linux-kernel - Re: [RFC PATCH] Trace: use unsigned long long in trace print frames

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Date:	Sat, 02 Apr 2011 09:41:35 +0800
From:	liubo <liubo2009@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Linux Btrfs <linux-btrfs@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [RFC PATCH] Trace: use unsigned long long in trace print frames

On 04/01/2011 09:49 PM, Steven Rostedt wrote:
> On Fri, 2011-04-01 at 14:42 +0800, liubo wrote:
>> While adding tracepoint for btrfs, I got a problem:
>>
>> btrfs uses some macros with "ULL" type, but tracepoint's macros,
>> __print_[flags,symbols](), only have "unsigned long", so on 32bit box
>> there will be 64->32 truncate WARNINGs when compiling.
>>
>> Here I'm inclined to make the replacement to clear those WARNINGs.
> 
> Hmm, I don't like this. unsigned long is a natural word for
> architectures, I don't want to have 32 bit suffer because one user is
> doing something with ULL.
> 
> A better solution is to add a trace_print_flags_u64 or something, that
> can be used for cases that u64 is needed. For archs were sizeof(long) ==
> sizeof(u64) we can have the two macros/structs be the same.
> 

All right, a u64 specific one is also in my mind. :)

thanks,
liubo

> -- Steve
> 
> 
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