* [merged] fs-proc-task_mmuc-simplify-m_start-to-make-it-readable.patch removed from -mm tree
@ 2014-10-13 18:18 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2014-10-13 18:18 UTC (permalink / raw)
To: oleg, ebiederm, gorcunov, kirill.shutemov, mm-commits
The patch titled
Subject: fs/proc/task_mmu.c: simplify m_start() to make it readable
has been removed from the -mm tree. Its filename was
fs-proc-task_mmuc-simplify-m_start-to-make-it-readable.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Oleg Nesterov <oleg@redhat.com>
Subject: fs/proc/task_mmu.c: simplify m_start() to make it readable
Now that m->version is gone we can cleanup m_start(). In particular,
- Remove the "unsigned long" typecast, m->index can't be negative
or exceed ->map_count. But lets use "unsigned int pos" to make
it clear that "pos < map_count" is safe.
- Remove the unnecessary "vma != NULL" check in the main loop. It
can't be NULL unless we have a vm bug.
- This also means that "pos < map_count" case can simply return the
valid vma and avoid "goto" and subsequent checks.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/proc/task_mmu.c | 34 ++++++++++------------------------
1 file changed, 10 insertions(+), 24 deletions(-)
diff -puN fs/proc/task_mmu.c~fs-proc-task_mmuc-simplify-m_start-to-make-it-readable fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~fs-proc-task_mmuc-simplify-m_start-to-make-it-readable
+++ a/fs/proc/task_mmu.c
@@ -138,12 +138,12 @@ static void vma_stop(struct proc_maps_pr
mmput(mm);
}
-static void *m_start(struct seq_file *m, loff_t *pos)
+static void *m_start(struct seq_file *m, loff_t *ppos)
{
struct proc_maps_private *priv = m->private;
struct mm_struct *mm;
- struct vm_area_struct *vma, *tail_vma = NULL;
- loff_t l = *pos;
+ struct vm_area_struct *vma;
+ unsigned int pos = *ppos;
priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
if (!priv->task)
@@ -152,33 +152,19 @@ static void *m_start(struct seq_file *m,
mm = priv->mm;
if (!mm || !atomic_inc_not_zero(&mm->mm_users))
return NULL;
- down_read(&mm->mmap_sem);
- tail_vma = get_gate_vma(mm);
- priv->tail_vma = tail_vma;
+ down_read(&mm->mmap_sem);
hold_task_mempolicy(priv);
+ priv->tail_vma = get_gate_vma(mm);
- /*
- * Check the vma index is within the range and do
- * sequential scan until m_index.
- */
- vma = NULL;
- if ((unsigned long)l < mm->map_count) {
- vma = mm->mmap;
- while (l-- && vma)
+ if (pos < mm->map_count) {
+ for (vma = mm->mmap; pos; pos--)
vma = vma->vm_next;
- goto out;
- }
-
- if (l != mm->map_count)
- tail_vma = NULL; /* After gate vma */
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2014-10-13 18:18 [merged] fs-proc-task_mmuc-simplify-m_start-to-make-it-readable.patch removed from -mm tree akpm
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