[ewg] Question about CONFIG_COMPAT_RHEL_6_4

[Shuichi Ihara]

Thanks, Vladimir!

This makes sense to me. 
So, today we (will) have CONFIG_COMPAT_RHEL_6_{3,4} and CONFIG_COMPAT_SLES_11_2 macros in OFED-3.5.x?
I'm also looking forward to see your dynamic construction changes!

Thanks again..

Ihara

On May 27, 2013, at 10:36 PM, Vladimir Sokolovsky <vlad at dev.mellanox.co.il> wrote:

> 
> ----- Original Message -----
>> From: "Shuichi Ihara" <sihara at ddn.com>
>> To: ewg at lists.openfabrics.org
>> Sent: Monday, May 27, 2013 2:47:49 PM
>> Subject: [ewg] Question about CONFIG_COMPAT_RHEL_6_4
>> 
>> 
>> Hi,
>> 
>> I'm testing lustre with OFED-3.5.1 against RHEL6.4 kernel.
>> There are a lot of duplicated functions and macro name in the compat
>> headers that there are already defined in RHEL6.4's kernel as their
>> own backport.
>> However, this is fine. In order to ignore them, I see there is
>> special macro CONFIG_COMPAT_RHEL_6_4.
>> Thanks for this superset for RHEL6.4 kernel!
>> 
>> I have succeeded Lustre build with "-DCONFIG_COMPAT_RHEL_6_4".
>> 
>> However, in general (not only lustre, but also building kernel module
>> with OFED-3.x against RHEL kernel) I'm wondering what is proper
>> process if we want to build with OFED and RHEL kernel.
>> 
>> And, here is my additional questions...
>> 
>> 1. OFED-3.x is NO auto detection kernel version and set superset
>> macro (like CONFIG_COMPAT_RHEL_6_4) in OFED itself?
>> Does user have to make sure kernel version and set
>> -DCONFIG_COMPAT_RHEL_6_4 to build?
> 
> Currently, in OFED-3.5*, this is the only way to compile kernel module with OFED.
> I plan to add dynamic construction of the compat.mk by parsing kernel headers to avoid using "CONFIG_COMPAT_RHEL_6_4" like macros.
> 
>> 
>> 2. What happen if new new distribution update release out? We will
>> see CONFIG_COMPAT_RHEL_6_{5,6}??
> 
> It depends if I will accomplish dynamic construction of the compat.mk by then.
> 
>> 
>> 3. How about other distribution case? Any development documentation
>> available for OFED-3.x?
>> 
> 
>> Thanks
>> Ihara
>> 
> 
> For other distributions need to define the corresponding macro or create a set of CFLAGS that will fit the kernel API.
> Currently, there is no relevant documentation available. I hope it will be ready by the next OFED release.
> 
> Regards,
> Vladimir