Re: IA64/simulators - Kconfig logic for drivers/*

From: David Mosberger (davidm_at_napali.hpl.hp.com)
Date: 11/03/03

  • Next message: David Mosberger: "Re: virt_to_page/pci_map_page vs. pci_map_single" 
    Date:	Mon, 3 Nov 2003 13:55:22 -0800
To: "Noah J. Misch" <noah@caltech.edu>

    >>>>> On Sat, 1 Nov 2003 22:41:07 -0800 (PST), "Noah J. Misch" <noah@caltech.edu> said:

      Noah> On Sun, 2 Nov 2003, Matthew Wilcox wrote:
    >> > Why not include drivers/Kconfig and scrap the individual subdirectory
    >> > includes, as i386 does?

    >> At that time, I hadn't done the work to create drivers/Kconfig ;-)
    >> The main problem for ia64 is the simulator stuff. Maybe something like:

    >> if !IA64_HP_SIM
    >> source "drivers/Kconfig"
    >> endif

    >> if IA64_HP_SIM
    >> source "drivers/base/Kconfig"
    >> source "drivers/scsi/Kconfig"
    >> source "net/Kconfig"
    >> source "drivers/block/Kconfig"
    >> source "arch/ia64/hp/sim/Kconfig"
    >> endif

      Noah> I would guess that everyone who uses a simulator is a kernel
      Noah> developer or maybe an application developer. I worry that the
      Noah> risk of hiding useful configs from simulator users by lax
      Noah> maintenance of that block of Kconfig logic exceeds the risk of
      Noah> those people trying to build a simulator kernel with all kinds
      Noah> of hardware drivers and finding that it doesn't work. A
      Noah> quieter configuration is nice, however. Hmmm.

    I suspect it should be possible to do this much cleaner with the new
    Kconfig system. For example, if all PCI-dependent drivers really do
    specify "depends on PCI" (or something equivalent), then a good
    portion of the hopeless drivers would automagically go away from the
    simulator configuration. What's there now "works", but it clearly
    could stand some modernization.

            --david
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