[PATCH] kexec: change CONFIG_PHYSICAL_START dependency

[mirror_ubuntu-jammy-kernel.git] / arch / x86_64 / Kconfig

diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index dd2d116b9ab87985e2927e6cc598a4d7a09226b5..348b4a0d0d6f69c459240d6fc4d75c152440b132 100644 (file)
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -399,17 +399,6 @@ config X86_MCE_AMD
           Additional support for AMD specific MCE features such as
           the DRAM Error Threshold.
 
-config PHYSICAL_START
-       hex "Physical address where the kernel is loaded" if EMBEDDED
-       default "0x100000"
-       help
-         This gives the physical address where the kernel is loaded.
-         Primarily used in the case of kexec on panic where the
-         fail safe kernel needs to run at a different address than
-         the panic-ed kernel.
-
-         Don't change this unless you know what you are doing.
-
 config KEXEC
        bool "kexec system call (EXPERIMENTAL)"
        depends on EXPERIMENTAL
@@ -429,11 +418,29 @@ config KEXEC
 
 config CRASH_DUMP
        bool "kernel crash dumps (EXPERIMENTAL)"
-       depends on EMBEDDED
        depends on EXPERIMENTAL
        help
                Generate crash dump after being started by kexec.
 
+config PHYSICAL_START
+       hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
+       default "0x1000000" if CRASH_DUMP
+       default "0x100000"
+       help
+         This gives the physical address where the kernel is loaded. Normally
+         for regular kernels this value is 0x100000 (1MB). But in the case
+         of kexec on panic the fail safe kernel needs to run at a different
+         address than the panic-ed kernel. This option is used to set the load
+         address for kernels used to capture crash dump on being kexec'ed
+         after panic. The default value for crash dump kernels is
+         0x1000000 (16MB). This can also be set based on the "X" value as
+         specified in the "crashkernel=YM@XM" command line boot parameter
+         passed to the panic-ed kernel. Typically this parameter is set as
+         crashkernel=64M@16M. Please take a look at
+         Documentation/kdump/kdump.txt for more details about crash dumps.
+
+         Don't change this unless you know what you are doing.
+
 config SECCOMP
        bool "Enable seccomp to safely compute untrusted bytecode"
        depends on PROC_FS