linux-kernel - Re: [PATCH v10 06/12] powerpc: inline huge vmap supported functions

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Date:   Mon, 25 Jan 2021 09:42:08 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Nicholas Piggin <npiggin@...il.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, Zefan Li <lizefan@...wei.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Christoph Hellwig <hch@...radead.org>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v10 06/12] powerpc: inline huge vmap supported functions



Le 24/01/2021 à 09:22, Nicholas Piggin a écrit :
> This allows unsupported levels to be constant folded away, and so
> p4d_free_pud_page can be removed because it's no longer linked to.

Ah, ok, you did it here. Why not squashing this patch into patch 5 directly ?

> 
> Cc: linuxppc-dev@...ts.ozlabs.org
> Acked-by: Michael Ellerman <mpe@...erman.id.au>
> Signed-off-by: Nicholas Piggin <npiggin@...il.com>
> ---
>   arch/powerpc/include/asm/vmalloc.h       | 19 ++++++++++++++++---
>   arch/powerpc/mm/book3s64/radix_pgtable.c | 21 ---------------------
>   2 files changed, 16 insertions(+), 24 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/vmalloc.h b/arch/powerpc/include/asm/vmalloc.h
> index 105abb73f075..3f0c153befb0 100644
> --- a/arch/powerpc/include/asm/vmalloc.h
> +++ b/arch/powerpc/include/asm/vmalloc.h
> @@ -1,12 +1,25 @@
>   #ifndef _ASM_POWERPC_VMALLOC_H
>   #define _ASM_POWERPC_VMALLOC_H
>   
> +#include <asm/mmu.h>
>   #include <asm/page.h>
>   
>   #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
> -bool arch_vmap_p4d_supported(pgprot_t prot);
> -bool arch_vmap_pud_supported(pgprot_t prot);
> -bool arch_vmap_pmd_supported(pgprot_t prot);
> +static inline bool arch_vmap_p4d_supported(pgprot_t prot)
> +{
> +	return false;
> +}
> +
> +static inline bool arch_vmap_pud_supported(pgprot_t prot)
> +{
> +	/* HPT does not cope with large pages in the vmalloc area */
> +	return radix_enabled();
> +}
> +
> +static inline bool arch_vmap_pmd_supported(pgprot_t prot)
> +{
> +	return radix_enabled();
> +}
>   #endif
>   
>   #endif /* _ASM_POWERPC_VMALLOC_H */
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index 743807fc210f..8da62afccee5 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -1082,22 +1082,6 @@ void radix__ptep_modify_prot_commit(struct vm_area_struct *vma,
>   	set_pte_at(mm, addr, ptep, pte);
>   }
>   
> -bool arch_vmap_pud_supported(pgprot_t prot)
> -{
> -	/* HPT does not cope with large pages in the vmalloc area */
> -	return radix_enabled();
> -}
> -
> -bool arch_vmap_pmd_supported(pgprot_t prot)
> -{
> -	return radix_enabled();
> -}
> -
> -int p4d_free_pud_page(p4d_t *p4d, unsigned long addr)
> -{
> -	return 0;
> -}
> -
>   int pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot)
>   {
>   	pte_t *ptep = (pte_t *)pud;
> @@ -1181,8 +1165,3 @@ int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
>   
>   	return 1;
>   }
> -
> -bool arch_vmap_p4d_supported(pgprot_t prot)
> -{
> -	return false;
> -}
>