disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/arch/arm/kernel/stacktrace.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #include <linux/export.h>
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 #include <linux/sched.h>
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 #include <linux/sched/debug.h>
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@@ -52,17 +53,17 @@
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 		return -EINVAL;
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 	frame->sp = frame->fp;
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-	frame->fp = *(unsigned long *)(fp);
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-	frame->pc = *(unsigned long *)(fp + 4);
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+	frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp));
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+	frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 4));
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 #else
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 	/* check current frame pointer is within bounds */
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 	if (fp < low + 12 || fp > high - 4)
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 		return -EINVAL;
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 	/* restore the registers from the stack frame */
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-	frame->fp = *(unsigned long *)(fp - 12);
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-	frame->sp = *(unsigned long *)(fp - 8);
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-	frame->pc = *(unsigned long *)(fp - 4);
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+	frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 12));
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+	frame->sp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 8));
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+	frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 4));
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 #endif
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 	return 0;
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@@ -140,8 +141,6 @@
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 		 * running on another CPU?  For now, ignore it as we
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 		 * can't guarantee we won't explode.
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 		 */
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-		if (trace->nr_entries < trace->max_entries)
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-			trace->entries[trace->nr_entries++] = ULONG_MAX;
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 		return;
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 #else
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 		frame.fp = thread_saved_fp(tsk);
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@@ -159,8 +158,6 @@
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 	}
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 	walk_stackframe(&frame, save_trace, &data);
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-	if (trace->nr_entries < trace->max_entries)
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-		trace->entries[trace->nr_entries++] = ULONG_MAX;
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 }
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 void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
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@@ -178,8 +175,6 @@
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 	frame.pc = regs->ARM_pc;
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 	walk_stackframe(&frame, save_trace, &data);
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-	if (trace->nr_entries < trace->max_entries)
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-		trace->entries[trace->nr_entries++] = ULONG_MAX;
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 }
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 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)