+ arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: arm64, crash: wrap crash dumping code into crash related ifdefs
has been added to the -mm mm-unstable branch.  Its filename is
     arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Baoquan He <bhe@redhat.com>
Subject: arm64, crash: wrap crash dumping code into crash related ifdefs
Date: Wed, 24 Jan 2024 13:12:47 +0800

Now crash codes under kernel/ folder has been split out from kexec
code, crash dumping can be separated from kexec reboot in config
items on arm64 with some adjustments.

Here wrap up crash dumping codes with CONFIG_CRASH_DUMP ifdeffery.

Link: https://lkml.kernel.org/r/20240124051254.67105-8-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/include/asm/kexec.h         |    2 +-
 arch/arm64/kernel/machine_kexec.c      |    2 +-
 arch/arm64/kernel/machine_kexec_file.c |   10 ++++++++--
 arch/arm64/mm/init.c                   |    2 +-
 4 files changed, 11 insertions(+), 5 deletions(-)

--- a/arch/arm64/include/asm/kexec.h~arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs
+++ a/arch/arm64/include/asm/kexec.h
@@ -80,7 +80,7 @@ static inline void crash_setup_regs(stru
 	}
 }
 
-#if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
+#if defined(CONFIG_CRASH_DUMP) && defined(CONFIG_HIBERNATION)
 extern bool crash_is_nosave(unsigned long pfn);
 extern void crash_prepare_suspend(void);
 extern void crash_post_resume(void);
--- a/arch/arm64/kernel/machine_kexec.c~arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs
+++ a/arch/arm64/kernel/machine_kexec.c
@@ -255,7 +255,7 @@ void machine_crash_shutdown(struct pt_re
 	pr_info("Starting crashdump kernel...\n");
 }
 
-#ifdef CONFIG_HIBERNATION
+#if defined(CONFIG_CRASH_DUMP) && defined(CONFIG_HIBERNATION)
 /*
  * To preserve the crash dump kernel image, the relevant memory segments
  * should be mapped again around the hibernation.
--- a/arch/arm64/kernel/machine_kexec_file.c~arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs
+++ a/arch/arm64/kernel/machine_kexec_file.c
@@ -39,6 +39,7 @@ int arch_kimage_file_post_load_cleanup(s
 	return kexec_image_post_load_cleanup_default(image);
 }
 
+#ifdef CONFIG_CRASH_DUMP
 static int prepare_elf_headers(void **addr, unsigned long *sz)
 {
 	struct crash_mem *cmem;
@@ -80,6 +81,7 @@ out:
 	kfree(cmem);
 	return ret;
 }
+#endif
 
 /*
  * Tries to add the initrd and DTB to the image. If it is not possible to find
@@ -93,8 +95,8 @@ int load_other_segments(struct kimage *i
 			char *cmdline)
 {
 	struct kexec_buf kbuf;
-	void *headers, *dtb = NULL;
-	unsigned long headers_sz, initrd_load_addr = 0, dtb_len,
+	void *dtb = NULL;
+	unsigned long initrd_load_addr = 0, dtb_len,
 		      orig_segments = image->nr_segments;
 	int ret = 0;
 
@@ -102,7 +104,10 @@ int load_other_segments(struct kimage *i
 	/* not allocate anything below the kernel */
 	kbuf.buf_min = kernel_load_addr + kernel_size;
 
+#ifdef CONFIG_CRASH_DUMP
 	/* load elf core header */
+	void *headers;
+	unsigned long headers_sz;
 	if (image->type == KEXEC_TYPE_CRASH) {
 		ret = prepare_elf_headers(&headers, &headers_sz);
 		if (ret) {
@@ -130,6 +135,7 @@ int load_other_segments(struct kimage *i
 		kexec_dprintk("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
 			      image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
 	}
+#endif
 
 	/* load initrd */
 	if (initrd) {
--- a/arch/arm64/mm/init.c~arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs
+++ a/arch/arm64/mm/init.c
@@ -100,7 +100,7 @@ static void __init arch_reserve_crashker
 	bool high = false;
 	int ret;
 
-	if (!IS_ENABLED(CONFIG_KEXEC_CORE))
+	if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
 		return;
 
 	ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
_

Patches currently in -mm which might be from bhe@redhat.com are

mm-vmalloc-remove-vmap_area_list.patch
kexec-split-crashkernel-reservation-code-out-from-crash_corec.patch
crash-split-vmcoreinfo-exporting-code-out-from-crash_corec.patch
crash-remove-dependency-of-fa_dump-on-crash_dump.patch
crash-split-crash-dumping-code-out-from-kexec_corec.patch
crash-clean-up-kdump-related-config-items.patch
x86-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
arm64-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
ppc-crash-enforce-kexec-and-kexec_file-to-select-crash_dump.patch
s390-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
sh-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
mips-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
riscv-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
arm-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
loongarch-crash-wrap-crash-dumping-code-into-crash-related-ifdefs.patch
panic-suppress-gnu_printf-warning.patch