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linux/arch/riscv/include
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Conor Dooley 2a8db5ec4a
 RISC-V: Don't check text_mutex during stop_machine 
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>
History 2023-03-09 14:58:51 -08:00
..
asm RISC-V: Don't check text_mutex during stop_machine 2023-03-09 14:58:51 -08:00
uapi/asm riscv: Bump COMMAND_LINE_SIZE value to 1024 2023-03-01 18:35:43 -08:00