Re: [Qemu-devel] [PATCH] Avoid segfault in cpu_dump_state

[Fabien Chouteau <chouteau@adacore.com>]

On 05/15/2012 06:20 PM, Peter Maydell wrote:
> On 15 May 2012 17:08, Fabien Chouteau <chouteau@adacore.com> wrote:
>> On 05/15/2012 03:31 PM, Andreas Färber wrote:
>>> Am 15.05.2012 11:39, schrieb Fabien Chouteau:
>>>> Do not call cpu_dump_state if logfile is NULL.
>>>
>>> And where is log_cpu_state() being called from? Its caller is passing
>>> NULL already then.
> 
>> No, logfile is a global variable. log_cpu_state() takes only CPUState
>> and flags parameters.
> 
> The question is which of the following two options we want:
> (1) callers should be guarding the calls to log_cpu_state() with
> checks for qemu_log_enabled() or qemu_loglevel_mask()
> (2) log_cpu_state() does its own check for whether logging is enabled
> in the same way that qemu_log() and qemu_log_vprintf() do
> 
> At the moment most callers of log_cpu_state() do their own checks
> as per (1), but you could make an argument that we should switch
> to (2) instead.
> 

I think (2) is better, we do the check in one place and that's it. All
call to log_cpu_state are safe. And as you said, it's already the way
qemu_log and qemu_log_vprintf work.

-- 
Fabien Chouteau