diff options
Diffstat (limited to 'features/rt/signal-Revert-ptrace-preempt-magic.patch')
-rw-r--r-- | features/rt/signal-Revert-ptrace-preempt-magic.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/features/rt/signal-Revert-ptrace-preempt-magic.patch b/features/rt/signal-Revert-ptrace-preempt-magic.patch new file mode 100644 index 00000000..2408f040 --- /dev/null +++ b/features/rt/signal-Revert-ptrace-preempt-magic.patch @@ -0,0 +1,38 @@ +From 06589e25a1763adbe6ac70a0cb1ab769704163ec Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Wed, 21 Sep 2011 19:57:12 +0200 +Subject: [PATCH 083/191] 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 <tglx@linutronix.de> +--- + kernel/signal.c | 8 -------- + 1 file changed, 8 deletions(-) + +diff --git a/kernel/signal.c b/kernel/signal.c +index ba4d1ef39a9e..98c48e1ea82e 100644 +--- a/kernel/signal.c ++++ b/kernel/signal.c +@@ -2203,16 +2203,8 @@ 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 { +-- +2.19.1 + |