On Thu, Oct 24, 2013 at 10:41 AM, Josh Triplett <josh@xxxxxxxxxxxxxxxx> wrote: > Discussion at Kernel Summit made it clear that the presence or absence > of specific Kconfig symbols are not considered ABI, and that no > userspace (or bootloader, etc) should rely on them. > > In addition, kernel-internal symbols are well established as non-ABI, > per Documentation/stable_api_nonsense.txt. > > Document both of these in Documentation/ABI/README, in a new section for > notable bits of non-ABI. > > Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx> > --- > Documentation/ABI/README | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/Documentation/ABI/README b/Documentation/ABI/README > index 1006982..1fafc4b 100644 > --- a/Documentation/ABI/README > +++ b/Documentation/ABI/README > @@ -72,3 +72,16 @@ kernel tree without going through the obsolete state first. > > It's up to the developer to place their interfaces in the category they > wish for it to start out in. > + > + > +Notable bits of non-ABI, which should not under any circumstances be considered > +stable: > + > +- Kconfig. Userspace should not rely on the presence or absence of any > + particular Kconfig symbol, in /proc/config.gz, in the copy of .config > + commonly installed to /boot, or in any invocation of the kernel build > + process. > + > +- Kernel-internal symbols. Do not rely on the presence, absence, location, or > + type of any kernel symbol, either in System.map files or the kernel binary > + itself. See Documentation/stable_api_nonsense.txt. And what about the kernel make "interface", is it considered also as non-ABI? E.g. Before ffee0de (x86: Default to ARCH=x86 to avoid overriding CONFIG_64BIT) "make defconfig ARCH=x86" produced a i386 defconfig. Now it produces a x86_64 defconfig. I'm sure some build scripted failed badly. -- Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
