[CRIU] [PATCH 4/4] prctl: restore -- Use new PR_SET_MM_MAP if kernel supports

[Pavel Emelyanov]

On 10/23/2014 05:58 PM, Cyrill Gorcunov wrote:
> On Thu, Oct 23, 2014 at 05:43:20PM +0400, Pavel Emelyanov wrote:
>>
>> I don't understand the need in args->prctl_may_use_mm_map. Why not just
>>
>> ret = prctl(PR_SET_MM< PR_SET_MM_MAP, ...);
>> if (ret == -EINVAL) {
>> 	ret = <old code>
>> }
> 
> Same eggs, side view. Look, we need to choose which version to call,
> thus we choose proper version in kernel-dat, and reuse it for "check"
> and restore.

We don't actually need to check this in kerndat. There's no
point in making one more syscall to check whether it works
or not.