linux-kernel - Re: [PATCH] Add ability to override kernel release check

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Message-ID: <57ED1406.80204@kyup.com>
Date:   Thu, 29 Sep 2016 16:15:50 +0300
From:   Nikolay Borisov <kernel@...p.com>
To:     herton@...hat.com, fabf@...net.be
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] Add ability to override kernel release check



On 09/29/2016 04:14 PM, Nikolay Borisov wrote:
> From: Nikolay Borisov <n.borisov@...eground.com>
> 
> In some situation it might be useful to disable checking the
> kernel release. This happens when a kernel module is being rebuilt
> and then probed. Without this override one has to reboot the machine
> with the new kernel (and module) and then use systemtap.
> 
> To rectify the situation add a new define STP_NO_VERREL_CHECK,
> which disables the relevant code in the resulting systemtap module.
> 
> This can be used with the following syntax: 
> stap -DSTP_NO_VERREL_CHECK script.stp
> 
> Signed-off-by: Nikolay Borisov <n.borisov@...eground.com>
> ---
>  translate.cxx | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/translate.cxx b/translate.cxx
> index 489bd2e2de1a..f792343e0cae 100644
> --- a/translate.cxx
> +++ b/translate.cxx
> @@ -1728,6 +1728,7 @@ c_unparser::emit_module_init ()
>        // run a probe compiled for a different version.  Catch this early,
>        // just in case modversions didn't.
>        o->newline() << "{";
> +      o->newline() << "#ifndef STP_NO_VERREL_CHECK";
>        o->newline(1) << "const char* release = UTS_RELEASE;";
>        o->newline() << "#ifdef STAPCONF_GENERATED_COMPILE";
>        o->newline() << "const char* version = UTS_VERSION;";
> @@ -1762,6 +1763,7 @@ c_unparser::emit_module_init ()
>        o->newline() << "rc = -EINVAL;";
>        o->newline(-1) << "}";
>        o->newline() << "#endif";
> +      o->newline() << "#endif";
>  
>        // perform buildid-based checking if able
>        o->newline() << "if (_stp_module_check()) rc = -EINVAL;";
> 

Please ignore, that was clearly an error... silly me :(