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| author | Eric W. Biederman <ebiederm@xmission.com> | 2022-04-12 10:18:48 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2022-05-07 09:01:59 -0500 |
| commit | 5bd2e97c868a8a44470950ed01846cab6328e540 (patch) | |
| tree | 7919866d9e44b6c98bfe16f6ac436013ce9e75c0 /arch/nios2 | |
| parent | 36cb0e1cda645ee645b85a6ce652cb46a16e14e5 (diff) | |
| download | lwn-5bd2e97c868a8a44470950ed01846cab6328e540.tar.gz lwn-5bd2e97c868a8a44470950ed01846cab6328e540.zip | |
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/nios2')
| -rw-r--r-- | arch/nios2/kernel/process.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/nios2/kernel/process.c b/arch/nios2/kernel/process.c index 98c4bfe972e0..29593b98567d 100644 --- a/arch/nios2/kernel/process.c +++ b/arch/nios2/kernel/process.c @@ -104,7 +104,6 @@ int 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 *childregs = task_pt_regs(p); struct pt_regs *regs; @@ -112,12 +111,12 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) struct switch_stack *childstack = ((struct switch_stack *)childregs) - 1; - if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { + if (unlikely(args->fn)) { memset(childstack, 0, sizeof(struct switch_stack) + sizeof(struct pt_regs)); - childstack->r16 = usp; /* fn */ - childstack->r17 = arg; + childstack->r16 = (unsigned long) args->fn; + childstack->r17 = (unsigned long) args->fn_arg; childstack->ra = (unsigned long) ret_from_kernel_thread; childregs->estatus = STATUS_PIE; childregs->sp = (unsigned long) childstack; |