The patch titled
sys_get_robust_list(): don't take tasklist_lock
has been removed from the -mm tree. Its filename is
sys_get_robust_list-dont-take-tasklist_lock.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sys_get_robust_list(): don't take tasklist_lock
From: Oleg Nesterov <oleg@xxxxxxxxxx>
use rcu locks for find_task_by_pid().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/futex.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN kernel/futex.c~sys_get_robust_list-dont-take-tasklist_lock kernel/futex.c
--- a/kernel/futex.c~sys_get_robust_list-dont-take-tasklist_lock
+++ a/kernel/futex.c
@@ -1624,7 +1624,7 @@ sys_get_robust_list(int pid, struct robu
struct task_struct *p;
ret = -ESRCH;
- read_lock(&tasklist_lock);
+ rcu_read_lock();
p = find_task_by_pid(pid);
if (!p)
goto err_unlock;
@@ -1633,7 +1633,7 @@ sys_get_robust_list(int pid, struct robu
!capable(CAP_SYS_PTRACE))
goto err_unlock;
head = p->robust_list;
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
}
if (put_user(sizeof(*head), len_ptr))
@@ -1641,7 +1641,7 @@ sys_get_robust_list(int pid, struct robu
return put_user(head, head_ptr);
err_unlock:
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
return ret;
}
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
git-block.patch
proc-readdir-race-fix-take-3-race-fix.patch
vt-rework-the-console-spawning-variables.patch
vt-make-vt_pid-a-struct-pid-making-it-pid-wrap-around-safe.patch
simplify-pid-iterators.patch
file-add-locking-to-f_getown.patch
proc-convert-task_sig-to-use-lock_task_sighand.patch
proc-convert-do_task_stat-to-use-lock_task_sighand.patch
proc-drop-tasklist-lock-in-task_state.patch
proc-properly-compute-tgid_offset.patch
proc-remove-trailing-blank-entry-from-pid_entry-arrays.patch
proc-remove-the-useless-smp-safe-comments-from-proc.patch
proc-comment-what-proc_fill_cache-does.patch
introduce-get_task_pid-to-fix-unsafe-get_pid.patch
rcu-simplify-improve-batch-tuning.patch
pidhash-temporary-debug-checks.patch
-
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