Re: [PATCH linux-next v3 05/14] crash: clean up kdump related config items

Dave Vasilevsky
2024-08-23T00:41:47Z

On 2024-08-22 20:04, Baoquan He wrote:
> If so, below patch possiblly can fix it. Can you help check if it's OK?

That removes the possibility of enabling CRASH_DUMP on PPC_BOOK3S_32, even when booting via other mechanisms. Maybe it would be best to just make it not-default? Please take a look at this patch:

From d6e5fe3a45f46f1aa01914648c443291d956de9e Mon Sep 17 00:00:00 2001
From: Dave Vasilevsky <dave@vasilevsky.ca>
Date: Thu, 22 Aug 2024 20:13:46 -0400
Subject: [PATCH] powerpc: Default to CRASH_DUMP=n when Open Firmware boot is
likely
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Open Firmware is unable to boot a kernel where PHYSICAL_START is
non-zero, which occurs when CRASH_DUMP is on.

On PPC_BOOK3S_32, the most common way of booting is Open Firmware, so
most users probably don't want CRASH_DUMP. Users booting via some
other mechanism can turn it on explicitly.

Signed-off-by: Dave Vasilevsky <dave@vasilevsky.ca>
Reported-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Fixes: 75bc255a7444
---
arch/arm/Kconfig | 3 +++
arch/arm64/Kconfig | 3 +++
arch/loongarch/Kconfig | 3 +++
arch/mips/Kconfig | 3 +++
arch/powerpc/Kconfig | 4 ++++
arch/riscv/Kconfig | 3 +++
arch/s390/Kconfig | 3 +++
arch/sh/Kconfig | 3 +++
arch/x86/Kconfig | 3 +++
kernel/Kconfig.kexec | 2 +-
10 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 54b2bb817a7f..200995052690 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1597,6 +1597,9 @@ config ATAGS_PROC
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
config AUTO_ZRELADDR
bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM
default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a2f8ff354ca6..43e08cc8204f 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1558,6 +1558,9 @@ config ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_SIG
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
def_bool CRASH_RESERVE

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 70f169210b52..ce232ddcd27d 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -599,6 +599,9 @@ config ARCH_SUPPORTS_KEXEC
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
config ARCH_SELECTS_CRASH_DUMP
def_bool y
depends on CRASH_DUMP
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 60077e576935..b547f4304d0c 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2881,6 +2881,9 @@ config ARCH_SUPPORTS_KEXEC
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
config PHYSICAL_START
hex "Physical address where the kernel is loaded"
default "0xffffffff84000000"
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index d7b09b064a8a..0f3c1f958eac 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -682,6 +682,10 @@ config RELOCATABLE_TEST
config ARCH_SUPPORTS_CRASH_DUMP
def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)

+config ARCH_DEFAULT_CRASH_DUMP
+ bool
+ default y if !PPC_BOOK3S_32
+
config ARCH_SELECTS_CRASH_DUMP
def_bool y
depends on CRASH_DUMP
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 0f3cd7c3a436..eb247b5ee569 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -880,6 +880,9 @@ config ARCH_SUPPORTS_KEXEC_PURGATORY
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
def_bool CRASH_RESERVE

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index a822f952f64a..05a1fb408471 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -275,6 +275,9 @@ config ARCH_SUPPORTS_CRASH_DUMP
This option also enables s390 zfcpdump.
See also <file:Documentation/arch/s390/zfcpdump.rst>

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
menu "Processor type and features"

config HAVE_MARCH_Z10_FEATURES
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 1aa3c4a0c5b2..3a6338962636 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -549,6 +549,9 @@ config ARCH_SUPPORTS_KEXEC
config ARCH_SUPPORTS_CRASH_DUMP
def_bool BROKEN_ON_SMP

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
config ARCH_SUPPORTS_KEXEC_JUMP
def_bool y

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 007bab9f2a0e..aa4666bb9e9c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2087,6 +2087,9 @@ config ARCH_SUPPORTS_KEXEC_JUMP
config ARCH_SUPPORTS_CRASH_DUMP
def_bool X86_64 || (X86_32 && HIGHMEM)

+config ARCH_DEFAULT_CRASH_DUMP
+ def_bool y
+
config ARCH_SUPPORTS_CRASH_HOTPLUG
def_bool y

diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 6c34e63c88ff..4d111f871951 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -97,7 +97,7 @@ config KEXEC_JUMP

config CRASH_DUMP
bool "kernel crash dumps"
- default y
+ default ARCH_DEFAULT_CRASH_DUMP
depends on ARCH_SUPPORTS_CRASH_DUMP
depends on KEXEC_CORE
select VMCORE_INFO
--
2.34.1