EljakimHerrewijnen/Openwrt
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x86: make crashdump works

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1. KERNEL_CRASH_DUMP should depends on KERNEL_PROC_KCORE (kexec use it)
2. select crashkernel mem size by totalmem
   mem <= 256M disable crashkernel by default
   mem >= 4G use 256M for crashkernel
   mem >= 8G use 512M for crashkernel
   default use 128M
3. set BOOT_IMAGE in kdump.init
4. resolve a "Unhandled rela relocation: R_X86_64_PLT32" error

Tested on x86_64

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>
This commit is contained in:
Chen Minqiang 2019-07-11 22:34:03 +08:00 committed by Daniel Golle
parent ecef29b294
commit ec5e8461c1
4 changed files with 33 additions and 1 deletions
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4
config/Config-kernel.in
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@ -477,10 +477,14 @@ config KERNEL_KEXEC
config KERNEL_PROC_VMCORE
bool
config KERNEL_PROC_KCORE
bool
config KERNEL_CRASH_DUMP
depends on i386 || x86_64 || arm || armeb
select KERNEL_KEXEC
select KERNEL_PROC_VMCORE
select KERNEL_PROC_KCORE
bool "Enable support for kexec crashdump"
default y

14
package/boot/kexec-tools/files/kdump.defaults
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@ -1,10 +1,22 @@
#!/bin/sh
# kB disable if mem low than 256MB
memtotal=`grep MemTotal /proc/meminfo | awk '{print $2}'`
if test $memtotal -le 262144; then
exit 0
fi
KZ=128
if test $memtotal -ge 8388608; then
KZ=512
elif test $memtotal -ge 4194304; then
KZ=256
fi
case $(uname -m) in
i?86|x86_64)
if ! grep -q crashkernel /boot/grub/grub.cfg; then
mount /boot -o remount,rw
sed -i 's/linux.*/& crashkernel=32M@32M/' /boot/grub/grub.cfg
sed -i "s/linux.*/& crashkernel=${KZ}M/" /boot/grub/grub.cfg
mount /boot -o remount,ro
fi
;;

2
package/boot/kexec-tools/files/kdump.init
View File

@ -3,6 +3,8 @@
START=41
STOP=90
BOOT_IMAGE=/boot/vmlinuz
EXTRA_COMMANDS="status"
EXTRA_HELP=" status Print crashkernel status"

14
package/boot/kexec-tools/patches/100-kexec-tools-fix-for-Unhandled-rela-relocation-R_X86_64_PLT32-error.patch Normal file
View File

@ -0,0 +1,14 @@
diff --git a/kexec/arch/x86_64/kexec-elf-rel-x86_64.c b/kexec/arch/x86_64/kexec-elf-rel-x86_64.c
index 7fdde73..af33689 100644
--- a/kexec/arch/x86_64/kexec-elf-rel-x86_64.c
+++ b/kexec/arch/x86_64/kexec-elf-rel-x86_64.c
@@ -78,7 +78,8 @@ void machine_apply_elf_rel(struct mem_ehdr *UNUSED(ehdr),
if ((int64_t)value != *(int32_t *)location)
goto overflow;
break;
- case R_X86_64_PC32:
+ case R_X86_64_PC32:
+ case R_X86_64_PLT32:
*(uint32_t *)location = value - address;
break;
default: