linux-kernel - Re: [PATCH v17 01/10] x86: kdump: replace the hard-coded alignment with macro CRASH

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Date:   Mon, 13 Dec 2021 08:26:29 -0600
From:   john.p.donnelly@...cle.com
To:     Zhen Lei <thunder.leizhen@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org, Dave Young <dyoung@...hat.com>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        kexec@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>
Subject: Re: [PATCH v17 01/10] x86: kdump: replace the hard-coded alignment
 with macro CRASH_ALIGN

On 12/10/21 12:55 AM, Zhen Lei wrote:
> From: Chen Zhou <chenzhou10@...wei.com>
> 
> Move CRASH_ALIGN to header asm/kexec.h for later use.
> 
> Suggested-by: Dave Young <dyoung@...hat.com>
> Suggested-by: Baoquan He <bhe@...hat.com>
> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> Tested-by: John Donnelly <John.p.donnelly@...cle.com>
> Tested-by: Dave Kleikamp <dave.kleikamp@...cle.com>
 >
  Acked-by: John Donnelly <john.p.donnelly@...cle.com>


> ---
>   arch/x86/include/asm/kexec.h | 3 +++
>   arch/x86/kernel/setup.c      | 3 ---
>   2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
> index 11b7c06e2828c30..3a22e65262aa70b 100644
> --- a/arch/x86/include/asm/kexec.h
> +++ b/arch/x86/include/asm/kexec.h
> @@ -18,6 +18,9 @@
>   
>   # define KEXEC_CONTROL_CODE_MAX_SIZE	2048
>   
> +/* 16M alignment for crash kernel regions */
> +#define CRASH_ALIGN		SZ_16M
> +
>   #ifndef __ASSEMBLY__
>   
>   #include <linux/string.h>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 6a190c7f4d71b05..5cc60996eac56d6 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -392,9 +392,6 @@ static void __init memblock_x86_reserve_range_setup_data(void)
>   
>   #ifdef CONFIG_KEXEC_CORE
>   
> -/* 16M alignment for crash kernel regions */
> -#define CRASH_ALIGN		SZ_16M
> -
>   /*
>    * Keep the crash kernel below this limit.
>    *