From 3d8d7beacea4da55fdd1b45bc8d5c19da1438dcb Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 21 Sep 2011 19:57:12 +0200 Subject: [PATCH 178/323] signal: Revert ptrace preempt magic Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz Upstream commit '53da1d9456fe7f8 fix ptrace slowness' is nothing more than a bandaid around the ptrace design trainwreck. It's not a correctness issue, it's merily a cosmetic bandaid. Signed-off-by: Thomas Gleixner --- kernel/signal.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/kernel/signal.c b/kernel/signal.c index e487c4660921..5ab628e2afc5 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2193,16 +2193,8 @@ static void ptrace_stop(int exit_code, int why, int clear_code, kernel_siginfo_t if (gstop_done && ptrace_reparented(current)) do_notify_parent_cldstop(current, false, why); - /* - * Don't want to allow preemption here, because - * sys_ptrace() needs this task to be inactive. - * - * XXX: implement read_unlock_no_resched(). - */ - preempt_disable(); read_unlock(&tasklist_lock); cgroup_enter_frozen(); - preempt_enable_no_resched(); freezable_schedule(); cgroup_leave_frozen(true); } else { -- 2.43.0