Merge patch series "riscv: Optimize function trace"

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guoren@kernel.org <guoren@kernel.org> says:

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.
 - The "-fpatchable-function-entry= CFLAG" wasted code size
   !RISCV_ISA_C.
 - The ftrace detour implementation wasted code size.
 - When livepatching, the trampoline (ftrace_regs_caller) would not
   return to <func_prolog+12> but would rather jump to the new function.
   So, "REG_L ra, -SZREG(sp)" would not run and the original return
   address would not be restored. The kernel is likely to hang or crash
   as a result. (Found by Evgenii Shatokhin [4])

[Palmer: The first three patches in this series are pretty concrete
fixes, so I'm pulling them ahead of the rest of the series.]

* b4-shazam-merge:
  riscv: ftrace: Reduce the detour code size to half
  riscv: ftrace: Remove wasted nops for !RISCV_ISA_C
  riscv: ftrace: Fixup panic by disabling preemption

Link: https://lore.kernel.org/r/20230112090603.1295340-1-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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This commit is contained in:

Palmer Dabbelt 2023-02-15 10:57:13 -08:00

parent 9a5c09dd97 6724a76cff

commit ec6311919e

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2

arch/riscv/Kconfig

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arch/riscv/Makefile

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50

arch/riscv/include/asm/ftrace.h

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arch/riscv/kernel/ftrace.c

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arch/riscv/kernel/mcount-dyn.S

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