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@xxxxxxxxxx>
>
> Thanks
> Baoquan
>
>
>> Suggested-by: Mike Rapoport <rppt@xxxxxxxxxx>
>> Suggested-by: Baoquan He <bhe@xxxxxxxxxx>
>> Signed-off-by: Chen Zhou <chenzhou10@xxxxxxxxxx>
>> ---
>> 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
>>
> .
>
