linux-kernel - Re: [PATCH -mm 2/5] cn_proc: replaced old hard-coded 16 with TASK_COMM_LEN

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Date:   Wed, 8 Dec 2021 13:40:45 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     akpm@...ux-foundation.org, keescook@...omium.org, pmladek@...e.com,
        david@...hat.com, arnaldo.melo@...il.com,
        andrii.nakryiko@...il.com, linux-mm@...ck.org, bpf@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Michal Miroslaw <mirq-linux@...e.qmqm.pl>,
        Peter Zijlstra <peterz@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH -mm 2/5] cn_proc: replaced old hard-coded 16 with
 TASK_COMM_LEN_16

On Sat,  4 Dec 2021 09:52:53 +0000
Yafang Shao <laoar.shao@...il.com> wrote:

> This TASK_COMM_LEN_16 has the same meaning with the macro defined in
> linux/sched.h, but we can't include linux/sched.h in a UAPI header, so
> we should specifically define it in the cn_proc.h.
> 

Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

> Signed-off-by: Yafang Shao <laoar.shao@...il.com>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
> Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>
> Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
> Cc: Michal Miroslaw <mirq-linux@...e.qmqm.pl>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Petr Mladek <pmladek@...e.com>
> ---
>  include/uapi/linux/cn_proc.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/cn_proc.h b/include/uapi/linux/cn_proc.h
> index db210625cee8..6dcccaed383f 100644
> --- a/include/uapi/linux/cn_proc.h
> +++ b/include/uapi/linux/cn_proc.h
> @@ -21,6 +21,8 @@
>  
>  #include <linux/types.h>
>  
> +#define TASK_COMM_LEN_16 16
> +
>  /*
>   * Userspace sends this enum to register with the kernel that it is listening
>   * for events on the connector.
> @@ -110,7 +112,7 @@ struct proc_event {
>  		struct comm_proc_event {
>  			__kernel_pid_t process_pid;
>  			__kernel_pid_t process_tgid;
> -			char           comm[16];
> +			char           comm[TASK_COMM_LEN_16];
>  		} comm;
>  
>  		struct coredump_proc_event {