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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ 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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html