Christian Brauner cad6967ac1
fork: introduce kernel_clone() ...
The old _do_fork() helper doesn't follow naming conventions of in-kernel
helpers for syscalls. The process creation cleanup in [1] didn't change the
name to something more reasonable mainly because _do_fork() was used in quite a
few places. So sending this as a separate series seemed the better strategy.
This commit does two things:
1. renames _do_fork() to kernel_clone() but keeps _do_fork() as a simple static
inline wrapper around kernel_clone().
2. Changes the return type from long to pid_t. This aligns kernel_thread() and
kernel_clone(). Also, the return value from kernel_clone that is surfaced in
fork(), vfork(), clone(), and clone3() is taken from pid_vrn() which returns
a pid_t too.
Follow-up patches will switch each caller of _do_fork() and each place where it
is referenced over to kernel_clone(). After all these changes are done, we can
remove _do_fork() completely and will only be left with kernel_clone().
[1]: 9ba27414f2christian.brauner@ubuntu.com >
Cc: Thomas Gleixner <tglx@linutronix.de >
Cc: Ingo Molnar <mingo@kernel.org >
Cc: Matthew Wilcox (Oracle) <willy@infradead.org >
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org >
Link: https://lore.kernel.org/r/20200819104655.436656-2-christian.brauner@ubuntu.com
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cad6967ac1