [PATCH 12/15] powerpc/nohash/64: switch to generic version of pte
 allocation
To:     Mike Rapoport <rppt@linux.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     Michal Hocko <mhocko@suse.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Palmer Dabbelt <palmer@sifive.com>, linux-mips@vger.kernel.org,
        Guo Ren <guoren@kernel.org>, linux-hexagon@vger.kernel.org,
        linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org,
        Helge Deller <deller@gmx.de>, x86@kernel.org,
        Russell King <linux@armlinux.org.uk>,
        Matthew Wilcox <willy@infradead.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Matt Turner <mattst88@gmail.com>,
        Sam Creasey <sammy@sammy.net>, Arnd Bergmann <arnd@arndb.de>,
        linux-um@lists.infradead.org, Richard Weinberger <richard@nod.at>,
        linux-m68k@lists.linux-m68k.org, Greentime Hu <green.hu@gmail.com>,
        nios2-dev@lists.rocketboards.org, Guan Xuetao <gxt@pku.edu.cn>,
        linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org,
        linux-kernel@vger.kernel.org, Richard Kuo <rkuo@codeaurora.org>,
        Paul Burton <paul.burton@mips.com>,
        linux-alpha@vger.kernel.org, Ley Foon Tan <lftan@altera.com>,
        linuxppc-dev@lists.ozlabs.org
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 <1556810922-20248-13-git-send-email-rppt@linux.ibm.com>
From:   Christophe Leroy <christophe.leroy@c-s.fr>
Message-ID: <adcb6ae6-48d9-5ba9-2732-a0ab1d96667c@c-s.fr>
Date:   Thu, 2 May 2019 18:56:07 +0200
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Le 02/05/2019 à 17:28, Mike Rapoport a écrit :
> The 64-bit book-E powerpc implements pte_alloc_one(),
> pte_alloc_one_kernel(), pte_free_kernel() and pte_free() the same way as
> the generic version.

Will soon be converted to the same as the 3 other PPC subarches, see
https://patchwork.ozlabs.org/patch/1091590/

Christophe

> 
> Switch it to the generic version that does exactly the same thing.
> 
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
>   arch/powerpc/include/asm/nohash/64/pgalloc.h | 35 ++--------------------------
>   1 file changed, 2 insertions(+), 33 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/nohash/64/pgalloc.h b/arch/powerpc/include/asm/nohash/64/pgalloc.h
> index 66d086f..bfb53a0 100644
> --- a/arch/powerpc/include/asm/nohash/64/pgalloc.h
> +++ b/arch/powerpc/include/asm/nohash/64/pgalloc.h
> @@ -11,6 +11,8 @@
>   #include <linux/cpumask.h>
>   #include <linux/percpu.h>
>   
> +#include <asm-generic/pgalloc.h>	/* for pte_{alloc,free}_one */
> +
>   struct vmemmap_backing {
>   	struct vmemmap_backing *list;
>   	unsigned long phys;
> @@ -92,39 +94,6 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
>   	kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
>   }
>   
> -
> -static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
> -{
> -	return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
> -}
> -
> -static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
> -{
> -	struct page *page;
> -	pte_t *pte;
> -
> -	pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
> -	if (!pte)
> -		return NULL;
> -	page = virt_to_page(pte);
> -	if (!pgtable_page_ctor(page)) {
> -		__free_page(page);
> -		return NULL;
> -	}
> -	return page;
> -}
> -
> -static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
> -{
> -	free_page((unsigned long)pte);
> -}
> -
> -static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
> -{
> -	pgtable_page_dtor(ptepage);
> -	__free_page(ptepage);
> -}
> -
>   static inline void pgtable_free(void *table, int shift)
>   {
>   	if (!shift) {
>