Re: [PATCH v5 11/13] riscv/kexec: refactor for kernel/Kconfig.kexec

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On 7/6/23 17:32, Palmer Dabbelt wrote:
On Thu, 06 Jul 2023 15:20:25 PDT (-0700), eric.devolder@xxxxxxxxxx wrote:
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@xxxxxxxxxx>
---
 arch/riscv/Kconfig | 44 +++++++++++++-------------------------------
 1 file changed, 13 insertions(+), 31 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index b49793cf34eb..8a3af850597a 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -647,48 +647,30 @@ config RISCV_BOOT_SPINWAIT

       If unsure what to do here, say N.

-config KEXEC
-    bool "Kexec system call"
-    depends on MMU
+config ARCH_SUPPORTS_KEXEC
+    def_bool MMU
+
+config ARCH_SELECTS_KEXEC
+    def_bool y
+    depends on KEXEC
     select HOTPLUG_CPU if SMP
-    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.

-      The name comes from the similarity to the exec system call.
+config ARCH_SUPPORTS_KEXEC_FILE
+    def_bool 64BIT && MMU

-config KEXEC_FILE
-    bool "kexec file based systmem call"
-    depends on 64BIT && MMU
+config ARCH_SELECTS_KEXEC_FILE
+    def_bool y
+    depends on KEXEC_FILE
     select HAVE_IMA_KEXEC if IMA
-    select KEXEC_CORE
     select KEXEC_ELF
-    help
-      This is new version of kexec system call. This system call is
-      file based and takes file descriptors as system call argument
-      for kernel and initramfs as opposed to list of segments as
-      accepted by previous system call.
-
-      If you don't know what to do here, say Y.

 config ARCH_HAS_KEXEC_PURGATORY
     def_bool KEXEC_FILE
     depends on CRYPTO=y
     depends on CRYPTO_SHA256=y

-config CRASH_DUMP
-    bool "Build kdump crash kernel"
-    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.
-
-      For more details see Documentation/admin-guide/kdump/kdump.rst
+config ARCH_SUPPORTS_CRASH_DUMP
+    def_bool y

 config COMPAT
     bool "Kernel support for 32-bit U-mode"

Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>

Thank you Palmer!
eric



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