On Tue, 02 May 2006 16:53:07 +0200 Arjan van de Ven wrote:
> Hi,
> As discussed on lkml before; the patch with the infrastructure to deprecate unused symbols
>
> This is patch one in a series of 17; to not overload lkml the other 16 will be mailed direct;
> people who want to see them all can see them at http://www.fenrus.org/unused
>
>
>
> This patch temporarily adds EXPORT_UNUSED_SYMBOL and EXPORT_UNUSED_SYMBOL_GPL.
> These will be used as transition measure for symbols that aren't used in the
> kernel and are on the way out. When a module uses such a symbol, a warning
> is printk'd at modprobe time.
>
> The main reason for removing unused exports is size: eacho export takes roughly
> between 100 and 150 bytes of kernel space in the binary. This patch gives
> users the option to immediately get this size gain via a config option.
Do the exports take any space at runtime in RAM?
or is this only on-disk or wherever the kernel image lives?
> It would be nice to at least get this infrastructure into 2.6.17 even if
> the rest of this series won't get there.
> --- linux-2.6.17-rc3-mm1-unused.orig/Documentation/feature-removal-schedule.txt
> +++ linux-2.6.17-rc3-mm1-unused/Documentation/feature-removal-schedule.txt
> @@ -22,6 +22,16 @@ Who: Adrian Bunk <[email protected]>
>
> ---------------------------
>
> +What: Unused EXPORT_SYMBOL/EXPORT_SYMBOL_GPL exports
> + (temporary transition config option provided until then)
> + The transition config option will also be removed at the same time.
> +When: before 2.6.19
> +Why: Unused symbols are both increasing the size of the kernel binary
> + and are often a sign of "wrong API"
> +Who: Arjan van de Ven <[email protected]>
scsi patch comments (only one that I have seen) say:
+EXPORT_UNUSED_SYMBOL(scsi_print_status); /* removal in 2.6.19 */
and When: above says "before 2.6.19". Those don't agree.
Please fix. Thanks.
---
~Randy
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