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task_work-2021-01-19

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Merge tag 'task_work-2021-01-19' of git://git.kernel.dk/linux-block

Pull task_work fix from Jens Axboe:
 "The TIF_NOTIFY_SIGNAL change inadvertently removed the unconditional
  task_work run we had in get_signal().

  This caused a regression for some setups, since we're relying on eg
  ____fput() being run to close and release, for example, a pipe and
  wake the other end.

  For 5.11, I prefer the simple solution of just reinstating the
  unconditional run, even if it conceptually doesn't make much sense -
  if you need that kind of guarantee, you should be using TWA_SIGNAL
  instead of TWA_NOTIFY. But it's the trivial fix for 5.11, and would
  ensure that other potential gotchas/assumptions for task_work don't
  regress for 5.11.

  We're looking into further simplifying the task_work notifications for
  5.12 which would resolve that too"

* tag 'task_work-2021-01-19' of git://git.kernel.dk/linux-block:
  task_work: unconditionally run task_work from get_signal()
This commit is contained in:
Linus Torvalds 2021-01-19 13:26:05 -08:00
parent f419f031de 35d0b389f3
commit 45dfb8a565
1 changed files with 3 additions and 0 deletions
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3
kernel/signal.c
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@ -2550,6 +2550,9 @@ bool get_signal(struct ksignal *ksig)
struct signal_struct *signal = current->signal;
int signr;
if (unlikely(current->task_works))
task_work_run();
/*
* For non-generic architectures, check for TIF_NOTIFY_SIGNAL so
* that the arch handlers don't all have to do it. If we get here