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authorEric W. Biederman <ebiederm@xmission.com>2022-04-12 10:18:48 -0500
committerEric W. Biederman <ebiederm@xmission.com>2022-05-07 09:01:59 -0500
commit5bd2e97c868a8a44470950ed01846cab6328e540 (patch)
tree7919866d9e44b6c98bfe16f6ac436013ce9e75c0 /arch/nios2
parent36cb0e1cda645ee645b85a6ce652cb46a16e14e5 (diff)
downloadlwn-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.c7
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;