On Fri, Feb 21, 2014 at 12:16:27PM -0800, Andrew Morton wrote: > On Fri, 21 Feb 2014 10:11:06 -0800 Josh Triplett <[email protected]> > wrote: > > uselib hasn't been used since libc5; glibc does not use it. Support > > turning it off. > > > > When disabled, also omit the load_elf_library implementation from > > binfmt_elf.c, which only uselib invokes. > > > > bloat-o-meter: > > add/remove: 0/4 grow/shrink: 0/1 up/down: 0/-785 (-785) > > function old new delta > > padzero 39 36 -3 > > uselib_flags 20 - -20 > > sys_uselib 168 - -168 > > SyS_uselib 168 - -168 > > load_elf_library 426 - -426 > > > > The patch disables CONFIG_USELIB by default. This important decision > should be mentioned and justified in the changelog, please.
Gah, that was not intentional. Will fix in v2. I did very intentionally not make it require CONFIG_EXPERT or CONFIG_EMBEDDED, since (like CONFIG_BINFMT_AOUT) almost everyone will want it disabled, but I had intended to make it "default y". > > +#ifdef CONFIG_USELIB > > I wonder if CONFIG_SYS_USELIB would be a better identifier. We haven't > done anything consistent here. As far as I can tell, there's no use of CONFIG_SYS_* or any other consistent prefix for configuring out syscalls; all such symbols appear unprefixed. I think it would make sense to have a single common menu and prefix for configuring out unused syscalls, but given the large number of existing Kconfig options for that, I think that change ought to occur as a separate patch series that isn't also trying to add a new such option. Perhaps Dave Hansen (CCed) might be interested in incorporating such a change into his ongoing kconfig consolidation and reorganization? - Josh Triplett -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
