The patch titled
Subject: crash_core: move crashk_*res definition into crash_core.c
has been added to the -mm mm-nonmm-unstable branch. Its filename is
crash_core-move-crashk_res-definition-into-crash_corec.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/crash_core-move-crashk_res-definition-into-crash_corec.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: crash_core: move crashk_*res definition into crash_core.c
Date: Thu, 14 Sep 2023 11:31:38 +0800
Both crashk_res and crashk_low_res are used to mark the reserved
crashkernel regions in iomem_resource tree. And later the generic
crashkernel resrvation will be added into crash_core.c. So move
crashk_res and crashk_low_res definition into crash_core.c to avoid
compiling error if CONFIG_CRASH_CORE=on while CONFIG_KEXEC_CORE is unset.
Meanwhile include <asm/crash_core.h> in <linux/crash_core.h> if generic
reservation is needed. In that case, <asm/crash_core.h> need be added by
ARCH. In asm/crash_core.h, ARCH can provide its own macro definitions to
override macros in <linux/crash_core.h> if needed. Wrap the including
into CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION ifdeffery scope to
avoid compiling error in other ARCH-es which don't take the generic
reservation way yet.
Link: https://lkml.kernel.org/r/20230914033142.676708-6-bhe@xxxxxxxxxx
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Chen Jiahao <chenjiahao16@xxxxxxxxxx>
Cc: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/crash_core.h | 8 ++++++++
include/linux/kexec.h | 4 ----
kernel/crash_core.c | 16 ++++++++++++++++
kernel/kexec_core.c | 17 -----------------
4 files changed, 24 insertions(+), 21 deletions(-)
--- a/include/linux/crash_core.h~crash_core-move-crashk_res-definition-into-crash_corec
+++ a/include/linux/crash_core.h
@@ -5,6 +5,14 @@
#include <linux/linkage.h>
#include <linux/elfcore.h>
#include <linux/elf.h>
+#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+#include <asm/crash_core.h>
+#endif
+
+/* Location of a reserved region to hold the crash kernel.
+ */
+extern struct resource crashk_res;
+extern struct resource crashk_low_res;
#define CRASH_CORE_NOTE_NAME "CORE"
#define CRASH_CORE_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
--- a/include/linux/kexec.h~crash_core-move-crashk_res-definition-into-crash_corec
+++ a/include/linux/kexec.h
@@ -22,10 +22,6 @@
#include <uapi/linux/kexec.h>
#include <linux/verification.h>
-/* Location of a reserved region to hold the crash kernel.
- */
-extern struct resource crashk_res;
-extern struct resource crashk_low_res;
extern note_buf_t __percpu *crash_notes;
#ifdef CONFIG_KEXEC_CORE
--- a/kernel/crash_core.c~crash_core-move-crashk_res-definition-into-crash_corec
+++ a/kernel/crash_core.c
@@ -35,6 +35,22 @@ u32 *vmcoreinfo_note;
/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
static unsigned char *vmcoreinfo_data_safecopy;
+/* Location of the reserved area for the crash kernel */
+struct resource crashk_res = {
+ .name = "Crash kernel",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
+ .desc = IORES_DESC_CRASH_KERNEL
+};
+struct resource crashk_low_res = {
+ .name = "Crash kernel",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
+ .desc = IORES_DESC_CRASH_KERNEL
+};
+
/*
* parsing the "crashkernel" commandline
*
--- a/kernel/kexec_core.c~crash_core-move-crashk_res-definition-into-crash_corec
+++ a/kernel/kexec_core.c
@@ -52,23 +52,6 @@ atomic_t __kexec_lock = ATOMIC_INIT(0);
/* Flag to indicate we are going to kexec a new kernel */
bool kexec_in_progress = false;
-
-/* Location of the reserved area for the crash kernel */
-struct resource crashk_res = {
- .name = "Crash kernel",
- .start = 0,
- .end = 0,
- .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
- .desc = IORES_DESC_CRASH_KERNEL
-};
-struct resource crashk_low_res = {
- .name = "Crash kernel",
- .start = 0,
- .end = 0,
- .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
- .desc = IORES_DESC_CRASH_KERNEL
-};
-
int kexec_should_crash(struct task_struct *p)
{
/*
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
crash_corec-remove-unnecessary-parameter-of-function.patch
crash_core-change-the-prototype-of-function-parse_crashkernel.patch
crash_core-change-parse_crashkernel-to-support-crashkernel=highlow-parsing.patch
crash_core-add-generic-function-to-do-reservation.patch
crash_core-move-crashk_res-definition-into-crash_corec.patch
x86-kdump-use-generic-interface-to-simplify-crashkernel-reservation-code.patch
arm64-kdump-use-generic-interface-to-simplify-crashkernel-reservation.patch
riscv-kdump-use-generic-interface-to-simplify-crashkernel-reservation.patch
crash_corec-remove-unneeded-functions.patch
