The patch titled
Subject: crash_core: change parse_crashkernel() to support crashkernel=,high|low parsing
has been added to the -mm mm-nonmm-unstable branch. Its filename is
crash_core-change-parse_crashkernel-to-support-crashkernel=highlow-parsing.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/crash_core-change-parse_crashkernel-to-support-crashkernel=highlow-parsing.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: change parse_crashkernel() to support crashkernel=,high|low parsing
Date: Thu, 14 Sep 2023 11:31:36 +0800
Now parse_crashkernel() is a real entry point for all kinds of crahskernel
parsing on any architecture.
And wrap the crahskernel=,high|low handling inside
CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION ifdeffery scope.
Link: https://lkml.kernel.org/r/20230914033142.676708-4-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 | 6 +++++
kernel/crash_core.c | 36 ++++++++++++++++++++++++++++++++---
2 files changed, 39 insertions(+), 3 deletions(-)
--- a/include/linux/crash_core.h~crash_core-change-parse_crashkernel-to-support-crashkernel=highlow-parsing
+++ a/include/linux/crash_core.h
@@ -79,6 +79,12 @@ Elf_Word *append_elf_note(Elf_Word *buf,
void *data, size_t data_len);
void final_note(Elf_Word *buf);
+#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+#ifndef DEFAULT_CRASH_KERNEL_LOW_SIZE
+#define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20)
+#endif
+#endif
+
int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
unsigned long long *crash_size, unsigned long long *crash_base,
unsigned long long *low_size, bool *high);
--- a/kernel/crash_core.c~crash_core-change-parse_crashkernel-to-support-crashkernel=highlow-parsing
+++ a/kernel/crash_core.c
@@ -283,6 +283,9 @@ static int __init __parse_crashkernel(ch
/*
* That function is the entry point for command line parsing and should be
* called from the arch-specific code.
+ *
+ * If crashkernel=,high|low is supported on architecture, non-NULL values
+ * should be passed to parameters 'low_size' and 'high'.
*/
int __init parse_crashkernel(char *cmdline,
unsigned long long system_ram,
@@ -296,10 +299,37 @@ int __init parse_crashkernel(char *cmdli
/* crashkernel=X[@offset] */
ret = __parse_crashkernel(cmdline, system_ram, crash_size,
crash_base, NULL);
- if (!high)
- return ret;
+#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+ /*
+ * If non-NULL 'high' passed in and no normal crashkernel
+ * setting detected, try parsing crashkernel=,high|low.
+ */
+ if (high && ret == -ENOENT) {
+ ret = __parse_crashkernel(cmdline, 0, crash_size,
+ crash_base, suffix_tbl[SUFFIX_HIGH]);
+ if (ret || !*crash_size)
+ return -EINVAL;
- return 0;
+ /*
+ * crashkernel=Y,low can be specified or not, but invalid value
+ * is not allowed.
+ */
+ ret = __parse_crashkernel(cmdline, 0, low_size,
+ crash_base, suffix_tbl[SUFFIX_LOW]);
+ if (ret == -ENOENT) {
+ *low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+ ret = 0;
+ } else if (ret) {
+ return ret;
+ }
+
+ *high = true;
+ }
+#endif
+ if (!*crash_size)
+ ret = -EINVAL;
+
+ return ret;
}
int __init parse_crashkernel_high(char *cmdline,
_
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
