Date: Fri, 17 Feb 2017 12:56:44 -0700 From: Warner Losh <imp@bsdimp.com> To: Sean Bruno <sbruno@freebsd.org> Cc: John Baldwin <jhb@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: Thinning out GENERIC Message-ID: <CANCZdfrWycNbmmwmjacHf5KJxnRHoLeZW1s%2B1F1XWfHyWxtn_w@mail.gmail.com> In-Reply-To: <ff6d9a9d-36f2-459f-78c5-a7269c2caae9@freebsd.org> References: <34e4e9bd-c7a8-e3e2-4cef-98a691ea7944@freebsd.org> <2553875.ilSvFZYQZ6@ralph.baldwin.cx> <bf4931ec-2c05-2b90-8bc6-affac684bd23@freebsd.org> <1907688.dXvDEfTesD@ralph.baldwin.cx> <ff6d9a9d-36f2-459f-78c5-a7269c2caae9@freebsd.org>
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On Fri, Feb 17, 2017 at 12:54 PM, Sean Bruno <sbruno@freebsd.org> wrote: > > > On 02/17/17 12:49, John Baldwin wrote: >> On Friday, February 17, 2017 11:43:45 AM Sean Bruno wrote: >>> >>> On 02/13/17 11:33, John Baldwin wrote: >>>> On Monday, February 13, 2017 10:51:36 AM Warner Losh wrote: >>>>> [[ It isn't just GENERIC, it's in every single kernel ]] >>>>> >>>>> On Sun, Feb 12, 2017 at 7:59 AM, Sean Bruno <sbruno@freebsd.org> wrote: >>>>>> Index: sys/conf/files >>>>>> =================================================================== >>>>>> --- sys/conf/files (revision 313683) >>>>>> +++ sys/conf/files (working copy) >>>>>> @@ -2419,7 +2419,7 @@ >>>>>> dev/pci/pci_user.c optional pci >>>>>> dev/pci/pcib_if.m standard >>>>>> dev/pci/pcib_support.c standard >>>>>> -dev/pci/vga_pci.c optional pci >>>>>> +#dev/pci/vga_pci.c optional pci >>>>>> dev/pcn/if_pcn.c optional pcn pci >>>>>> dev/pdq/if_fea.c optional fea eisa >>>>>> dev/pdq/if_fpa.c optional fpa pci >>>>>> >>>>>> I'm playing around with small x86 builds and wanted to come up with a >>>>>> knob that disables the vga_pci driver. Obviously I still want pci(4) to >>>>>> be enabled, but I definitely do not need the vga interfaces for >>>>>> anything. Any suggestions? >>>>> >>>>> You could make it dependent on vt or sc as well as pci, no? >>>> >>>> This is a fairly small driver: >>>> >>>> 6139 340 8 6487 0x1957 /usr/obj/usr/src/sys/GENERIC >>>> /vga_pci.o >>>> >>>> (From an 11.0-stable build) >>>> >>>> device ppc and friends is a lot more for example: >>>> >>>> text data bss dec hex filename >>>> 6238 0 0 6238 0x185e /usr/obj/usr/src/sys/GENERIC/ppb_1284.o >>>> 1675 28 0 1703 0x6a7 /usr/obj/usr/src/sys/GENERIC/ppb_base.o >>>> 2042 0 0 2042 0x7fa /usr/obj/usr/src/sys/GENERIC/ppb_msq.o >>>> 6025 296 8 6329 0x18b9 /usr/obj/usr/src/sys/GENERIC/ppbconf.o >>>> 0 168 0 168 0xa8 /usr/obj/usr/src/sys/GENERIC/ppbus_if.o >>>> 9099 36 0 9135 0x23af /usr/obj/usr/src/sys/GENERIC/ppc.o >>>> 495 256 0 751 0x2ef /usr/obj/usr/src/sys/GENERIC/ppc_acpi.o >>>> 1671 256 0 1927 0x787 /usr/obj/usr/src/sys/GENERIC/ppc_isa.o >>>> 1124 208 0 1332 0x534 /usr/obj/usr/src/sys/GENERIC/ppc_pci.o >>>> 451 208 0 659 0x293 /usr/obj/usr/src/sys/GENERIC/ppc_puc.o >>>> 2751 428 8 3187 0xc73 /usr/obj/usr/src/sys/GENERIC/ppi.o >>>> >>>> It is needed for drm. >>>> >>> >>> Ok, so ... make it dependant on drm, vt, sc and pci? >> >> You can kldload drm at runtime, so a static dependency isn't sufficient. >> It's not clear why removing this from GENERIC is that important. ppc is on far >> fewer machines than vga_pci and takes up 10x more space. >> > > I don't want to remove it from GENERIC. I want to add the capability to > remove it. Sorry if that wasn't clear from my subject line, because it > doesn't look clear now that I re-read it. He likely wants to remove a lot of other things too. He's not asking about those because the are already easy to remove :) You'd want to make it a module, then have drm depend on the module as well as the static dependencies you outlines. And yes, this does highlight some issues with our current build system... Warnerhome | help
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