linux-kernel - Re: [PATCH v13 1/8] x86: kdump: replace the hard-coded alignment with macro CRASH

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Date:   Thu, 12 Nov 2020 16:12:07 +0800
From:   chenzhou <chenzhou10@...wei.com>
To:     Mike Rapoport <rppt@...nel.org>
CC:     <tglx@...utronix.de>, <mingo@...hat.com>, <dyoung@...hat.com>,
        <bhe@...hat.com>, <catalin.marinas@....com>, <will@...nel.org>,
        <corbet@....net>, <John.P.donnelly@...cle.com>,
        <bhsharma@...hat.com>, <prabhakar.pkin@...il.com>,
        <horms@...ge.net.au>, <robh+dt@...nel.org>, <arnd@...db.de>,
        <nsaenzjulienne@...e.de>, <james.morse@....com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kexec@...ts.infradead.org>, <linux-doc@...r.kernel.org>,
        <xiexiuqi@...wei.com>, <guohanjun@...wei.com>,
        <huawei.libin@...wei.com>, <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH v13 1/8] x86: kdump: replace the hard-coded alignment with
 macro CRASH_ALIGN



On 2020/11/12 15:58, Mike Rapoport wrote:
> Hi,
>
> On Sat, Oct 31, 2020 at 03:44:30PM +0800, Chen Zhou wrote:
>> Move CRASH_ALIGN to header asm/kexec.h and replace the hard-coded
>> alignment with macro CRASH_ALIGN in function reserve_crashkernel().
>>
>> Suggested-by: Dave Young <dyoung@...hat.com>
>> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
>> Tested-by: John Donnelly <John.p.donnelly@...cle.com>
>> ---
>>  arch/x86/include/asm/kexec.h | 3 +++
>>  arch/x86/kernel/setup.c      | 5 +----
>>  2 files changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h
>> index 6802c59e8252..8cf9d3fd31c7 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
>>  
>> +/* 2M alignment for crash kernel regions */
>> +#define CRASH_ALIGN		SZ_16M
> Please update the comment to match the code.
Ok, thanks for pointing this mistake.

Thanks,
Chen Zhou
>
>> +
>>  #ifndef __ASSEMBLY__
>>  
>>  #include <linux/string.h>
>> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>> index 84f581c91db4..bf373422dc8a 100644
>> --- a/arch/x86/kernel/setup.c
>> +++ b/arch/x86/kernel/setup.c
>> @@ -395,9 +395,6 @@ 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.
>>   *
>> @@ -515,7 +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_ALIGN, crash_base,
>>  						  crash_base + crash_size);
>>  		if (start != crash_base) {
>>  			pr_info("crashkernel reservation failed - memory is in use.\n");
>> -- 
>> 2.20.1
>>