Hello, Since we decided to remove jprobe from kernel last year, its APIs are disabled and we worked on moving in-kernel jprobe users to kprobes or trace-events. And now no jprobe users are here anymore. This is the 4th version of the series for removing jprobe. Previous version is here: https://lkml.org/lkml/2018/5/16/1052 Unlike previous versions, this version removes jprobe from all architectures, as Ingo asked me in the previous thread. I marked this as RFC again because it introduced changes for many arch. It should be reviewed by some arch which is not simply removing code (e.g. powerpc, arm). BTW, this series are based on -tip tree as same as its previous version, and I'm sure it can be applied to linus tree/linux-next too. Series structure ===== Basically this series introduces 3 major changes; - Remove jprobe implementation ([2/27] - [12/27]) - Remove break_handler() related code ([13/27] - [23/27]) This should be done after (or with) removing jprobe because break_handler is only used by jprobe. (I'm not so sure, should I merge above patches into one arch-wide patch as next one does?) - Clean current_kprobe and enable preempt if pre_handler() returns !0 ([24/27] and [25/27]<- x86 specific update) This also depends on above patches because those current_kprobe and preemption are expected to be adjusted by jprobe implementation via break_handler. And some minor changes; - Document cleanup and update ([1/27], [26/27]) And finally remove jprobe stub APIs and break_handler from kprobes.h ([27/27]). Of course this depends on above patches. Since removing jprobes and break_handler related code involve archtecture specific changes in some archs, I splitted it for each arch. But "clean current_kprobe and enable preempt if pre_handler() returns !0" patch modifies all architectures, since it changes expected kprobe handler behavior. I think this would be better done in one patch for consistency. Result ===== I've tested it with kprobe sanity test on x86-64, and arm64 but for other archs, I just did cross-build test. With this series, we finally cleanup all jprobe code and break_handler as below. $ git grep -wi break_handler | wc -l 0 $ git grep -wi jprobe | wc -l 0 Actually, there is one place where mentioning jprobe, Documentation/kprobes.txt explains jprobe is deprecated and how to migrate jprobe user to ftrace or kprobe. I didn't remove it because it might be useful for some users. Thank you, --- Masami Hiramatsu (27): Documentation/kprobes: Fix to remove remaining jprobe kprobes: Remove jprobe API implementation kprobes/x86: Remove jprobe implementation ARC: kprobes: Remove jprobe implementation ARM: kprobes: Remove jprobe arm implementation arm64: kprobes: Remove jprobe implementation powerpc/kprobes: Remove jprobe powerpc implementation ia64: kprobes: Remove jprobe implementation MIPS: kprobes: Remove jprobe implementation s390/kprobes: Remove jprobe implementation sh: kprobes: Remove jprobe implementation sparc64: kprobes: Remove jprobe implementation kprobes: Don't check the ->break_handler() in generic kprobes code kprobes/x86: Don't call ->break_handler() in x86 kprobes ARC: kprobes: Don't call the ->break_handler() in ARC kprobes code ARM: kprobes: Don't call the ->break_handler() in arm kprobes code arm64: kprobes: Don't call the ->break_handler() in arm kprobes code powerpc/kprobes: Don't call the ->break_handler() in arm kprobes code ia64: kprobes: Don't call the ->break_handler() in ia64 kprobes code MIPS: kprobes: Don't call the ->break_handler() in MIPS kprobes code s390/kprobes: Don't call the ->break_handler() in s390 kprobes code sh: kprobes: Don't call the ->break_handler() in SH kprobes code sparc64: kprobes: Don't call the ->break_handler() in sparc64 kprobes code bpf: error-inject: kprobes: Clear current_kprobe and enable preempt in kprobe x86: kprobes: Do not disable preempt on int3 path Documentation: kprobes: Add how to change the execution path kprobes: Remove jprobe stub API Documentation/kprobes.txt | 35 +++++- arch/arc/include/asm/kprobes.h | 2 arch/arc/kernel/kprobes.c | 50 +-------- arch/arm/include/asm/kprobes.h | 2 arch/arm/include/asm/probes.h | 1 arch/arm/probes/kprobes/core.c | 135 +----------------------- arch/arm64/include/asm/kprobes.h | 1 arch/arm64/kernel/probes/kprobes.c | 86 +-------------- arch/ia64/include/asm/kprobes.h | 2 arch/ia64/include/uapi/asm/break.h | 1 arch/ia64/kernel/Makefile | 2 arch/ia64/kernel/jprobes.S | 90 ---------------- arch/ia64/kernel/kprobes.c | 93 +---------------- arch/mips/include/asm/kprobes.h | 13 -- arch/mips/kernel/kprobes.c | 70 ++---------- arch/powerpc/include/asm/kprobes.h | 12 -- arch/powerpc/kernel/kprobes-ftrace.c | 31 +----- arch/powerpc/kernel/kprobes.c | 92 +++------------- arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 39 +------ arch/s390/include/asm/kprobes.h | 2 arch/s390/kernel/kprobes.c | 86 +-------------- arch/sh/include/asm/kprobes.h | 4 - arch/sh/kernel/kprobes.c | 72 +------------ arch/sparc/include/asm/kprobes.h | 1 arch/sparc/kernel/kprobes.c | 65 +----------- arch/x86/include/asm/kprobes.h | 5 - arch/x86/kernel/kprobes/common.h | 10 -- arch/x86/kernel/kprobes/core.c | 119 +-------------------- arch/x86/kernel/kprobes/ftrace.c | 31 ++---- arch/x86/kernel/kprobes/opt.c | 1 include/linux/kprobes.h | 53 --------- kernel/fail_function.c | 3 - kernel/kprobes.c | 115 +------------------- kernel/test_kprobes.c | 94 ----------------- kernel/trace/trace_kprobe.c | 11 +- lib/Kconfig.debug | 2 36 files changed, 125 insertions(+), 1306 deletions(-) delete mode 100644 arch/ia64/kernel/jprobes.S -- Masami Hiramatsu (Linaro)
