linux-kernel - Re: [PATCH] trace-cmd: Fix reporting of unknown SVM exit reasons

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Date:	Wed, 1 Jun 2016 12:06:40 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH] trace-cmd: Fix reporting of unknown SVM exit reasons

On 2016-05-31 17:23, Steven Rostedt wrote:
> On Sun, 22 May 2016 18:02:31 +0200
> Jan Kiszka <jan.kiszka@....de> wrote:
> 
> Hi Jan,
> 
> I finally got around to looking at your patches (not much to do on a 12
> hour layover :-p).
> 
>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>
>> On AMD, exist code -1 is also a possible value, but we use it for
>> terminating the list of known exit reasons. This leads to EXIT_ERR
>> being reported for unkown ones. Fix this by using an NULL string
>> pointer as terminal.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
>> ---
>>  plugin_kvm.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/plugin_kvm.c b/plugin_kvm.c
>> index 15a6f4c..99e920f 100644
>> --- a/plugin_kvm.c
>> +++ b/plugin_kvm.c
>> @@ -208,12 +208,12 @@ struct str_values {
>>  
>>  static struct str_values vmx_exit_reasons[] = {
>>  	VMX_EXIT_REASONS
>> -	{ NULL, -1}
>> +	{ }
> 
> Just a preference, but I would rather this still explicitly show the
> NULL. The second value is meaningless with the change below. Thus, I'm
> going to nuke these two hunks and just add the last one, which should
> still work for you.

Fine for me.

Thanks,
Jan

> 
> If not, let me know, or just tell me this weekend ;-) (I wont be
> pushing this to my main server till I get back anyway)
> 
> -- Steve
> 
>>  };
>>  
>>  static struct str_values svm_exit_reasons[] = {
>>  	SVM_EXIT_REASONS
>> -	{ NULL, -1}
>> +	{ }
>>  };
>>  
>>  static struct isa_exit_reasons {
>> @@ -237,7 +237,7 @@ static const char *find_exit_reason(unsigned isa, int val)
>>  		}
>>  	if (!strings)
>>  		return "UNKNOWN-ISA";
>> -	for (i = 0; strings[i].val >= 0; i++)
>> +	for (i = 0; strings[i].str; i++)
>>  		if (strings[i].val == val)
>>  			break;
>>  
>