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Date: Tue, 20 Sep 2022 23:49:07 -0400
From: guoren@...nel.org
To: arnd@...db.de, palmer@...osinc.com, rostedt@...dmis.org,
andy.chiu@...ive.com, greentime.hu@...ive.com, zong.li@...ive.com,
jrtc27@...c27.com, mingo@...hat.com, palmer@...belt.com
Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org, guoren@...nel.org,
Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V2 0/3] riscv: ftrace: Fixup ftrace detour code
From: Guo Ren <guoren@...ux.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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