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fork: Explicity test for idle tasks in copy_thread

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The architectures ia64 and parisc have special handling for the idle
thread in copy_process.  Add a flag named idle to kernel_clone_args
and use it to explicity test if an idle process is being created.

Fullfill the expectations of the rest of the copy_thread
implemetations and pass a function pointer in .stack from fork_idle().
This makes what is happening in copy_thread better defined, and is
useful to make idle threads less special.

Link: https://lkml.kernel.org/r/20220506141512.516114-3-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2022-04-11 16:17:28 -05:00
parent c5febea095
commit 36cb0e1cda
4 changed files with 12 additions and 2 deletions
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include/linux/sched/task.h
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@@ -33,6 +33,7 @@ struct kernel_clone_args {
int cgroup;
int io_thread;
int kthread;
int idle;
struct cgroup *cgrp;
struct css_set *cset;
};