[PATCH v19 06/13] kexec: move crashk[_low]_res to crash_core module

Zhen Lei
2021-12-28T13:29:36Z

From: Chen Zhou <chenzhou10@huawei.com>

Move the definition and declaration of global variable crashk[_low]_res
from kexec module to crash_core module, in preparation of adding generic
reserve_crashkernel_mem[_low]() to crash_core.c, the latter refers to
variable crashk[_low]_res. Due to the config KEXEC automatically selects
CRASH_CORE, and the header crash_core.h is included by kexec.h, so there
is no functional change.

Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
include/linux/crash_core.h | 4 ++++
include/linux/kexec.h | 4 ----
kernel/crash_core.c | 16 ++++++++++++++++
kernel/kexec_core.c | 17 -----------------
4 files changed, 20 insertions(+), 21 deletions(-)

diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index 598fd55d83c169e..f5437c9c9411fce 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -73,6 +73,10 @@ extern unsigned char *vmcoreinfo_data;
extern size_t vmcoreinfo_size;
extern u32 *vmcoreinfo_note;

+/* Location of a reserved region to hold the crash kernel. */
+extern struct resource crashk_res;
+extern struct resource crashk_low_res;
+
Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
void *data, size_t data_len);
void final_note(Elf_Word *buf);
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0c994ae37729e1e..47e784d66ea8645 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -350,10 +350,6 @@ extern int kexec_load_disabled;
#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
KEXEC_FILE_NO_INITRAMFS)

-/* 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;

/* flag to track if kexec reboot is in progress */
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index b7d024eb464d0ae..686d8a65e12a337 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -22,6 +22,22 @@ 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
*
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 5a5d192a89ac307..1e0d4909bbb6b77 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -54,23 +54,6 @@ note_buf_t __percpu *crash_notes;
/* 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)
{
/*
--
2.25.1