linux-kernel - [PATCH v6 03/14] arm/kexec: refactor for kernel/Kconfig.kexec

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Date:   Wed, 12 Jul 2023 12:15:34 -0400
From:   Eric DeVolder <eric.devolder@...cle.com>
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Subject: [PATCH v6 03/14] arm/kexec: refactor for kernel/Kconfig.kexec

The kexec and crash kernel options are provided in the common
kernel/Kconfig.kexec. Utilize the common options and provide
the ARCH_SUPPORTS_ and ARCH_SELECTS_ entries to recreate the
equivalent set of KEXEC and CRASH options.

Signed-off-by: Eric DeVolder <eric.devolder@...cle.com>
---
 arch/arm/Kconfig | 29 ++++-------------------------
 1 file changed, 4 insertions(+), 25 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 7a27550ff3c1..1a6a6eb48a15 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1645,20 +1645,8 @@ config XIP_DEFLATED_DATA
 	  copied, saving some precious ROM space. A possible drawback is a
 	  slightly longer boot delay.
 
-config KEXEC
-	bool "Kexec system call (EXPERIMENTAL)"
-	depends on (!SMP || PM_SLEEP_SMP)
-	depends on MMU
-	select KEXEC_CORE
-	help
-	  kexec is a system call that implements the ability to shutdown your
-	  current kernel, and to start another kernel.  It is like a reboot
-	  but it is independent of the system firmware.   And like a reboot
-	  you can start any kernel with it, not just Linux.
-
-	  It is an ongoing process to be certain the hardware in a machine
-	  is properly shutdown, so do not be surprised if this code does not
-	  initially work for you.
+config ARCH_SUPPORTS_KEXEC
+	def_bool (!SMP || PM_SLEEP_SMP) && MMU
 
 config ATAGS_PROC
 	bool "Export atags in procfs"
@@ -1668,17 +1656,8 @@ config ATAGS_PROC
 	  Should the atags used to boot the kernel be exported in an "atags"
 	  file in procfs. Useful with kexec.
 
-config CRASH_DUMP
-	bool "Build kdump crash kernel (EXPERIMENTAL)"
-	help
-	  Generate crash dump after being started by kexec. This should
-	  be normally only set in special crash dump kernels which are
-	  loaded in the main kernel with kexec-tools into a specially
-	  reserved region and then later executed after a crash by
-	  kdump/kexec. The crash dump kernel must be compiled to a
-	  memory address not used by the main kernel
-
-	  For more details see Documentation/admin-guide/kdump/kdump.rst
+config ARCH_SUPPORTS_CRASH_DUMP
+	def_bool y
 
 config AUTO_ZRELADDR
 	bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM
-- 
2.31.1