Messages in this thread | | | From | guoren@kernel ... | Subject | [PATCH V2 0/3] riscv: ftrace: Fixup ftrace detour code | Date | Tue, 20 Sep 2022 23:49:07 -0400 |
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From: Guo Ren <guoren@linux.alibaba.com>
The previous ftrace detour implementation fc76b8b8011 ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT") contain three problems. The most horrible bug is preemption panic which found by Andy [1]. Let's disable preemption for ftrace first, and Andy could continue the ftrace preemption work.
[1]: https://lpc.events/event/16/contributions/1171/
V2: - Add Signed-off for preemption fixup.
V1: https://lore.kernel.org/linux-riscv/20220916103817.9490-1-guoren@kernel.org/
Andy Chiu (1): riscv: ftrace: Fixup panic by disabling preemption
Guo Ren (2): riscv: ftrace: Remove wasted nops for !RISCV_ISA_C riscv: ftrace: Reduce the detour code size to half
arch/riscv/Kconfig | 2 +- arch/riscv/Makefile | 6 ++- arch/riscv/include/asm/ftrace.h | 46 ++++++++++++++++++----- arch/riscv/kernel/ftrace.c | 65 ++++++++++----------------------- arch/riscv/kernel/mcount-dyn.S | 43 +++++++++------------- 5 files changed, 78 insertions(+), 84 deletions(-)
-- 2.36.1
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