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    SubjectRe: Why did oldconfig's behavior change in 2.6.15-rc1?
    On Sat, Nov 12, 2005 at 05:31:25PM -0600, Rob Landley wrote:
    > On Saturday 12 November 2005 16:56, Rob Landley wrote:
    > > Linus says if we're going to test something, test -rc1, so I did.
    > >
    > > It went boing.
    > >
    > > I'm still trying to get -skas0 working on x86-64, but this was a standard
    > > x86 build...
    > >
    > > Rob
    >
    > Very, very strange:
    >
    > > make ARCH=um allnoconfig
    > > cat >> .config << EOF
    > CONFIG_MODE_SKAS=y
    > CONFIG_BINFMT_ELF=y
    > CONFIG_HOSTFS=y
    > CONFIG_SYSCTL=y
    > CONFIG_STDERR_CONSOLE=y
    > CONFIG_UNIX98_PTYS=y
    > CONFIG_BLK_DEV_LOOP=y
    > CONFIG_BLK_DEV_UBD=y
    > CONFIG_TMPFS=y
    > CONFIG_SWAP=y
    > CONFIG_LBD=y
    > CONFIG_EXT2_FS=y
    > CONFIG_PROC_FS=y
    > EOF
    > > make ARCH=um oldconfig
    > > grep SKAS .config
    > # CONFIG_MODE_SKAS is not set
    >
    > Why did oldconfig switch off CONFIG_MODE_SKAS? It didn't do that before.
    > Hmmm... Rummage, rummage... Darn it, it's position dependent. _And_
    > version dependent.
    >
    > Ok, now I have to put the new entries at the _beginning_. Appending them
    > doesn't work anymore, it now ignores any symbol it's already seen, so you
    > can't easily start with allnoconfig, switch on just what you want, and expect
    > oldconfig to do anything intelligent.
    >
    > That kinda sucks. Oh well, I can have sed rip out the old symbols before I
    > append the new ones. Here's hoping it's not _that_ position dependent...

    A much better way would be to put the values in a file named:
    allno.config

    With latest kconfig changes this will do the trick, and you will have a
    valid config no matter what you put in.

    Sam
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