linux-kernel - Re: [PATCH v2 2/6] selftests: use canonical ftrace path

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Date:   Fri, 17 Feb 2023 21:10:11 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Ross Zwisler <zwisler@...omium.org>, <linux-kernel@...r.kernel.org>
CC:     Ross Zwisler <zwisler@...gle.com>, Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kselftest@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-trace-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v2 2/6] selftests: use canonical ftrace path



On 2/16/2023 4:03 AM, Ross Zwisler wrote:
> The canonical location for the tracefs filesystem is at /sys/kernel/tracing.
> 
> But, from Documentation/trace/ftrace.rst:
> 
>    Before 4.1, all ftrace tracing control files were within the debugfs
>    file system, which is typically located at /sys/kernel/debug/tracing.
>    For backward compatibility, when mounting the debugfs file system,
>    the tracefs file system will be automatically mounted at:
> 
>    /sys/kernel/debug/tracing
> 
> A few spots in tools/testing/selftests still refer to this older debugfs
> path, so let's update them to avoid confusion.
> 
> Signed-off-by: Ross Zwisler <zwisler@...gle.com>
> ---
>   tools/testing/selftests/user_events/dyn_test.c    |  2 +-
>   tools/testing/selftests/user_events/ftrace_test.c | 10 +++++-----
>   tools/testing/selftests/user_events/perf_test.c   |  8 ++++----
>   tools/testing/selftests/vm/protection_keys.c      |  4 ++--
>   4 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/testing/selftests/user_events/dyn_test.c b/tools/testing/selftests/user_events/dyn_test.c
> index d6265d14cd51..8879a7b04c6a 100644
> --- a/tools/testing/selftests/user_events/dyn_test.c
> +++ b/tools/testing/selftests/user_events/dyn_test.c
> @@ -16,7 +16,7 @@
>   
>   #include "../kselftest_harness.h"
>   
> -const char *dyn_file = "/sys/kernel/debug/tracing/dynamic_events";
> +const char *dyn_file = "/sys/kernel/tracing/dynamic_events";
>   const char *clear = "!u:__test_event";
>   
>   static int Append(const char *value)
> diff --git a/tools/testing/selftests/user_events/ftrace_test.c b/tools/testing/selftests/user_events/ftrace_test.c
> index 404a2713dcae..a0b2c96eb252 100644
> --- a/tools/testing/selftests/user_events/ftrace_test.c
> +++ b/tools/testing/selftests/user_events/ftrace_test.c
> @@ -16,11 +16,11 @@
>   
>   #include "../kselftest_harness.h"
>   
> -const char *data_file = "/sys/kernel/debug/tracing/user_events_data";
> -const char *status_file = "/sys/kernel/debug/tracing/user_events_status";
> -const char *enable_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/enable";
> -const char *trace_file = "/sys/kernel/debug/tracing/trace";
> -const char *fmt_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/format";
> +const char *data_file = "/sys/kernel/tracing/user_events_data";
> +const char *status_file = "/sys/kernel/tracing/user_events_status";
> +const char *enable_file = "/sys/kernel/tracing/events/user_events/__test_event/enable";
> +const char *trace_file = "/sys/kernel/tracing/trace";
> +const char *fmt_file = "/sys/kernel/tracing/events/user_events/__test_event/format";
>   
>   static inline int status_check(char *status_page, int status_bit)
>   {
> diff --git a/tools/testing/selftests/user_events/perf_test.c b/tools/testing/selftests/user_events/perf_test.c
> index 8b4c7879d5a7..31505642aa9b 100644
> --- a/tools/testing/selftests/user_events/perf_test.c
> +++ b/tools/testing/selftests/user_events/perf_test.c
> @@ -18,10 +18,10 @@
>   
>   #include "../kselftest_harness.h"
>   
> -const char *data_file = "/sys/kernel/debug/tracing/user_events_data";
> -const char *status_file = "/sys/kernel/debug/tracing/user_events_status";
> -const char *id_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/id";
> -const char *fmt_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/format";
> +const char *data_file = "/sys/kernel/tracing/user_events_data";
> +const char *status_file = "/sys/kernel/tracing/user_events_status";
> +const char *id_file = "/sys/kernel/tracing/events/user_events/__test_event/id";
> +const char *fmt_file = "/sys/kernel/tracing/events/user_events/__test_event/format";
>   
>   struct event {
>   	__u32 index;
> diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
> index 95f403a0c46d..0381c34fdd56 100644
> --- a/tools/testing/selftests/vm/protection_keys.c
> +++ b/tools/testing/selftests/vm/protection_keys.c
> @@ -98,7 +98,7 @@ int tracing_root_ok(void)
>   void tracing_on(void)
>   {
>   #if CONTROL_TRACING > 0
> -#define TRACEDIR "/sys/kernel/debug/tracing"
> +#define TRACEDIR "/sys/kernel/tracing"
>   	char pidstr[32];
>   
>   	if (!tracing_root_ok())
> @@ -124,7 +124,7 @@ void tracing_off(void)
>   #if CONTROL_TRACING > 0
>   	if (!tracing_root_ok())
>   		return;
> -	cat_into_file("0", "/sys/kernel/debug/tracing/tracing_on");
> +	cat_into_file("0", "/sys/kernel/tracing/tracing_on");
>   #endif
>   }
>   


Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>

-Mukesh