kcore: use usual list for kclist

This patchset is for /proc/kcore.  With this,

 - many per-arch hooks are removed.

 - /proc/kcore will know really valid physical memory area.

 - /proc/kcore will be aware of memory hotplug.

 - /proc/kcore will be architecture independent i.e.
   if an arch supports CONFIG_MMU, it can use /proc/kcore.
   (if the arch uses usual memory layout.)

This patch:

/proc/kcore uses its own list handling codes. It's better to use
generic list codes.

No changes in logic. just clean up.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 0cf8a24cf6c3..f9327e51ce99 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
+#include <linux/list.h>
 
 #define CORE_STR "CORE"
 
@@ -57,7 +58,7 @@ struct memelfnote
         void *data;
 };
 
-static struct kcore_list *kclist;
+static LIST_HEAD(kclist_head);
 static DEFINE_RWLOCK(kclist_lock);
 
 void
@@ -67,8 +68,7 @@ kclist_add(struct kcore_list *new, void *addr, size_t size)
         new->size = size;
 
         write_lock(&kclist_lock);
-        new->next = kclist;
-        kclist = new;
+        list_add_tail(&new->list, &kclist_head);
         write_unlock(&kclist_lock);
 }
 
@@ -80,7 +80,7 @@ static size_t get_kcore_size(int *nphdr, size_t *elf_buflen)
         *nphdr = 1; /* PT_NOTE */
         size = 0;
 
-        for (m=kclist; m; m=m->next) {
+        list_for_each_entry(m, &kclist_head, list) {
                 try = kc_vaddr_to_offset((size_t)m->addr + m->size);
                 if (try > size)
                         size = try;
@@ -192,7 +192,7 @@ static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff)
         nhdr->p_align   = 0;
 
         /* setup ELF PT_LOAD program header for every area */
-        for (m=kclist; m; m=m->next) {
+        list_for_each_entry(m, &kclist_head, list) {
                 phdr = (struct elf_phdr *) bufp;
                 bufp += sizeof(struct elf_phdr);
                 offset += sizeof(struct elf_phdr);
@@ -317,7 +317,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
                 struct kcore_list *m;
 
                 read_lock(&kclist_lock);
-                for (m=kclist; m; m=m->next) {
+                list_for_each_entry(m, &kclist_head, list) {
                         if (start >= m->addr && start < (m->addr+m->size))
                                 break;
                 }