add driver 5G

hc

2024-01-31 f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2

 kernel/arch/riscv/kernel/stacktrace.c
..
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@@ -57,9 +57,15 @@
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 		/* Unwind stack frame */
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 		frame = (struct stackframe *)fp - 1;
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 		sp = fp;
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-		fp = frame->fp;
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-		pc = ftrace_graph_ret_addr(current, NULL, frame->ra,
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-					   (unsigned long *)(fp - 8));
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+		if (regs && (regs->epc == pc) && (frame->fp & 0x7)) {
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+			fp = frame->ra;
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+			pc = regs->ra;
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+		} else {
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+			fp = frame->fp;
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+			pc = ftrace_graph_ret_addr(current, NULL, frame->ra,
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+						   &frame->ra);
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+		}
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+
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 	}
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 }
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..
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@@ -90,7 +96,7 @@
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 	while (!kstack_end(ksp)) {
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 		if (__kernel_text_address(pc) && unlikely(fn(pc, arg)))
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 			break;
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-		pc = (*ksp++) - 0x4;
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+		pc = READ_ONCE_NOCHECK(*ksp++) - 0x4;
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 	}
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 }
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