[PATCH] riscv: fix trace_sys_exit hook

[PATCH] riscv: fix trace_sys_exit hook

[David Abdurachmanov]

Depends on:
http://lists.infradead.org/pipermail/linux-riscv/2018-October/001931.html

Why we don't have HAVE_SYSCALL_TRACEPOINTS in arch/riscv/Kconfig?

Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>
---
 arch/riscv/kernel/ptrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c
index 9f82a7e34c64..9db7d0076375 100644
--- a/arch/riscv/kernel/ptrace.c
+++ b/arch/riscv/kernel/ptrace.c
@@ -120,6 +120,6 @@ void do_syscall_trace_exit(struct pt_regs *regs)
 
 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
 	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
-		trace_sys_exit(regs, regs->regs[0]);
+		trace_sys_exit(regs, regs_return_value(regs));
 #endif
 }
-- 
2.17.2

Re: [PATCH] riscv: fix trace_sys_exit hook

[David Abdurachmanov]

On Mon, Oct 29, 2018 at 1:15 PM David Abdurachmanov
<david.abdurachmanov@gmail.com> wrote:
>
> Depends on:
> http://lists.infradead.org/pipermail/linux-riscv/2018-October/001931.html
>
> Why we don't have HAVE_SYSCALL_TRACEPOINTS in arch/riscv/Kconfig?
>

I looked this morning into Documentation/trace/ftrace-design.rst again.

Of all the things the document describes we are only missing
HAVE_SYSCALL_TRACEPOINTS in Kconfig, yet we already have it
implemented in ptrace.c (+ this minor fix). Reading document, I think,
we check all the boxes needed for HAVE_SYSCALL_TRACEPOINTS.

I assume it was just missed (?) and will do v2 later on.

david

Re: [PATCH] riscv: fix trace_sys_exit hook

[Palmer Dabbelt]

On Mon, 29 Oct 2018 05:15:16 PDT (-0700), david.abdurachmanov@gmail.com wrote:
> Depends on:
> http://lists.infradead.org/pipermail/linux-riscv/2018-October/001931.html
>
> Why we don't have HAVE_SYSCALL_TRACEPOINTS in arch/riscv/Kconfig?
>
> Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>
> ---
>  arch/riscv/kernel/ptrace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c
> index 9f82a7e34c64..9db7d0076375 100644
> --- a/arch/riscv/kernel/ptrace.c
> +++ b/arch/riscv/kernel/ptrace.c
> @@ -120,6 +120,6 @@ void do_syscall_trace_exit(struct pt_regs *regs)
>
>  #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
>  	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
> -		trace_sys_exit(regs, regs->regs[0]);
> +		trace_sys_exit(regs, regs_return_value(regs));
>  #endif
>  }

I'm dropping this onto next-audit on top of the other two.

Thanks!