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linux/arch/riscv
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Conor Dooley 0a6321657e RISC-V: Don't check text_mutex during stop_machine 
[ Upstream commit 2a8db5ec4a ]

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>
History 2023-03-17 08:50:29 +01:00
..
boot riscv: dts: sifive: fu740: fix size of pcie 32bit memory 2023-01-24 07:24:37 +01:00
configs riscv: enable CD-ROM file systems in defconfig 2022-08-25 17:01:09 -07:00
errata Merge patch series "Some style cleanups for recent extension additions" 2022-10-13 08:46:31 -07:00
include RISC-V: Don't check text_mutex during stop_machine 2023-03-17 08:50:29 +01:00
kernel RISC-V: Don't check text_mutex during stop_machine 2023-03-17 08:50:29 +01:00
kvm RISC-V: KVM: Fix reg_val check in kvm_riscv_vcpu_set_reg_config() 2022-12-31 13:32:51 +01:00
lib riscv: lib: uaccess: fix CSR_STATUS SR_SUM bit 2022-08-10 14:06:31 -07:00
mm riscv, mm: Perform BPF exhandler fixup on page fault 2023-03-10 09:34:30 +01:00
net riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO_FUNC 2022-12-31 13:32:23 +01:00
purgatory riscv/purgatory: Omit use of bin2c 2022-08-11 09:32:34 -07:00
Kbuild riscv: move errata/ and kvm/ builds to arch/riscv/Kbuild 2022-06-01 22:26:32 -07:00
Kconfig riscv: Fixup compile error with !MMU 2023-01-07 11:11:53 +01:00
Kconfig.debug RISC-V: Remove EARLY_PRINTK support 2018-12-17 10:23:46 -08:00
Kconfig.erratas riscv: make t-head erratas depend on MMU 2022-09-17 01:48:22 -07:00
Kconfig.socs riscv: Kconfig: Style cleanups 2022-06-30 19:26:16 -07:00
Makefile RISC-V: Stop emitting attributes 2023-03-17 08:50:14 +01:00