Re: [PATCH 07/12] perf kvm: handle realloc failures

[Arnaldo Carvalho de Melo <acme@ghostprotocols.net>]

Em Mon, Oct 08, 2012 at 02:34:55PM -0600, David Ahern escreveu:
> On 10/8/12 2:19 PM, Arnaldo Carvalho de Melo wrote:
> >>+	prev = event->vcpu;
> >>  	event->vcpu = realloc(event->vcpu,
> >>  			      event->max_vcpu * sizeof(*event->vcpu));
> >>  	if (!event->vcpu) {
> >>+		free(prev);
> >>  		pr_err("Not enough memory\n");

> >Unfamiliar way of doing it, usually we do it like:

> >   	vcpu = realloc(event->vcpu, event->max_vcpu * sizeof(*event->vcpu));

> >	if (!vcpu) {
> >   		pr_err("Not enough memory\n");
> >		return -1;
> >	}

> >	event->vcpu = vcpu;

> >I.e. we don't trow away the old value of event->vcpu.
> 
> right. Command is going to exit on a failure, so leaving the old
> value does not have any impact. I can leave the old if you want it
> for consistency.

I think do it in the familiar way for consistency.

- Arnaldo