linux-kernel - Re: [PATCH v19 05/13] x86/setup: Add and use CRASH_BASE

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Date:   Tue, 11 Jan 2022 09:06:00 -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 v19 05/13] x86/setup: Add and use CRASH_BASE_ALIGN

On 12/28/21 7:26 AM, Zhen Lei wrote:
> Add macro CRASH_BASE_ALIGN to indicate the alignment for crash kernel
> fixed region, in preparation for making partial implementation of
> reserve_crashkernel[_low]() generic.
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>

 >
Acked-by: John Donnelly  <john.p.donnelly@...cle.com>

> ---
>   arch/x86/kernel/setup.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 93d78aae1937db3..cb7f237a2ae0dfa 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -392,9 +392,12 @@ static void __init memblock_x86_reserve_range_setup_data(void)
>   
>   #ifdef CONFIG_KEXEC_CORE
>   
> -/* 16M alignment for crash kernel regions */
> +/* alignment for crash kernel dynamic regions */
>   #define CRASH_ALIGN		SZ_16M
>   
> +/* alignment for crash kernel fixed region */
> +#define CRASH_BASE_ALIGN	SZ_1M
> +
>   /*
>    * Keep the crash kernel below this limit.
>    *
> @@ -509,7 +512,7 @@ static void __init reserve_crashkernel(void)
>   	} else {
>   		unsigned long long start;
>   
> -		start = memblock_phys_alloc_range(crash_size, SZ_1M, crash_base,
> +		start = memblock_phys_alloc_range(crash_size, CRASH_BASE_ALIGN, crash_base,
>   						  crash_base + crash_size);
>   		if (start != crash_base) {
>   			pr_info("crashkernel reservation failed - memory is in use.\n");