diff mbox series

[v16,08/11] x86, arm64: Add ARCH_WANT_RESERVE_CRASH_KERNEL config

Message ID 20211123124646.1995-9-thunder.leizhen@huawei.com (mailing list archive)
State New, archived
Headers show
Series support reserving crashkernel above 4G on arm64 kdump | expand

Commit Message

Leizhen (ThunderTown) Nov. 23, 2021, 12:46 p.m. UTC 
From: Chen Zhou <chenzhou10@huawei.com>

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.

Suggested-by: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Acked-by: Baoquan He <bhe@redhat.com>
---
 arch/Kconfig        | 3 +++
 arch/arm64/Kconfig  | 1 +
 arch/x86/Kconfig    | 2 ++
 kernel/crash_core.c | 7 ++-----
 4 files changed, 8 insertions(+), 5 deletions(-)

Comments

Catalin Marinas Dec. 8, 2021, 5:09 p.m. UTC | #1 
On Tue, Nov 23, 2021 at 08:46:43PM +0800, Zhen Lei wrote:
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 26b8ed11639da46..19256aa924c3b2c 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 c4207cf9bb17ffb..4b99efa36da3793 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -95,6 +95,7 @@ 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_WANTS_NO_INSTR
>  	select ARCH_HAS_UBSAN_SANITIZE_ALL
>  	select ARM_AMBA
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 7399327d1eff79d..528034b4276ecf8 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 4dc2643fcbccf99..b23cfc0ca8905fd 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -321,9 +321,7 @@ 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
> @@ -451,8 +449,7 @@ 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 */

Nitpick mostly but it may simplify the patches if the x86, arch/Kconfig
and crash_core.c changes here could be moved to patch 5. The remaining
select for arm64 should be moved to patch 7 and drop the #if change in
that patch.

This way we can keep the x86 patches on a separate branch.

Thanks.
Leizhen (ThunderTown) Dec. 9, 2021, 2:06 a.m. UTC | #2 
On 2021/12/9 1:09, Catalin Marinas wrote:
> On Tue, Nov 23, 2021 at 08:46:43PM +0800, Zhen Lei wrote:
>> diff --git a/arch/Kconfig b/arch/Kconfig
>> index 26b8ed11639da46..19256aa924c3b2c 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 c4207cf9bb17ffb..4b99efa36da3793 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -95,6 +95,7 @@ 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_WANTS_NO_INSTR
>>  	select ARCH_HAS_UBSAN_SANITIZE_ALL
>>  	select ARM_AMBA
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 7399327d1eff79d..528034b4276ecf8 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 4dc2643fcbccf99..b23cfc0ca8905fd 100644
>> --- a/kernel/crash_core.c
>> +++ b/kernel/crash_core.c
>> @@ -321,9 +321,7 @@ 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
>> @@ -451,8 +449,7 @@ 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 */
> 
> Nitpick mostly but it may simplify the patches if the x86, arch/Kconfig
> and crash_core.c changes here could be moved to patch 5. The remaining
> select for arm64 should be moved to patch 7 and drop the #if change in
> that patch.
> 
> This way we can keep the x86 patches on a separate branch.

That's a good suggestion. I will do it.

> 
> Thanks.
>
diff mbox series

Patch

diff --git a/arch/Kconfig b/arch/Kconfig
index 26b8ed11639da46..19256aa924c3b2c 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 c4207cf9bb17ffb..4b99efa36da3793 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -95,6 +95,7 @@  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_WANTS_NO_INSTR
 	select ARCH_HAS_UBSAN_SANITIZE_ALL
 	select ARM_AMBA
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7399327d1eff79d..528034b4276ecf8 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 4dc2643fcbccf99..b23cfc0ca8905fd 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -321,9 +321,7 @@  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
@@ -451,8 +449,7 @@  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 */
 
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