From 3129863bc784ac6c0ed1ec307a97f7e67e49e55e Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 21 Sep 2011 19:57:12 +0200 Subject: [PATCH 100/158] signal: Revert ptrace preempt magic 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(-) Index: linux-5.15.19-rt29/kernel/signal.c =================================================================== --- linux-5.15.19-rt29.orig/kernel/signal.c +++ linux-5.15.19-rt29/kernel/signal.c @@ -2296,16 +2296,8 @@ static void ptrace_stop(int exit_code, i 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 {