linux-kernel - [PATCH linux-next v3 07/14] arm64, crash: wrap crash dumping code into crash related ifdefs

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Date: Wed, 24 Jan 2024 13:12:47 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: kexec@...ts.infradead.org,
	x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org,
	linux-sh@...r.kernel.org,
	linux-mips@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	loongarch@...ts.linux.dev,
	akpm@...ux-foundation.org,
	ebiederm@...ssion.com,
	hbathini@...ux.ibm.com,
	piliu@...hat.com,
	viro@...iv.linux.org.uk,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH linux-next v3 07/14] arm64, crash: wrap crash dumping code into crash related ifdefs

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.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 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(-)

diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
index 9ac9572a3bbe..4d9cc7a76d9c 100644
--- a/arch/arm64/include/asm/kexec.h
+++ b/arch/arm64/include/asm/kexec.h
@@ -80,7 +80,7 @@ static inline void crash_setup_regs(struct pt_regs *newregs,
 	}
 }
 
-#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);
diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
index b38aae5b488d..82e2203d86a3 100644
--- a/arch/arm64/kernel/machine_kexec.c
+++ b/arch/arm64/kernel/machine_kexec.c
@@ -255,7 +255,7 @@ void machine_crash_shutdown(struct pt_regs *regs)
 	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.
diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 0e017358f4ba..af1ca875c52c 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -39,6 +39,7 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	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 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)
 	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 *image,
 			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 *image,
 	/* 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 *image,
 		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) {
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 74c1db8ce271..c1f6213e77f3 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -100,7 +100,7 @@ static void __init arch_reserve_crashkernel(void)
 	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(),
-- 
2.41.0