The patch titled
Subject: fs/proc/task_mmu.c: shift "priv->task = NULL" from m_start() to m_stop()
has been added to the -mm tree. Its filename is
fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop.patch
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------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: fs/proc/task_mmu.c: shift "priv->task = NULL" from m_start() to m_stop()
1. There is no reason to reset ->tail_vma in m_start(), if we return
IS_ERR_OR_NULL() it won't be used.
2. m_start() also clears priv->task to ensure that m_stop() won't use
the stale pointer if we fail before get_task_struct(). But this is
ugly and confusing, move this initialization in m_stop().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff -puN fs/proc/task_mmu.c~fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop
+++ a/fs/proc/task_mmu.c
@@ -145,17 +145,12 @@ static void *m_start(struct seq_file *m,
struct vm_area_struct *vma, *tail_vma = NULL;
loff_t l = *pos;
- /* Clear the per syscall fields in priv */
- priv->task = NULL;
- priv->tail_vma = NULL;
-
/*
* We remember last_addr rather than next_addr to hit with
* vmacache most of the time. We have zero last_addr at
* the beginning and also after lseek. We will have -1 last_addr
* after the end of the vmas.
*/
-
if (last_addr == -1UL)
return NULL;
@@ -227,8 +222,10 @@ static void m_stop(struct seq_file *m, v
if (!IS_ERR_OR_NULL(v))
vma_stop(priv);
- if (priv->task)
+ if (priv->task) {
put_task_struct(priv->task);
+ priv->task = NULL;
+ }
}
static int proc_maps_open(struct inode *inode, struct file *file,
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
earlyprintk-re-enable-earlyprintk-calling-early_param.patch
fs-proc-task_mmuc-dont-use-task-mm-in-m_start-and-show_map.patch
fs-proc-task_mmuc-unify-simplify-do_maps_open-and-numa_maps_open.patch
proc-introduce-proc_mem_open.patch
fs-proc-task_mmuc-shift-mm_access-from-m_start-to-proc_maps_open.patch
fs-proc-task_mmuc-simplify-the-vma_stop-logic.patch
fs-proc-task_mmuc-cleanup-the-tail_vma-horror-in-m_next.patch
fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop.patch
fs-proc-task_mmuc-kill-the-suboptimal-and-confusing-m-version-logic.patch
fs-proc-task_mmuc-simplify-m_start-to-make-it-readable.patch
fs-proc-task_mmuc-introduce-m_next_vma-helper.patch
fs-proc-task_mmuc-reintroduce-m-version-logic.patch
fs-proc-task_mmuc-update-m-version-in-the-main-loop-in-m_start.patch
fs-proc-task_nommuc-change-maps_open-to-use-__seq_open_private.patch
fs-proc-task_nommuc-shift-mm_access-from-m_start-to-proc_maps_open.patch
fs-proc-task_nommuc-dont-use-priv-task-mm.patch
linux-next.patch
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