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Subject[RFC][PATCH 1/6] kcore: clean up to use generic list ops
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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

And read_kcore() use "m" to specifiy
- kcore entry
- vmalloc entry
in different types.
This patch renames "m" to "vms" for vmalloc(), avoiding confusion.

No changes in logic. just clean up.

Changelog v1->v3
- no changes.

Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
fs/proc/kcore.c | 41 ++++++++++++++++++++++-------------------
include/linux/proc_fs.h | 2 +-
2 files changed, 23 insertions(+), 20 deletions(-)
Index: mmotm-2.6.31-Jul16/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Jul16.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Jul16/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
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,
*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 *bu
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 __use
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;
}
@@ -328,7 +328,7 @@ read_kcore(struct file *file, char __use
return -EFAULT;
} else if (is_vmalloc_addr((void *)start)) {
char * elf_buf;
- struct vm_struct *m;
+ struct vm_struct *vms;
unsigned long curstart = start;
unsigned long cursize = tsz;

@@ -337,29 +337,32 @@ read_kcore(struct file *file, char __use
return -ENOMEM;

read_lock(&vmlist_lock);
- for (m=vmlist; m && cursize; m=m->next) {
+ for (vms = vmlist; vms && cursize; vms = vms->next) {
unsigned long vmstart;
unsigned long vmsize;
- unsigned long msize = m->size - PAGE_SIZE;
+ unsigned long msize = vms->size - PAGE_SIZE;
+ unsigned long curend, vmend;

- if (((unsigned long)m->addr + msize) <
+ if (((unsigned long)vms->addr + msize) <
curstart)
continue;
- if ((unsigned long)m->addr > (curstart +
+ if ((unsigned long)vms->addr > (curstart +
cursize))
break;
- vmstart = (curstart < (unsigned long)m->addr ?
- (unsigned long)m->addr : curstart);
- if (((unsigned long)m->addr + msize) >
- (curstart + cursize))
- vmsize = curstart + cursize - vmstart;
+ if (curstart < (unsigned long)vms->addr)
+ vmstart = (unsigned long)vms->addr;
else
- vmsize = (unsigned long)m->addr +
- msize - vmstart;
+ vmstart = curstart;
+ curend = curstart + cursize;
+ vmend = (unsigned long)vms->addr + msize;
+ if (vmend > curend)
+ vmsize = curend - vmstart;
+ else
+ vmsize = vmend - vmstart;
curstart = vmstart + vmsize;
cursize -= vmsize;
/* don't dump ioremap'd stuff! (TA) */
- if (m->flags & VM_IOREMAP)
+ if (vms->flags & VM_IOREMAP)
continue;
memcpy(elf_buf + (vmstart - start),
(char *)vmstart, vmsize);
Index: mmotm-2.6.31-Jul16/include/linux/proc_fs.h
===================================================================
--- mmotm-2.6.31-Jul16.orig/include/linux/proc_fs.h
+++ mmotm-2.6.31-Jul16/include/linux/proc_fs.h
@@ -79,7 +79,7 @@ struct proc_dir_entry {
};

struct kcore_list {
- struct kcore_list *next;
+ struct list_head list;
unsigned long addr;
size_t size;
};


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