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    SubjectRe: [RFC] Introduce __ARCH_WANT_SYS_SYSFS
    On Tue, 22 Apr 2008 13:13:39 +0100 Will Newton wrote:

    > Hi,
    > This patch introduces a __ARCH_WANT_SYS_SYSFS #define for
    > architectures that support the sysfs(2) system call. At the moment
    > that's everybody but blackfin, but future architectures may want to
    > save the (admittedly small) code size that it adds to the kernel as
    > well.
    > (patch attached as well as inline because gmail seems to mangle my whitespace)
    > ---
    > >From d0746366e8ccb5fbaa6c9945540cecbe0c421222 Mon Sep 17 00:00:00 2001
    > From: Will Newton <>
    > Date: Tue, 22 Apr 2008 12:57:03 +0100
    > Subject: [PATCH] Introduce __ARCH_WANT_SYS_SYSFS.
    > Signed-off-by: Will Newton <>
    > All arches that want the sysfs(2) system call should define this symbol.
    > Arches such as blackfin that do not implement the system call don't compile
    > the code and save some small amount of space.

    Is there any reason that this couldn't (and shouldn't) be done
    in the Kconfig space and done as documented in
    Documentation/kbuild/kconfig-language.txt ?

    Adding common features and make the usage configurable
    It is a common idiom to implement a feature/functionality that are
    relevant for some architectures but not all.
    The recommended way to do so is to use a config variable named HAVE_*
    that is defined in a common Kconfig file and selected by the relevant
    An example is the generic IOMAP functionality.

    We would in lib/Kconfig see:

    # Generic IOMAP is used to ...

    config GENERIC_IOMAP
    depends on HAVE_GENERIC_IOMAP && FOO

    And in lib/Makefile we would see:
    obj-$(CONFIG_GENERIC_IOMAP) += iomap.o

    For each architecture using the generic IOMAP functionality we would see:

    config X86
    select ...
    select ...


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