From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 31 Oct 2023 03:03:32 +0000 (-1000)
Subject: Merge tag 'core-core-2023-10-29-v2' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9cc6fea175e41580000419a90fa744ba46aa4722;p=linux.git

Merge tag 'core-core-2023-10-29-v2' of git://git./linux/kernel/git/tip/tip

Pull core updates from Thomas Gleixner:
 "Two small updates to ptrace_stop():

   - Add a comment to explain that the preempt_disable() before
     unlocking tasklist lock is not a correctness problem and just
     avoids the tracer to preempt the tracee before the tracee schedules
     out.

   - Make that preempt_disable() conditional on PREEMPT_RT=n.

     RT enabled kernels cannot disable preemption at this point because
     cgroup_enter_frozen() and sched_submit_work() acquire spinlocks or
     rwlocks which are substituted by sleeping locks on RT. Acquiring a
     sleeping lock in a preemption disable region is obviously not
     possible.

     This obviously brings back the potential slowdown of ptrace() for
     RT enabled kernels, but that's a price to be paid for latency
     guarantees"

* tag 'core-core-2023-10-29-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  signal: Don't disable preemption in ptrace_stop() on PREEMPT_RT
  signal: Add a proper comment about preempt_disable() in ptrace_stop()
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9cc6fea175e41580000419a90fa744ba46aa4722