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

[David Hildenbrand]

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 <b...@redhat.com>
Signed-off-by: David Hildenbrand <da...@redhat.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