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authorEric W. Biederman <ebiederm@xmission.com>2022-04-12 18:18:48 +0300
committerEric W. Biederman <ebiederm@xmission.com>2022-05-07 17:01:59 +0300
commit5bd2e97c868a8a44470950ed01846cab6328e540 (patch)
tree7919866d9e44b6c98bfe16f6ac436013ce9e75c0 /arch/hexagon/kernel
parent36cb0e1cda645ee645b85a6ce652cb46a16e14e5 (diff)
downloadlinux-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/hexagon/kernel')
-rw-r--r--arch/hexagon/kernel/process.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/hexagon/kernel/process.c b/arch/hexagon/kernel/process.c
index f1c1f6f21941..f0552f98a7ba 100644
--- a/arch/hexagon/kernel/process.c
+++ b/arch/hexagon/kernel/process.c
@@ -54,7 +54,6 @@ 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 thread_info *ti = task_thread_info(p);
struct hexagon_switch_stack *ss;
@@ -76,11 +75,11 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
sizeof(*ss));
ss->lr = (unsigned long)ret_from_fork;
p->thread.switch_sp = ss;
- if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
+ if (unlikely(args->fn)) {
memset(childregs, 0, sizeof(struct pt_regs));
/* r24 <- fn, r25 <- arg */
- ss->r24 = usp;
- ss->r25 = arg;
+ ss->r24 = (unsigned long)args->fn;
+ ss->r25 = (unsigned long)args->fn_arg;
pt_set_kmode(childregs);
return 0;
}