linux-kernel - Re: [PATCH] trace: Fix some checker warnings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221205121119.537fa922bbd8147b9df5ae6c@kernel.org>
Date:   Mon, 5 Dec 2022 12:11:19 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     kernel test robot <lkp@...el.com>,
        David Howells <dhowells@...hat.com>,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trace: Fix some checker warnings

On Sun, 4 Dec 2022 21:39:29 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 5 Dec 2022 11:22:36 +0900
> Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:
> 
> > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> > index 5cfc95a52bc3..14f18edfe5bc 100644
> > --- a/kernel/trace/trace.c
> > +++ b/kernel/trace/trace.c
> > @@ -6572,7 +6572,8 @@ tracing_thresh_write(struct file *filp, const char __user *ubuf,
> >  	return ret;
> >  }
> >  
> > -#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
> > +#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
> > +	|| defined(CONFIG_OSNOISE_TRACER)
> >  
> 
> When it gets this much, we need to put it into the trace.h header and
> define it. Actually, we have something that handles this too.
> 
> #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
>         || defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY)
> #define LATENCY_FS_NOTIFY
> #endif
> 
> 
> We can add:
> 
>  #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
> 	|| defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY)
>  #define LATENCY_FS_NOTIFY
> +#define USES_MAX_TRACE
>  #endif
> 
> And use that instead.

BTW, why can't HWLAT_TRACER and OSNOISE_TRACER depend on TRACER_MAX_TRACE?
I think it is better to reduce combinations of those, especially partially
enabling a feature seems a bit dangerous.

Thank you,

-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>