On Mon, Nov 11, 2024 at 12:51:09AM +0900, Masami Hiramatsu (Google) wrote: > From: Masami Hiramatsu (Google) <[email protected]> > > Rewrite fprobe implementation on function-graph tracer. > Major API changes are: > - 'nr_maxactive' field is deprecated. > - This depends on CONFIG_DYNAMIC_FTRACE_WITH_ARGS or > !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS, and > CONFIG_HAVE_FUNCTION_GRAPH_FREGS. So currently works only > on x86_64. > - Currently the entry size is limited in 15 * sizeof(long). > - If there is too many fprobe exit handler set on the same > function, it will fail to probe. > > Signed-off-by: Masami Hiramatsu (Google) <[email protected]> > --- > arch/arm64/include/asm/ftrace.h | 6 > arch/loongarch/include/asm/ftrace.h | 6 > arch/powerpc/include/asm/ftrace.h | 6 > arch/riscv/include/asm/ftrace.h | 5 > arch/s390/include/asm/ftrace.h | 6 > arch/x86/include/asm/ftrace.h | 6 > include/linux/fprobe.h | 58 ++- > kernel/trace/Kconfig | 10 - > kernel/trace/fprobe.c | 637 > +++++++++++++++++++++++++---------- > lib/test_fprobe.c | 45 -- > 10 files changed, 539 insertions(+), 246 deletions(-) ... > diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h > index fd3f0fe9f7b3..a3b73a4f626e 100644 > --- a/arch/s390/include/asm/ftrace.h > +++ b/arch/s390/include/asm/ftrace.h > @@ -77,6 +77,12 @@ ftrace_regs_get_frame_pointer(struct ftrace_regs *fregs) > return ftrace_regs_get_stack_pointer(fregs); > } > > +static __always_inline unsigned long > +ftrace_regs_get_return_address(const struct ftrace_regs *fregs) > +{ > + return arch_ftrace_regs(fregs)->regs.gprs[14]; > +} > +
Acked-by: Heiko Carstens <[email protected]> # s390
