linux-kernel - Re: [PATCH 3/3] mm, arch: add generic implementation of pfn

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Date:   Sat, 28 Jan 2023 18:02:13 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Brian Cain <bcain@...cinc.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Guo Ren <guoren@...nel.org>, Helge Deller <deller@....de>,
        Huacai Chen <chenhuacai@...nel.org>,
        Matt Turner <mattst88@...il.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Rich Felker <dalias@...c.org>,
        Richard Weinberger <richard@....at>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Vineet Gupta <vgupta@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux--csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-sh@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
        linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev,
        sparclinux@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 3/3] mm, arch: add generic implementation of pfn_valid()
 for FLATMEM

On Wed, Jan 25, 2023 at 09:07:57PM +0200, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
> 
> Every architecture that supports FLATMEM memory model defines its own
> version of pfn_valid() that essentially compares a pfn to max_mapnr.
> 
> Use mips/powerpc version implemented as static inline as a generic
> implementation of pfn_valid() and drop its per-architecture definitions
> 
> Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
> ---
>  arch/alpha/include/asm/page.h      |  4 ----
>  arch/arc/include/asm/page.h        |  1 -
>  arch/csky/include/asm/page.h       |  1 -
>  arch/hexagon/include/asm/page.h    |  1 -
>  arch/ia64/include/asm/page.h       |  4 ----
>  arch/loongarch/include/asm/page.h  | 13 -------------
>  arch/m68k/include/asm/page_no.h    |  2 --
>  arch/microblaze/include/asm/page.h |  1 -
>  arch/mips/include/asm/page.h       | 13 -------------
>  arch/nios2/include/asm/page.h      |  9 ---------
>  arch/openrisc/include/asm/page.h   |  2 --
>  arch/parisc/include/asm/page.h     |  4 ----
>  arch/powerpc/include/asm/page.h    |  9 ---------
>  arch/riscv/include/asm/page.h      |  5 -----
>  arch/sh/include/asm/page.h         |  3 ---
>  arch/sparc/include/asm/page_32.h   |  1 -
>  arch/um/include/asm/page.h         |  1 -
>  arch/x86/include/asm/page_32.h     |  4 ----
>  arch/x86/include/asm/page_64.h     |  4 ----
>  arch/xtensa/include/asm/page.h     |  2 --
>  include/asm-generic/memory_model.h | 12 ++++++++++++
>  include/asm-generic/page.h         |  2 --
>  22 files changed, 12 insertions(+), 86 deletions(-)
> 
[...] 
> diff --git a/arch/openrisc/include/asm/page.h b/arch/openrisc/include/asm/page.h
> index aab6e64d6db4..52b0d7e76446 100644
> --- a/arch/openrisc/include/asm/page.h
> +++ b/arch/openrisc/include/asm/page.h
> @@ -80,8 +80,6 @@ typedef struct page *pgtable_t;
>  
>  #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
>  
> -#define pfn_valid(pfn)          ((pfn) < max_mapnr)
> -
>  #define virt_addr_valid(kaddr)	(pfn_valid(virt_to_pfn(kaddr)))
>  
>  #endif /* __ASSEMBLY__ */

For OpenRISC

Acked-by: Stafford Horne <shorne@...il.com>