linux-kernel - [PATCH v2 06/12] fs/proc/vmcore: factor out allocating a vmcore range and adding it to a list

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Message-ID: <20241204125444.1734652-7-david@redhat.com>
Date: Wed,  4 Dec 2024 13:54:37 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	linux-s390@...r.kernel.org,
	virtualization@...ts.linux.dev,
	kvm@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	kexec@...ts.infradead.org,
	David Hildenbrand <david@...hat.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Baoquan He <bhe@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Dave Young <dyoung@...hat.com>,
	Thomas Huth <thuth@...hat.com>,
	Cornelia Huck <cohuck@...hat.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	Eric Farman <farman@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2 06/12] fs/proc/vmcore: factor out allocating a vmcore range and adding it to a list

Let's factor it out into include/linux/crash_dump.h, from where we can
use it also outside of vmcore.c later.

Acked-by: Baoquan He <bhe@...hat.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 fs/proc/vmcore.c           | 21 ++-------------------
 include/linux/crash_dump.h | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 8d262017ca11..9b72e255dd03 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -709,11 +709,6 @@ static const struct proc_ops vmcore_proc_ops = {
 	.proc_mmap	= mmap_vmcore,
 };
 
-static struct vmcore_range * __init get_new_element(void)
-{
-	return kzalloc(sizeof(struct vmcore_range), GFP_KERNEL);
-}
-
 static u64 get_vmcore_size(size_t elfsz, size_t elfnotesegsz,
 			   struct list_head *vc_list)
 {
@@ -1116,7 +1111,6 @@ static int __init process_ptload_program_headers_elf64(char *elfptr,
 						size_t elfnotes_sz,
 						struct list_head *vc_list)
 {
-	struct vmcore_range *new;
 	int i;
 	Elf64_Ehdr *ehdr_ptr;
 	Elf64_Phdr *phdr_ptr;
@@ -1139,13 +1133,8 @@ static int __init process_ptload_program_headers_elf64(char *elfptr,
 		end = roundup(paddr + phdr_ptr->p_memsz, PAGE_SIZE);
 		size = end - start;
 
-		/* Add this contiguous chunk of memory to vmcore list.*/
-		new = get_new_element();
-		if (!new)
+		if (vmcore_alloc_add_range(vc_list, start, size))
 			return -ENOMEM;
-		new->paddr = start;
-		new->size = size;
-		list_add_tail(&new->list, vc_list);
 
 		/* Update the program header offset. */
 		phdr_ptr->p_offset = vmcore_off + (paddr - start);
@@ -1159,7 +1148,6 @@ static int __init process_ptload_program_headers_elf32(char *elfptr,
 						size_t elfnotes_sz,
 						struct list_head *vc_list)
 {
-	struct vmcore_range *new;
 	int i;
 	Elf32_Ehdr *ehdr_ptr;
 	Elf32_Phdr *phdr_ptr;
@@ -1182,13 +1170,8 @@ static int __init process_ptload_program_headers_elf32(char *elfptr,
 		end = roundup(paddr + phdr_ptr->p_memsz, PAGE_SIZE);
 		size = end - start;
 
-		/* Add this contiguous chunk of memory to vmcore list.*/
-		new = get_new_element();
-		if (!new)
+		if (vmcore_alloc_add_range(vc_list, start, size))
 			return -ENOMEM;
-		new->paddr = start;
-		new->size = size;
-		list_add_tail(&new->list, vc_list);
 
 		/* Update the program header offset */
 		phdr_ptr->p_offset = vmcore_off + (paddr - start);
diff --git a/include/linux/crash_dump.h b/include/linux/crash_dump.h
index 788a45061f35..9717912ce4d1 100644
--- a/include/linux/crash_dump.h
+++ b/include/linux/crash_dump.h
@@ -121,6 +121,20 @@ struct vmcore_range {
 	loff_t offset;
 };
 
+/* Allocate a vmcore range and add it to the list. */
+static inline int vmcore_alloc_add_range(struct list_head *list,
+		unsigned long long paddr, unsigned long long size)
+{
+	struct vmcore_range *m = kzalloc(sizeof(*m), GFP_KERNEL);
+
+	if (!m)
+		return -ENOMEM;
+	m->paddr = paddr;
+	m->size = size;
+	list_add_tail(&m->list, list);
+	return 0;
+}
+
 #else /* !CONFIG_CRASH_DUMP */
 static inline bool is_kdump_kernel(void) { return false; }
 #endif /* CONFIG_CRASH_DUMP */
-- 
2.47.1