linux-kernel - Re: [PATCH v3 05/14] ia64: don't allow users to override ARCH_FORCE_MAX

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Date:   Wed, 19 Apr 2023 11:56:22 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Guo Ren <guoren@...nel.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Rich Felker <dalias@...c.org>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Zi Yan <ziy@...dia.com>, linux-arm-kernel@...ts.infradead.org,
        linux-csky@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mm@...ck.org, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH v3 05/14] ia64: don't allow users to override
 ARCH_FORCE_MAX_ORDER

On Sat, Mar 25, 2023 at 02:38:15PM +0800, Kefeng Wang wrote:
> 
> 
> On 2023/3/25 14:08, Mike Rapoport wrote:
> > From: "Mike Rapoport (IBM)" <rppt@...nel.org>
> > 
> > It is enough to keep default values for base and huge pages without
> > letting users to override ARCH_FORCE_MAX_ORDER.
> > 
> > Drop the prompt to make the option unvisible in *config.
> > 
> > Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> > Reviewed-by: Zi Yan <ziy@...dia.com>
> > Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
> > ---
> >   arch/ia64/Kconfig | 3 +--
> >   1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> > index 0d2f41fa56ee..b61437cae162 100644
> > --- a/arch/ia64/Kconfig
> > +++ b/arch/ia64/Kconfig
> > @@ -202,8 +202,7 @@ config IA64_CYCLONE
> >   	  If you're unsure, answer N.
> >   config ARCH_FORCE_MAX_ORDER
> > -	int "MAX_ORDER (10 - 16)"  if !HUGETLB_PAGE
> > -	range 10 16  if !HUGETLB_PAGE
> > +	int
> >   	default "16" if HUGETLB_PAGE
> >   	default "10"
> 
> It seems that we could drop the following part?

ia64 can have 64k pages, so with MAX_ORDER==16 we'd need at least 32 bits
for section size
 
> diff --git a/arch/ia64/include/asm/sparsemem.h
> b/arch/ia64/include/asm/sparsemem.h
> index a58f8b466d96..18187551b183 100644
> --- a/arch/ia64/include/asm/sparsemem.h
> +++ b/arch/ia64/include/asm/sparsemem.h
> @@ -11,11 +11,6 @@
> 
>  #define SECTION_SIZE_BITS      (30)
>  #define MAX_PHYSMEM_BITS       (50)
> -#ifdef CONFIG_ARCH_FORCE_MAX_ORDER
> -#if (CONFIG_ARCH_FORCE_MAX_ORDER + PAGE_SHIFT > SECTION_SIZE_BITS)
> -#undef SECTION_SIZE_BITS
> -#define SECTION_SIZE_BITS (CONFIG_ARCH_FORCE_MAX_ORDER + PAGE_SHIFT)
> -#endif
>  #endif
> 

-- 
Sincerely yours,
Mike.