Merge SA_IMMUTABLE-fixes-for-v5.16-rc2

I completed the first batch of signal changes for v5.17 against
v5.16-rc1 before the SA_IMMUTABLE fixes where completed.  Which leaves
me with two lines of development that I want on my signal development
branch both rooted at v5.16-rc1.  Especially as I am hoping
to reach the point of being able to remove SA_IMMUTABLE.

Linus merged my SA_IMUTABLE fixes as:
7af959b5d5c8 ("Merge branch 'SA_IMMUTABLE-fixes-for-v5.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace")

To avoid rebasing the development changes that are currently complete I am
merging the work I sent upstream to Linus to make my life simpler.

The SA_IMMUTABLE changes as they are described in Linus's merge commit.

Pull exit-vs-signal handling fixes from Eric Biederman:
 "This is a small set of changes where debuggers were no longer able to
  intercept synchronous SIGTRAP and SIGSEGV, introduced by the exit
  cleanups.

  This is essentially the change you suggested with all of i's dotted
  and the t's crossed so that ptrace can intercept all of the cases it
  has been able to intercept the past, and all of the cases that made it
  to exit without giving ptrace a chance still don't give ptrace a
  chance"

* 'SA_IMMUTABLE-fixes-for-v5.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  signal: Replace force_fatal_sig with force_exit_sig when in doubt
  signal: Don't always set SA_IMMUTABLE for forced signals

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

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