linux-kernel - Re: [PATCH v14 09/11] x86, arm64: Add ARCH_WANT_RESERVE_CRASH

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Message-ID: <785d0e3c-9540-44b3-0682-877510007977@huawei.com>
Date:   Sat, 20 Feb 2021 11:22:47 +0800
From:   chenzhou <chenzhou10@...wei.com>
To:     Baoquan He <bhe@...hat.com>
CC:     <mingo@...hat.com>, <tglx@...utronix.de>, <rppt@...nel.org>,
        <dyoung@...hat.com>, <catalin.marinas@....com>, <will@...nel.org>,
        <nsaenzjulienne@...e.de>, <corbet@....net>,
        <John.P.donnelly@...cle.com>, <prabhakar.pkin@...il.com>,
        <horms@...ge.net.au>, <robh+dt@...nel.org>, <arnd@...db.de>,
        <james.morse@....com>, <xiexiuqi@...wei.com>,
        <guohanjun@...wei.com>, <huawei.libin@...wei.com>,
        <wangkefeng.wang@...wei.com>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kexec@...ts.infradead.org>
Subject: Re: [PATCH v14 09/11] x86, arm64: Add ARCH_WANT_RESERVE_CRASH_KERNEL
 config



On 2021/2/18 16:35, Baoquan He wrote:
> On 01/30/21 at 03:10pm, Chen Zhou wrote:
>> We make the functions reserve_crashkernel[_low]() as generic for
>> x86 and arm64. Since reserve_crashkernel[_low]() implementations
>> are quite similar on other architectures as well, we can have more
>> users of this later.
>>
>> So have CONFIG_ARCH_WANT_RESERVE_CRASH_KERNEL in arch/Kconfig and
>> select this by X86 and ARM64.
> This looks much better with the help of
> CONFIG_ARCH_WANT_RESERVE_CRASH_KERNEL. And please take off the
> 'Suggested-by' tag from me, I just don't like the old CONFIG_X86 and
> CONFIG_ARM64 ifdeffery way in v13, Mike suggested this ARCH_WANT_
> option.
OK, i will delete this.
>
> And the two dummy function reserve_crashkernel() in x86 and arm64 looks
> not so good, but I don't have better idea. Maybe add
> CONFIG_ARCH_WANT_RESERVE_CRASH_KERNEL iddeffery in the call site of
> reserve_crashkernel() in each ARCH? Or just leave with it for now if no
> other people has concern or suggestion about it.
>
> Anyway, ack this one.
>
> Acked-by: Baoquan He <bhe@...hat.com>
>
> Thanks
> Baoquan
>
>
>> Suggested-by: Mike Rapoport <rppt@...nel.org>
>> Suggested-by: Baoquan He <bhe@...hat.com>
>> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
>> ---
>>  arch/Kconfig        | 3 +++
>>  arch/arm64/Kconfig  | 1 +
>>  arch/x86/Kconfig    | 2 ++
>>  kernel/crash_core.c | 7 ++-----
>>  4 files changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/Kconfig b/arch/Kconfig
>> index 24862d15f3a3..0ca1ff5bb157 100644
>> --- a/arch/Kconfig
>> +++ b/arch/Kconfig
>> @@ -24,6 +24,9 @@ config KEXEC_ELF
>>  config HAVE_IMA_KEXEC
>>  	bool
>>  
>> +config ARCH_WANT_RESERVE_CRASH_KERNEL
>> +	bool
>> +
>>  config SET_FS
>>  	bool
>>  
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index f39568b28ec1..09365c7ff469 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -82,6 +82,7 @@ config ARM64
>>  	select ARCH_WANT_FRAME_POINTERS
>>  	select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
>>  	select ARCH_WANT_LD_ORPHAN_WARN
>> +	select ARCH_WANT_RESERVE_CRASH_KERNEL if KEXEC_CORE
>>  	select ARCH_HAS_UBSAN_SANITIZE_ALL
>>  	select ARM_AMBA
>>  	select ARM_ARCH_TIMER
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 21f851179ff0..e6926fcb4a40 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -12,6 +12,7 @@ config X86_32
>>  	depends on !64BIT
>>  	# Options that are inherently 32-bit kernel only:
>>  	select ARCH_WANT_IPC_PARSE_VERSION
>> +	select ARCH_WANT_RESERVE_CRASH_KERNEL if KEXEC_CORE
>>  	select CLKSRC_I8253
>>  	select CLONE_BACKWARDS
>>  	select GENERIC_VDSO_32
>> @@ -28,6 +29,7 @@ config X86_64
>>  	select ARCH_HAS_GIGANTIC_PAGE
>>  	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
>>  	select ARCH_USE_CMPXCHG_LOCKREF
>> +	select ARCH_WANT_RESERVE_CRASH_KERNEL if KEXEC_CORE
>>  	select HAVE_ARCH_SOFT_DIRTY
>>  	select MODULES_USE_ELF_RELA
>>  	select NEED_DMA_MAP_STATE
>> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
>> index 8479be270c0b..2c5783985db5 100644
>> --- a/kernel/crash_core.c
>> +++ b/kernel/crash_core.c
>> @@ -320,9 +320,7 @@ int __init parse_crashkernel_low(char *cmdline,
>>   * --------- Crashkernel reservation ------------------------------
>>   */
>>  
>> -#ifdef CONFIG_KEXEC_CORE
>> -
>> -#if defined(CONFIG_X86) || defined(CONFIG_ARM64)
>> +#ifdef CONFIG_ARCH_WANT_RESERVE_CRASH_KERNEL
>>  static int __init reserve_crashkernel_low(void)
>>  {
>>  #ifdef CONFIG_64BIT
>> @@ -450,8 +448,7 @@ void __init reserve_crashkernel(void)
>>  	crashk_res.start = crash_base;
>>  	crashk_res.end   = crash_base + crash_size - 1;
>>  }
>> -#endif
>> -#endif /* CONFIG_KEXEC_CORE */
>> +#endif /* CONFIG_ARCH_WANT_RESERVE_CRASH_KERNEL */
>>  
>>  Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
>>  			  void *data, size_t data_len)
>> -- 
>> 2.20.1
>>
> .
>