Messages in this thread | | | From | Mark Rutland <> | Subject | [PATCH 0/8] arm64: ftrace cleanup + FTRACE_WITH_REGS | Date | Mon, 21 Oct 2019 17:34:18 +0100 |
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Hi,
This series is a reworked version of Torsten's v8 FTRACE_WITH_REGS series [1]. I've tried to rework the existing code in preparatory patches so that the patchable-function-entry bits slot in with fewer surprises. This version is based on v5.4-rc3, and can be found in my arm64/ftrace-with-regs branch [2].
I've added an (optional) ftrace_init_nop(), which the core code uses to initialize callsites. This allows us to avoid a synthetic MCOUNT_ADDR symbol, and more cleanly separates the one-time initialization of the callsite from dynamic NOP<->CALL modification. Architectures which don't implement this get the existing ftrace_make_nop() with MCOUNT_ADDR.
I've moved the module PLT initialization to module load time, which simplifies runtime callsite modification. This also means that we don't transitently mark the module text RW, and will allow for the removal of module_disable_ro().
Since the last posting, parisc gained ftrace support using patchable-function-entry. I've made the handling of module callsite locations common in kernel/module.c with a new FTRACE_CALLSITE_SECTION definition, and removed the newly redundant bits from arch/parisc.
Thanks, Mark.
[1] https://lore.kernel.org/r/20190208150826.44EBC68DD2@newverein.lst.de [2] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/ftrace-with-regs
Mark Rutland (7): ftrace: add ftrace_init_nop() module/ftrace: handle patchable-function-entry arm64: module: rework special section handling arm64: module/ftrace: intialize PLT at load time arm64: insn: add encoder for MOV (register) arm64: asm-offsets: add S_FP arm64: ftrace: minimize ifdeffery
Torsten Duwe (1): arm64: implement ftrace with regs
arch/arm64/Kconfig | 2 + arch/arm64/Makefile | 5 ++ arch/arm64/include/asm/ftrace.h | 23 +++++++ arch/arm64/include/asm/insn.h | 3 + arch/arm64/include/asm/module.h | 2 +- arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kernel/entry-ftrace.S | 140 +++++++++++++++++++++++++++++++++++++-- arch/arm64/kernel/ftrace.c | 123 ++++++++++++++++++++-------------- arch/arm64/kernel/insn.c | 13 ++++ arch/arm64/kernel/module-plts.c | 3 +- arch/arm64/kernel/module.c | 57 +++++++++++++--- arch/parisc/Makefile | 1 - arch/parisc/kernel/module.c | 10 ++- arch/parisc/kernel/module.lds | 7 -- include/linux/ftrace.h | 5 ++ kernel/module.c | 2 +- kernel/trace/ftrace.c | 13 +++- 17 files changed, 330 insertions(+), 80 deletions(-) delete mode 100644 arch/parisc/kernel/module.lds
-- 2.11.0
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