On Thu, 13 Sep 2007 23:30:33 +0100
Denys Vlasenko <[email protected]> wrote:
> module.c and module.h conatains code for finding
> exported symbols which are declared with EXPORT_UNUSED_SYMBOL,
> and this code is compiled in even if CONFIG_UNUSED_SYMBOLS is not set
> and thus there can be no EXPORT_UNUSED_SYMBOLs in modules anyway
> (because EXPORT_UNUSED_SYMBOL(x) are compiled out to nothing then).
>
> This patch adds required #ifdefs.
>
> This shrinks module.o and each *.ko file.
>
> Patch also regroups some struct module members so
> that on 64 bit CPUs we are not wasting 32 bits on padding here:
>
> const struct kernel_symbol *unused_syms;
> unsigned int num_unused_syms;
> const unsigned long *unused_crcs;
>
> It groups counters and pointers separately.
>
> Patch makes small edit to help text of CONFIG_MODULE_UNLOAD -
> it explicitly says that without that option, kernel
> will be also faster, not only "smaller and simpler".
> When I realized how much churn is going on under the hood
> in order to make module unloading possible, I felt that
> users are not informed well enough about it in the help text.
>
> And finally, structure members which hold length of module
> code (four such members there) and count of symbols
> are converted from longs to ints.
>
> We cannot possibly have a module where 32 bits won't
> be enough to hold such counts.
>
> For one, module loading checks module size for sanity
> before loading, so such insanely big module will fail
> that test first.
>
> In short, patch makes trivial changes which are "obviously correct"
> (famous last words).
The intent seems reasonable. Would have preferred separate patches for the
separate things though..
This:
akpm:/usr/src/25> grep '^+#' patches/modulec-add-missing-ifdefs-for-config_unused_symbols.patch +#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
+#ifdef CONFIG_UNUSED_SYMBOLS
+#endif
is a bit of a maintenance problem though. Can you think of a way in whcih
we can cut down on that?
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