On Thu, 22 Nov 2007 03:43:06 +0100 (CET)
Andi Kleen <[email protected]> wrote:
>
> There seems to be rough consensus that the kernel currently has too
> many exported symbols. A lot of these exports are generally usable
> utility functions or important driver interfaces; but another large
> part are functions intended by only one or two very specific modules
> for a very specific purpose. One example is the TCP code. It has most
> of its internals exported, but only for use by tcp_ipv6.c (and now a
> few more by the TCP/IP congestion modules) But it doesn't make sense
> to include these exported for a specific module functions into a
> broader "kernel interface". External modules assume they can use
> these functions, but they were never intended for that.
>
> This patch allows to export symbols only for specific modules by
> introducing symbol name spaces. A module name space has a white
> list of modules that are allowed to import symbols for it; all others
> can't use the symbols.
>
> It adds two new macros:
>
> MODULE_NAMESPACE_ALLOW(namespace, module);
>
> Allow module to import symbols from namespace. module is the module
> name without .ko as displayed by lsmod. Must be in the same module
> as the export (and be duplicated if there are multiple modules
> exporting symbols to a namespace). Multiple allows for the same name
> space are allowed.
>
> EXPORT_SYMBOL_NS(namespace, symbol);
>
Hi,
I like this concept in general; I have one minor comment; right now
your namespace argument is like
EXPORT_SYMBOL_NS(foo, some_symbol);
from a language-like pov I kinda wonder if it's nicer to do
EXPORT_SYMBOL_NS("foo", some_symbol);
because foo isn't something in C scope, but more a string-like
identifier...
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