Guo Ren 829adda597 riscv: Add KPROBES_ON_FTRACE supported ... This patch adds support for kprobes on ftrace call sites to avoids much of the overhead with regular kprobes. Try it with simple steps: echo 'p:myprobe sys_clone a0=%a0 a1=%a1 stack_val=+4($stack)' > /sys/kernel/de bug/tracing/kprobe_events echo 1 > /sys/kernel/debug/tracing/events/kprobes/enable cat /sys/kernel/debug/tracing/trace tracer: nop entries-in-buffer/entries-written: 1/1 #P:1 _-----=> irqs-off / _----=> need-resched | / _---=> hardirq/softirq || / _--=> preempt-depth ||| / delay TASK-PID CPU# |||| TIMESTAMP FUNCTION | | | |||| | | sh-92 [000] .... 369.899962: myprobe: (sys_clone+0x0/0x28) a0=0x1200011 a1=0x0 stack_val=0x201c20ffffffe0 cat /sys/kernel/debug/kprobes/list ffffffe00020b584 k sys_clone+0x0 [FTRACE] ^^^^^^ Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2021-01-14 15:09:07 -08:00
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boot	riscv: Fix Canaan Kendryte K210 device tree	2021-01-14 15:08:47 -08:00
configs	riscv: Use vendor name for K210 SoC support	2021-01-14 15:08:46 -08:00
include	riscv: Add kprobes supported	2021-01-14 15:09:06 -08:00
kernel	riscv: Add KPROBES_ON_FTRACE supported	2021-01-14 15:09:07 -08:00
lib	riscv: provide memmove implementation	2020-12-10 17:27:54 -08:00
mm	riscv: Add kprobes supported	2021-01-14 15:09:06 -08:00
net	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	riscv: Add KPROBES_ON_FTRACE supported	2021-01-14 15:09:07 -08:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.socs	riscv: Add Canaan Kendryte K210 reset controller	2021-01-14 15:08:53 -08:00
Makefile	riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT	2021-01-14 15:09:05 -08:00