[patch 098/166] proc: use ppos instead of m->version

Andrew Morton
2020-04-07T03:09:17Z

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: proc: use ppos instead of m->version

The ppos is a private cursor, just like m->version. Use the canonical
cursor, not a special one.

Link: http://lkml.kernel.org/r/20200317193201.9924-3-adobriyan@gmail.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

fs/proc/task_mmu.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/proc/task_mmu.c~proc-use-ppos-instead-of-m-version
+++ a/fs/proc/task_mmu.c
@@ -134,7 +134,7 @@ m_next_vma(struct proc_maps_private *pri
static void *m_start(struct seq_file *m, loff_t *ppos)
{
struct proc_maps_private *priv = m->private;
- unsigned long last_addr = m->version;
+ unsigned long last_addr = *ppos;
struct mm_struct *mm;
struct vm_area_struct *vma;

@@ -170,14 +170,13 @@ static void *m_start(struct seq_file *m,
return priv->tail_vma;
}

-static void *m_next(struct seq_file *m, void *v, loff_t *pos)
+static void *m_next(struct seq_file *m, void *v, loff_t *ppos)
{
struct proc_maps_private *priv = m->private;
struct vm_area_struct *next;

- (*pos)++;
next = m_next_vma(priv, v);
- m->version = next ? next->vm_start : -1UL;
+ *ppos = next ? next->vm_start : -1UL;

return next;
}
_