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[ Upstream commit 2a8db5ec4a28a0fce822d10224db9471a44b6925 ]
We're currently using stop_machine() to update ftrace & kprobes, which
means that the thread that takes text_mutex during may not be the same
as the thread that eventually patches the code. This isn't actually a
race because the lock is still held (preventing any other concurrent
accesses) and there is only one thread running during stop_machine(),
but it does trigger a lockdep failure.
This patch just elides the lockdep check during stop_machine.
Fixes: c15ac4fd60 ("riscv/ftrace: Add dynamic function tracer support")
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Reported-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230303143754.4005217-1-conor.dooley@microchip.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
15 lines
314 B
C
15 lines
314 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020 SiFive
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*/
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#ifndef _ASM_RISCV_PATCH_H
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#define _ASM_RISCV_PATCH_H
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int patch_text_nosync(void *addr, const void *insns, size_t len);
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int patch_text(void *addr, u32 insn);
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extern int riscv_patch_in_stop_machine;
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#endif /* _ASM_RISCV_PATCH_H */
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