[BUG] Linux 3.0 commit 3627924acf70a broke include/mtd/ubi_user.h.

[Rob Landley]

"make headers_install" copies include/mtd/ubi_user.h to userspace, where
things like busybox link against it.  With 3.0, building defconfig
busybox gets this error:

In file included from miscutils/ubi_tools.c:63:
/home/landley/aboriginal/aboriginal/build/simple-cross-compiler-i686/bin/../include/mtd/ubi-user.h:329:
error: conflicting types for '__packed'
/home/landley/aboriginal/aboriginal/build/simple-cross-compiler-i686/bin/../include/mtd/ubi-user.h:313:
error: previous declaration of '__packed' was here

This is due to the Linux 3.0 commit in the title:

    UBI: use __packed instead of __attribute__((packed))

This relies on __packed being defined in:

  include/linux/compiler-gcc.h:
  #define __packed			__attribute__((packed))

Which is not exported to userspace.

I.E. this "cleanup" broke the ability for userspace to use this header,
even though the header is exported to userspace by headers_install.

Rob
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