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370a3b8f58
We can see the following messages with CONFIG_PROVE_LOCKING=y on
LoongArch:
BUG: MAX_STACK_TRACE_ENTRIES too low!
turning off the locking correctness validator.
This is because stack_trace_save() returns a big value after call
arch_stack_walk(), here is the call trace:
save_trace()
stack_trace_save()
arch_stack_walk()
stack_trace_consume_entry()
arch_stack_walk() should return immediately if unwind_next_frame()
failed, no need to do the useless loops to increase the value of c->len
in stack_trace_consume_entry(), then we can fix the above problem.
Cc: stable@vger.kernel.org
Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/all/8a44ad71-68d2-4926-892f-72bfc7a67e2a@roeck-us.net/
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
34 lines
764 B
C
34 lines
764 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2022-2023 Loongson Technology Corporation Limited
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*/
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#include <linux/kernel.h>
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#include <linux/ftrace.h>
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#include <asm/unwind.h>
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bool default_next_frame(struct unwind_state *state)
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{
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struct stack_info *info = &state->stack_info;
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unsigned long addr;
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if (unwind_done(state))
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return false;
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do {
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for (state->sp += sizeof(unsigned long);
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state->sp < info->end; state->sp += sizeof(unsigned long)) {
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addr = *(unsigned long *)(state->sp);
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state->pc = unwind_graph_addr(state, addr, state->sp + 8);
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if (__kernel_text_address(state->pc))
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return true;
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}
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state->sp = info->next_sp;
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} while (!get_stack_info(state->sp, state->task, info));
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state->error = true;
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return false;
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}
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