add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nios2/kernel/process.c
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@@ -33,7 +33,7 @@
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 void arch_cpu_idle(void)
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 {
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-	local_irq_enable();
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+	raw_local_irq_enable();
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 }
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 /*
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@@ -100,8 +100,8 @@
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 {
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 }
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-int copy_thread(unsigned long clone_flags,
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-		unsigned long usp, unsigned long arg, struct task_struct *p)
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+int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg,
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+		struct task_struct *p, unsigned long tls)
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 {
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 	struct pt_regs *childregs = task_pt_regs(p);
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 	struct pt_regs *regs;
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@@ -109,7 +109,7 @@
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 	struct switch_stack *childstack =
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 		((struct switch_stack *)childregs) - 1;
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-	if (unlikely(p->flags & PF_KTHREAD)) {
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+	if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
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 		memset(childstack, 0,
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 			sizeof(struct switch_stack) + sizeof(struct pt_regs));
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@@ -140,7 +140,7 @@
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 	/* Initialize tls register. */
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 	if (clone_flags & CLONE_SETTLS)
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-		childstack->r23 = regs->r8;
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+		childstack->r23 = tls;
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 	return 0;
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 }
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@@ -252,10 +252,19 @@
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 	regs->sp = sp;
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 }
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-#include <linux/elfcore.h>
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-
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-/* Fill in the FPU structure for a core dump. */
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-int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
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+asmlinkage int nios2_clone(unsigned long clone_flags, unsigned long newsp,
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+			   int __user *parent_tidptr, int __user *child_tidptr,
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+			   unsigned long tls)
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 {
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-	return 0; /* Nios2 has no FPU and thus no FPU registers */
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+	struct kernel_clone_args args = {
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+		.flags		= (lower_32_bits(clone_flags) & ~CSIGNAL),
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+		.pidfd		= parent_tidptr,
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+		.child_tid	= child_tidptr,
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+		.parent_tid	= parent_tidptr,
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+		.exit_signal	= (lower_32_bits(clone_flags) & CSIGNAL),
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+		.stack		= newsp,
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+		.tls		= tls,
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+	};
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+
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+	return kernel_clone(&args);
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 }