Eric Lee / smarc-fsl-linux-kernel

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Commit aaa2a97eb9c0e91d7abc66bf76811a9599fdb3ee

Authored by Oleg Nesterov
Committed by Linus Torvalds
1 parent d359b549bf
Exists in master and in 39 other branches 8mp-imx_5.4.70_2.3.0, 8qm-imx_5.4.70_2.3.0, emb_imx_lf-5.15.y, emb_lf-6.1.y, imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, imx_4.1.15_1.0.0_ga, pitx_8mp_lf-5.10.y, rt-smarc-imx_4.1.15_1.0.0_ga, rt_linux_5.15.71, smarc-8m-android-11.0.0_2.0.0, smarc-imx6_4.14.98_2.0.0_ga, smarc-imx6_4.9.88_2.0.0_ga, smarc-imx7_4.14.98_2.0.0_ga, smarc-imx7_4.9.11_1.0.0_ga, smarc-imx7_4.9.88_2.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-imx_4.1.15_1.0.0_ga, smarc-imx_4.9.11_1.0.0_ga, smarc-imx_4.9.51_imx8m_ga, smarc-imx_4.9.88_2.0.0_ga, smarc-m6.0.1_2.1.0-ga, smarc-n7.1.2_2.0.0-ga, smarc-rel_imx_4.1.15_1.2.0_ga, smarc_8m_00d0_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.14.78_1.0.0_ga, smarc_8m_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.19.35_1.1.0, smarc_8mm_imx_4.14.78_1.0.0_ga, smarc_8mm_imx_4.14.98_2.0.0_ga, smarc_8mm_imx_4.19.35_1.1.0, smarc_8mm_imx_5.4.24_2.1.0, smarc_8mp_lf-5.10.y, smarc_8mq_imx_5.4.24_2.1.0, smarc_8mq_lf-5.10.y, smarc_imx_lf-5.15.y

[PATCH] sys_get_robust_list(): don't take tasklist_lock 

use rcu locks for find_task_by_pid().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Showing 1 changed file with 3 additions and 3 deletions Side-by-side Diff

... ... @@ -1624,7 +1624,7 @@
1624 1624 struct task_struct *p;
1625 1625  
1626 1626 ret = -ESRCH;
1627   - read_lock(&tasklist_lock);
  1627 + rcu_read_lock();
1628 1628 p = find_task_by_pid(pid);
1629 1629 if (!p)
1630 1630 goto err_unlock;
... ... @@ -1633,7 +1633,7 @@
1633 1633 !capable(CAP_SYS_PTRACE))
1634 1634 goto err_unlock;
1635 1635 head = p->robust_list;
1636   - read_unlock(&tasklist_lock);
  1636 + rcu_read_unlock();
1637 1637 }
1638 1638  
1639 1639 if (put_user(sizeof(*head), len_ptr))
... ... @@ -1641,7 +1641,7 @@
1641 1641 return put_user(head, head_ptr);
1642 1642  
1643 1643 err_unlock:
1644   - read_unlock(&tasklist_lock);
  1644 + rcu_read_unlock();
1645 1645  
1646 1646 return ret;
1647 1647 }