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| author | Eric W. Biederman <ebiederm@xmission.com> | 2022-04-12 18:18:48 +0300 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2022-05-07 17:01:59 +0300 |
| commit | 5bd2e97c868a8a44470950ed01846cab6328e540 (patch) | |
| tree | 7919866d9e44b6c98bfe16f6ac436013ce9e75c0 /arch/openrisc | |
| parent | 36cb0e1cda645ee645b85a6ce652cb46a16e14e5 (diff) | |
| download | linux-5bd2e97c868a8a44470950ed01846cab6328e540.tar.xz | |
fork: Generalize PF_IO_WORKER handling
Add fn and fn_arg members into struct kernel_clone_args and test for
them in copy_thread (instead of testing for PF_KTHREAD | PF_IO_WORKER).
This allows any task that wants to be a user space task that only runs
in kernel mode to use this functionality.
The code on x86 is an exception and still retains a PF_KTHREAD test
because x86 unlikely everything else handles kthreads slightly
differently than user space tasks that start with a function.
The functions that created tasks that start with a function
have been updated to set ".fn" and ".fn_arg" instead of
".stack" and ".stack_size". These functions are fork_idle(),
create_io_thread(), kernel_thread(), and user_mode_thread().
Link: https://lkml.kernel.org/r/20220506141512.516114-4-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'arch/openrisc')
| -rw-r--r-- | arch/openrisc/kernel/process.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c index 486e46dd5883..d9697cc9bc4d 100644 --- a/arch/openrisc/kernel/process.c +++ b/arch/openrisc/kernel/process.c @@ -156,7 +156,6 @@ copy_thread(struct task_struct *p, const struct kernel_clone_args *args) { unsigned long clone_flags = args->flags; unsigned long usp = args->stack; - unsigned long arg = args->stack_size; unsigned long tls = args->tls; struct pt_regs *userregs; struct pt_regs *kregs; @@ -175,10 +174,10 @@ copy_thread(struct task_struct *p, const struct kernel_clone_args *args) sp -= sizeof(struct pt_regs); kregs = (struct pt_regs *)sp; - if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { + if (unlikely(args->fn)) { memset(kregs, 0, sizeof(struct pt_regs)); - kregs->gpr[20] = usp; /* fn, kernel thread */ - kregs->gpr[22] = arg; + kregs->gpr[20] = (unsigned long)args->fn; + kregs->gpr[22] = (unsigned long)args->fn_arg; } else { *userregs = *current_pt_regs(); |