Upstream commit 53da1d9456fe7f8 ("fix ptrace slowness") introduced
preempt_disable() and preempt_enable_no_resched() in function
ptrace_stop(), and they should be used together.
In RT kernel, commit 500d5c546e46 ("signal: Revert ptrace preempt
magic") reverted commit 53da1d9456fe7f8. To make Yocto RT kernel the
same as upstream RT kernel, remove preempt_enable_no_resched(), in
stread of adding preempt_disable().
Signed-off-by: Yongxin Liu <yongxin....@windriver.com>
---
kernel/signal.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index 4e7dddf6b3a9..7bf4b399d307 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2243,7 +2243,6 @@ static void ptrace_stop(int exit_code, int why, int
clear_code, kernel_siginfo_t
read_unlock(&tasklist_lock);
cgroup_enter_frozen();
- preempt_enable_no_resched();
freezable_schedule();
cgroup_leave_frozen(true);
} else {
--
2.14.4
--
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