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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/arc
parent36cb0e1cda645ee645b85a6ce652cb46a16e14e5 (diff)
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/arc')
-rw-r--r--arch/arc/kernel/process.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index caf948ba647c..3369f0700702 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -166,7 +166,6 @@ 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 kthread_arg = args->stack_size;
unsigned long tls = args->tls;
struct pt_regs *c_regs; /* child's pt_regs */
unsigned long *childksp; /* to unwind out of __switch_to() */
@@ -193,11 +192,11 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
childksp[0] = 0; /* fp */
childksp[1] = (unsigned long)ret_from_fork; /* blink */
- if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
+ if (unlikely(args->fn)) {
memset(c_regs, 0, sizeof(struct pt_regs));
- c_callee->r13 = kthread_arg;
- c_callee->r14 = usp; /* function */
+ c_callee->r13 = (unsigned long)args->fn_arg;
+ c_callee->r14 = (unsigned long)args->fn;
return 0;
}