Re: [PATCH v19 12/19] fprobe: Rewrite fprobe on function-graph tracer
From: Heiko Carstens <hca@linux.ibm.com>
Date: 2024-11-10 17:07:56
Also in:
bpf, linux-arch, lkml
On Mon, Nov 11, 2024 at 12:51:09AM +0900, Masami Hiramatsu (Google) wrote:
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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) <mhiramat@kernel.org>
---
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(-)...
quoted hunk ↗ jump to hunk
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 <hca@linux.ibm.com> # s390