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Subject[PATCH v14 09/11] x86, arm64: Add ARCH_WANT_RESERVE_CRASH_KERNEL config
Date
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>
Suggested-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Chen Zhou <chenzhou10@huawei.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
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