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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/nds32/kernel/process.c
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@@ -9,14 +9,15 @@
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 #include <linux/uaccess.h>
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 #include <asm/elf.h>
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 #include <asm/proc-fns.h>
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+#include <asm/fpu.h>
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 #include <linux/ptrace.h>
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 #include <linux/reboot.h>
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15
 
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-extern void setup_mm_for_reboot(char mode);
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-#ifdef CONFIG_PROC_FS
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-struct proc_dir_entry *proc_dir_cpu;
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-EXPORT_SYMBOL(proc_dir_cpu);
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+#if IS_ENABLED(CONFIG_LAZY_FPU)
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+struct task_struct *last_task_used_math;
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 #endif
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+
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+extern void setup_mm_for_reboot(char mode);
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 extern inline void arch_reset(char mode)
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 {
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@@ -120,26 +121,42 @@
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 		regs->uregs[3], regs->uregs[2], regs->uregs[1], regs->uregs[0]);
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 	pr_info("  IRQs o%s  Segment %s\n",
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 		interrupts_enabled(regs) ? "n" : "ff",
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-		segment_eq(get_fs(), get_ds())? "kernel" : "user");
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+		uaccess_kernel() ? "kernel" : "user");
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 }
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 EXPORT_SYMBOL(show_regs);
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+void exit_thread(struct task_struct *tsk)
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+{
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+#if defined(CONFIG_FPU) && defined(CONFIG_LAZY_FPU)
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+	if (last_task_used_math == tsk)
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+		last_task_used_math = NULL;
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+#endif
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+}
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+
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 void flush_thread(void)
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 {
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+#if defined(CONFIG_FPU)
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+	clear_fpu(task_pt_regs(current));
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+	clear_used_math();
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+# ifdef CONFIG_LAZY_FPU
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+	if (last_task_used_math == current)
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+		last_task_used_math = NULL;
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+# endif
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+#endif
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 }
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148
 
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 DEFINE_PER_CPU(struct task_struct *, __entry_task);
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150
 
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 asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
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 int copy_thread(unsigned long clone_flags, unsigned long stack_start,
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-	    unsigned long stk_sz, struct task_struct *p)
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+		unsigned long stk_sz, 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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156
 
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 	memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context));
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158
 
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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(childregs, 0, sizeof(struct pt_regs));
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 		/* kernel thread fn */
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 		p->thread.cpu_context.r6 = stack_start;
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@@ -153,11 +170,27 @@
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 		childregs->uregs[0] = 0;
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 		childregs->osp = 0;
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 		if (clone_flags & CLONE_SETTLS)
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-			childregs->uregs[25] = childregs->uregs[3];
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+			childregs->uregs[25] = tls;
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 	}
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 	/* cpu context switching  */
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 	p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
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 	p->thread.cpu_context.sp = (unsigned long)childregs;
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+
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+#if IS_ENABLED(CONFIG_FPU)
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+	if (used_math()) {
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+# if !IS_ENABLED(CONFIG_LAZY_FPU)
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+		unlazy_fpu(current);
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+# else
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+		preempt_disable();
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+		if (last_task_used_math == current)
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+			save_fpu(current);
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+		preempt_enable();
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+# endif
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+		p->thread.fpu = current->thread.fpu;
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+		clear_fpu(task_pt_regs(p));
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+		set_stopped_child_used_math(p);
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+	}
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+#endif
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 #ifdef CONFIG_HWZOL
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 	childregs->lb = 0;
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@@ -168,12 +201,33 @@
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 	return 0;
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 }
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+#if IS_ENABLED(CONFIG_FPU)
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+struct task_struct *_switch_fpu(struct task_struct *prev, struct task_struct *next)
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+{
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+#if !IS_ENABLED(CONFIG_LAZY_FPU)
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+	unlazy_fpu(prev);
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+#endif
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+	if (!(next->flags & PF_KTHREAD))
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+		clear_fpu(task_pt_regs(next));
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+	return prev;
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+}
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+#endif
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+
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 /*
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  * fill in the fpe structure for a core dump...
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  */
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 int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpu)
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 {
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 	int fpvalid = 0;
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+#if IS_ENABLED(CONFIG_FPU)
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+	struct task_struct *tsk = current;
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+
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+	fpvalid = tsk_used_math(tsk);
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+	if (fpvalid) {
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+		lose_fpu();
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+		memcpy(fpu, &tsk->thread.fpu, sizeof(*fpu));
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+	}
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+#endif
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 	return fpvalid;
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 }
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