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kernel: Remove signal hacks for vhost_tasks

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This removes the signal/coredump hacks added for vhost_tasks in:

Commit f9010dbdce ("fork, vhost: Use CLONE_THREAD to fix freezer/ps regression")

When that patch was added vhost_tasks did not handle SIGKILL and would
try to ignore/clear the signal and continue on until the device's close
function was called. In the previous patches vhost_tasks and the vhost
drivers were converted to support SIGKILL by cleaning themselves up and
exiting. The hacks are no longer needed so this removes them.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Message-Id: <20240316004707.45557-10-michael.christie@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Mike Christie 2024-03-15 19:47:07 -05:00 committed by Michael S. Tsirkin
parent db5247d9bf
commit 240a1853b4
3 changed files with 3 additions and 10 deletions
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4
fs/coredump.c
View file

@ -371,9 +371,7 @@ static int zap_process(struct task_struct *start, int exit_code)
if (t != current && !(t->flags & PF_POSTCOREDUMP)) {
sigaddset(&t->pending.signal, SIGKILL);
signal_wake_up(t, 1);
/* The vhost_worker does not particpate in coredumps */
if ((t->flags & (PF_USER_WORKER | PF_IO_WORKER)) != PF_USER_WORKER)
nr++;
nr++;
}
}

5
kernel/exit.c
View file

@ -414,10 +414,7 @@ static void coredump_task_exit(struct task_struct *tsk)
tsk->flags |= PF_POSTCOREDUMP;
core_state = tsk->signal->core_state;
spin_unlock_irq(&tsk->sighand->siglock);
/* The vhost_worker does not particpate in coredumps */
if (core_state &&
((tsk->flags & (PF_IO_WORKER | PF_USER_WORKER)) != PF_USER_WORKER)) {
if (core_state) {
struct core_thread self;
self.task = current;

4
kernel/signal.c
View file

@ -1375,9 +1375,7 @@ int zap_other_threads(struct task_struct *p)
for_other_threads(p, t) {
task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);
/* Don't require de_thread to wait for the vhost_worker */
if ((t->flags & (PF_IO_WORKER | PF_USER_WORKER)) != PF_USER_WORKER)
count++;
count++;
/* Don't bother with already dead threads */
if (t->exit_state)