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Subject[PATCH 00/20] PIDTYPE_TGID removal of fork restarts

This took longer than I thought to address all of the issues and double
check I am not missing something. I have split of a few of the patches
so now the patch series appears longer. It now covers less ground.

I realized while reviewing the group signals that for none of them is
siginfo important. Which means by slightly lowering our quality of
implementation in delivering those signals to a brand new process (by
not queueing siginfo) I can collect them all in a sigset and the code
is no more difficult than a sequence counter. Which means it is
straight forward to completely eliminate restarts from fork.

The implemenatation of PIDTYPE_TGID remains the same. How it gets used
has changed to guarantee that looking up a thread group by the pid of
one of it's threads and sending it a signal continues to work exactly
the same as before.

Please take a look and verify that I have caught everything. I think I
have but if not please let me know.

Thank you in advance,
Eric

Eric W. Biederman (20):
pids: Initialize leader_pid in init_task
pids: Move task_pid_type into sched/signal.h
pids: Compute task_tgid using signal->leader_pid
kvm: Don't open code task_pid in kvm_vcpu_ioctl
pids: Move the pgrp and session pid pointers from task_struct to signal_struct
pid: Implement PIDTYPE_TGID
signal: Use PIDTYPE_TGID to clearly store where file signals will be sent
posix-timers: Noralize good_sigevent
signal: Pass pid and pid type into send_sigqueue
signal: Pass pid type into group_send_sig_info
signal: Pass pid type into send_sigio_to_task & send_sigurg_to_task
signal: Pass pid type into do_send_sig_info
signal: Push pid type down into send_signal
signal: Push pid type down into __send_signal
signal: Push pid type down into complete_signal.
fork: Move and describe why the code examines PIDNS_ADDING
fork: Unconditionally exit if a fatal signal is pending
signal: Add calculate_sigpending()
fork: Have new threads join on-going signal group stops
signal: Don't restart fork when signals come in.

arch/ia64/kernel/asm-offsets.c | 4 +-
arch/ia64/kernel/fsys.S | 12 ++---
arch/s390/kernel/perf_cpum_sf.c | 2 +-
drivers/net/tun.c | 2 +-
drivers/platform/x86/thinkpad_acpi.c | 1 +
drivers/tty/sysrq.c | 2 +-
drivers/tty/tty_io.c | 2 +-
fs/autofs/autofs_i.h | 1 +
fs/exec.c | 1 +
fs/fcntl.c | 72 +++++++++++++--------------
fs/fuse/file.c | 1 +
fs/locks.c | 2 +-
fs/notify/dnotify/dnotify.c | 3 +-
fs/notify/fanotify/fanotify.c | 1 +
include/linux/init_task.h | 9 ----
include/linux/pid.h | 11 +----
include/linux/sched.h | 31 +++---------
include/linux/sched/signal.h | 49 +++++++++++++++++--
include/linux/signal.h | 6 ++-
include/net/scm.h | 1 +
init/init_task.c | 12 +++--
kernel/events/core.c | 2 +-
kernel/exit.c | 12 ++---
kernel/fork.c | 70 +++++++++++++++++++--------
kernel/pid.c | 42 ++++++++--------
kernel/signal.c | 94 ++++++++++++++++++++++++++----------
kernel/time/itimer.c | 5 +-
kernel/time/posix-cpu-timers.c | 2 +-
kernel/time/posix-timers.c | 21 ++++----
mm/oom_kill.c | 4 +-
virt/kvm/kvm_main.c | 2 +-
31 files changed, 282 insertions(+), 197 deletions(-)

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