Re: [PATCH v2] um: Allow building and running on older hosts

[Richard Weinberger]

Thomas, Florian,

Am 26.05.2017 um 00:28 schrieb Florian Fainelli:
> On 05/25/2017 12:51 PM, Thomas Meyer wrote:
>>
>>> Am 25.05.2017 um 20:36 schrieb Florian Fainelli <f.fainelli@xxxxxxxxx>:
>>>
>>> Commit a78ff1112263 ("um: add extended processor state save/restore
>>> support") and b6024b21fec8 ("um: extend fpstate to _xstate to support
>>> YMM registers") forced the use of the x86 FP _xstate and
>>> PTRACE_GETREGSET/SETREGSET. On older hosts, we would neither be able to
>>> build UML nor run it anymore with these two commits applied because we
>>> don't have definitions for struct _xstate nor these two ptrace requests.
>>
>> Btw. what soy you mean with older host? I need to revert two commits to make an UML kernel work again on a Fedora 25 installation.
> 
> This is centos 6.9, so kernel 2.6.32 and glibc 2.12, this neither has
> xstate nor PTRACE_GETREGSET/SETREGSET, hence this patch.

Commits a78ff1112263 and b6024b21fec8 are broken.
You see two different issues.
Eli, please have a look too.

Thanks,
//richard