svn commit: r277204 - head/sys/amd64/conf

[Warner Losh]

> On Jan 16, 2015, at 11:43 AM, Adrian Chadd <adrian at freebsd.org> wrote:
> 
> On 16 January 2015 at 09:57, Warner Losh <imp at bsdimp.com> wrote:
>> 
>>> On Jan 15, 2015, at 6:23 AM, Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
>>> 
>>> On Thu, Jan 15, 2015 at 12:42:07AM +0000, Warner Losh wrote:
>>> 
>>>> Author: imp
>>>> Date: Thu Jan 15 00:42:06 2015
>>>> New Revision: 277204
>>>> URL: https://svnweb.freebsd.org/changeset/base/277204
>>>> 
>>>> Log:
>>>> New MINIMAL kernel config. The goal with this configuration is to
>>>> only compile in those options in GENERIC that cannot be loaded as
>>>> modules. ufs is still included because many of its options aren't
>>>> present in the kernel module. There's some other exceptions documented
>>> 
>>> Are you sure?
>>> I think defining UFS options in kernel connfig affect to module too.
>>> When I define this options in kernel config (w/o options FFS) I got
>>> ufs.ko with this SU, quota, acl etc.
>> 
>> While one could set options in the kernel to affect the ufs.ko build,
>> there’s not a universal ufs.ko that can be loaded easily that switches
>> between the different types of options. You can create modules
>> that do this, but that’s a very very different problem than the one I
>> want to solve, namely you get the same[*] functionality having
>> device fred in the kernel config as kldloading fred.ko. So rather than
>> bite off that problem also, I’m opting for simplicity.
>> 
>>>> +options     SOFTUPDATES             # Enable FFS soft updates support
>>>> +options     UFS_ACL                 # Support for access control lists
>>>> +options     UFS_DIRHASH             # Improve performance on big directories
>>>> +options     UFS_GJOURNAL            # Enable gjournal-based UFS journaling
>>>> +options     QUOTA                   # Enable disk quotas for UFS
>>> 
>>>> +options     SYSVSHM                 # SYSV-style shared memory
>>>> +options     SYSVMSG                 # SYSV-style message queues
>>>> +options     SYSVSEM                 # SYSV-style semaphores
>>>> +device              agp                     # support several AGP chipsets
>>>> +device              random                  # Entropy device
>>>> +device              padlock_rng             # VIA Padlock RNG
>>>> +device              rdrand_rng              # Intel Bull Mountain RNG
>>>> +device              vlan                    # 802.1Q VLAN support
>>>> +device              tun                     # Packet tunnel.
>>>> +device              gif                     # IPv6 and IPv4 tunneling
>>> 
>>> This is loadable too.
>> 
>> True
>> 
>>> And please include:
>>> 
>>> NETMAP
>>> NFS_ROOT
>> 
>> OK.
>> 
>>> IEEE80211_DEBUG
>>> IEEE80211_AMPDU_AGE
>>> IEEE80211_SUPPORT_MESH
>>> AH_SUPPORT_AR5416
>>> AH_AR5416_INTERRUPT_MITIGATION
>>> ATH_ENABLE_11N
>> 
>> These are already the default for the ath or wlan modules, if I’m reading things correctly.
> 
> Nope.

It’s simple to add any of the last 3 to modules/ath, but I see your point.

> The other half of this problem is where some modules (did? do?)
> populate an opt_wlan.h with their own options. Some modules did this
> with the inet option.

You might thing that, but you’d be behind the times. The IEEE options
are centralized, as are the INET options.

> When I've done what you're doing, I end up having these options in my
> minimal config file so opt_xxx.h is correctly populated. That way when
> I point SYSDIR (or whichever variable it is) at the configured kernel
> directory with the opt_xxx.h files, it all works out correctly.

Yea, that’s a different issue.

> (I still think we shouldn't be relying on "defaults", but should ship
> the opt_xxx.h files or something to derive the opt_xxx.h and makefile
> config bits so things like external module building is possible
> against a kernel. Or, we just kill all module options that change
> behaviour/ABI of things in an incompatible way.)

Options aren’t supposed to change KBI. Some do, and that’s unfortunate.

But don’t turn this into a rant on how sub-optimal the opt_XXXX.h
intersect with modules. That’s another set of problems to solve.

Warner
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