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authorEric W. Biederman <ebiederm@xmission.com>2017-06-04 11:32:13 +0200
committerEric W. Biederman <ebiederm@xmission.com>2018-07-21 17:43:12 +0200
commit6883f81aac6f44e7df70a6af189b3689ff52cbfb (patch)
tree184e376d23aa5ea7321e22f23dd78a3c77c74a63 /arch/ia64
parentpids: Move the pgrp and session pid pointers from task_struct to signal_struct (diff)
downloadlinux-6883f81aac6f44e7df70a6af189b3689ff52cbfb.tar.xz
linux-6883f81aac6f44e7df70a6af189b3689ff52cbfb.zip
pid: Implement PIDTYPE_TGID
Everywhere except in the pid array we distinguish between a tasks pid and a tasks tgid (thread group id). Even in the enumeration we want that distinction sometimes so we have added __PIDTYPE_TGID. With leader_pid we almost have an implementation of PIDTYPE_TGID in struct signal_struct. Add PIDTYPE_TGID as a first class member of the pid_type enumeration and into the pids array. Then remove the __PIDTYPE_TGID special case and the leader_pid in signal_struct. The net size increase is just an extra pointer added to struct pid and an extra pair of pointers of an hlist_node added to task_struct. The effect on code maintenance is the removal of a number of special cases today and the potential to remove many more special cases as PIDTYPE_TGID gets used to it's fullest. The long term potential is allowing zombie thread group leaders to exit, which will remove a lot more special cases in the code. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/asm-offsets.c2
-rw-r--r--arch/ia64/kernel/fsys.S4
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/ia64/kernel/asm-offsets.c b/arch/ia64/kernel/asm-offsets.c
index c1f8a57855af..00e8e2a1eb19 100644
--- a/arch/ia64/kernel/asm-offsets.c
+++ b/arch/ia64/kernel/asm-offsets.c
@@ -67,7 +67,7 @@ void foo(void)
DEFINE(IA64_SIGNAL_GROUP_STOP_COUNT_OFFSET,offsetof (struct signal_struct,
group_stop_count));
DEFINE(IA64_SIGNAL_SHARED_PENDING_OFFSET,offsetof (struct signal_struct, shared_pending));
- DEFINE(IA64_SIGNAL_LEADER_PID_OFFSET, offsetof (struct signal_struct, leader_pid));
+ DEFINE(IA64_SIGNAL_PIDS_TGID_OFFSET, offsetof (struct signal_struct, pids[PIDTYPE_TGID]));
BLANK();
diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
index e85ebdac678b..d80c99a5f55d 100644
--- a/arch/ia64/kernel/fsys.S
+++ b/arch/ia64/kernel/fsys.S
@@ -68,10 +68,10 @@ ENTRY(fsys_getpid)
add r9=TI_FLAGS+IA64_TASK_SIZE,r16
;;
ld4 r9=[r9]
- add r17=IA64_SIGNAL_LEADER_PID_OFFSET,r17
+ add r17=IA64_SIGNAL_PIDS_TGID_OFFSET,r17
;;
and r9=TIF_ALLWORK_MASK,r9
- ld8 r17=[r17] // r17 = current->signal->leader_pid
+ ld8 r17=[r17] // r17 = current->signal->pids[PIDTYPE_TGID]
;;
add r8=IA64_PID_LEVEL_OFFSET,r17
;;