linux-kernel - Re: [PATCH v3 02/14] arm64: drop ranges in definition of ARCH_FORCE_MAX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c4a228ea-a438-a442-b2be-ee46510124e2@huawei.com>
Date:   Sat, 25 Mar 2023 14:35:17 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     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 02/14] arm64: drop ranges in definition of
 ARCH_FORCE_MAX_ORDER



On 2023/3/25 14:08, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
> 
> It is not a good idea to change fundamental parameters of core memory
> management. Having predefined ranges suggests that the values within
> those ranges are sensible, but one has to *really* understand
> implications of changing MAX_ORDER before actually amending it and
> ranges don't help here.
> 
> Drop ranges in definition of ARCH_FORCE_MAX_ORDER and make its prompt
> visible only if EXPERT=y
> 
> 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>

Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>

> ---
>   arch/arm64/Kconfig | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index e60baf7859d1..7324032af859 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1487,11 +1487,9 @@ config XEN
>   # 16K |       27          |      14      |       13        |         11         |
>   # 64K |       29          |      16      |       13        |         13         |
>   config ARCH_FORCE_MAX_ORDER
> -	int "Maximum zone order" if ARM64_4K_PAGES || ARM64_16K_PAGES
> +	int "Maximum zone order" if EXPERT && (ARM64_4K_PAGES || ARM64_16K_PAGES)
>   	default "13" if ARM64_64K_PAGES
> -	range 11 13 if ARM64_16K_PAGES
>   	default "11" if ARM64_16K_PAGES
> -	range 10 15 if ARM64_4K_PAGES
>   	default "10"
>   	help
>   	  The kernel memory allocator divides physically contiguous memory