From: Mike Frysinger <vapier.adi@gmail.com> To: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Cc: greg@kroah.com, linux-kbuild@vger.kernel.org, carmelo73@gmail.com, linux-kernel@vger.kernel.org, rusty@rustcorp.com.au Subject: Re: [PATCH 04/10] module: make MODULE_SYMBOL_PREFIX into a CONFIG option Date: Tue, 3 Nov 2009 05:19:19 -0500 [thread overview] Message-ID: <8bd0f97a0911030219y685a1dafy2a8e066d7132ac45@mail.gmail.com> (raw) In-Reply-To: <1257242782-10496-5-git-send-email-alan-jenkins@tuffmail.co.uk> On Tue, Nov 3, 2009 at 05:06, Alan Jenkins wrote: > The next commit will require the use of MODULE_SYMBOL_PREFIX in > .tmp_exports-asm.S. Currently it is mixed in with C structure > definitions in "asm/module.h". Move the definition of this arch option > into Kconfig, so it can be easily accessed by any code. > > This also lets modpost.c use the same definition. Previously modpost > relied on a hardcoded list of architectures in mk_elfconfig.c. this should also let us push VMLINUX_SYMBOL() out of arch/*/kernel/vmlinux.lds.S and into asm-generic/vmlinux.lds.h ... > A build test for blackfin, one of the two MODULE_SYMBOL_PREFIX archs, > showed the generated code was unchanged. vmlinux was identical save > for build ids, and an apparently randomized suffix on a single "__key" > symbol in the kallsyms data). when you get localized (static) namespace collisions, the linker automatically does that > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -1171,6 +1171,17 @@ config MODULE_SRCVERSION_ALL > > endif # MODULES > > +config HAVE_SYMBOL_PREFIX > + bool > + help > + Some arch toolchains use a `_' prefix for all user symbols. > + This option will be taken into account when loading modules. > + > +config SYMBOL_PREFIX > + string > + default "_" if HAVE_SYMBOL_PREFIX > + default "" in practice, the symbol prefix is an underscore. but there is no technical limitation here -- the toolchain could use whatever prefix they wanted so if the Kconfig option was pushed to arch/*/Kconfig, we could drop HAVE_SYMBOL_PREFIX and let the arch declare the exact SYMBOL_PREFIX value itself -mike
WARNING: multiple messages have this Message-ID (diff)
From: Mike Frysinger <vapier.adi@gmail.com> To: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Cc: greg@kroah.com, linux-kbuild@vger.kernel.org, carmelo73@gmail.com, linux-kernel@vger.kernel.org, rusty@rustcorp.com.au Subject: Re: [PATCH 04/10] module: make MODULE_SYMBOL_PREFIX into a CONFIG option Date: Tue, 3 Nov 2009 05:19:19 -0500 [thread overview] Message-ID: <8bd0f97a0911030219y685a1dafy2a8e066d7132ac45@mail.gmail.com> (raw) In-Reply-To: <1257242782-10496-5-git-send-email-alan-jenkins@tuffmail.co.uk> On Tue, Nov 3, 2009 at 05:06, Alan Jenkins wrote: > The next commit will require the use of MODULE_SYMBOL_PREFIX in > .tmp_exports-asm.S. Currently it is mixed in with C structure > definitions in "asm/module.h". Move the definition of this arch option > into Kconfig, so it can be easily accessed by any code. > > This also lets modpost.c use the same definition. Previously modpost > relied on a hardcoded list of architectures in mk_elfconfig.c. this should also let us push VMLINUX_SYMBOL() out of arch/*/kernel/vmlinux.lds.S and into asm-generic/vmlinux.lds.h ... > A build test for blackfin, one of the two MODULE_SYMBOL_PREFIX archs, > showed the generated code was unchanged. vmlinux was identical save > for build ids, and an apparently randomized suffix on a single "__key" > symbol in the kallsyms data). when you get localized (static) namespace collisions, the linker automatically does that > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -1171,6 +1171,17 @@ config MODULE_SRCVERSION_ALL > > endif # MODULES > > +config HAVE_SYMBOL_PREFIX > + bool > + help > + Some arch toolchains use a `_' prefix for all user symbols. > + This option will be taken into account when loading modules. > + > +config SYMBOL_PREFIX > + string > + default "_" if HAVE_SYMBOL_PREFIX > + default "" in practice, the symbol prefix is an underscore. but there is no technical limitation here -- the toolchain could use whatever prefix they wanted so if the Kconfig option was pushed to arch/*/Kconfig, we could drop HAVE_SYMBOL_PREFIX and let the arch declare the exact SYMBOL_PREFIX value itself -mike
next prev parent reply other threads:[~2009-11-03 10:19 UTC|newest] Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top 2009-11-02 16:52 Fast LKM symbol resolution Alan Jenkins 2009-11-03 3:55 ` Greg KH 2009-11-03 10:06 ` [PATCH 0/10] module: Speed up symbol resolution during module loading (using binary search) Alan Jenkins 2009-11-03 15:58 ` Greg KH 2009-11-05 12:17 ` Rusty Russell 2009-11-03 10:06 ` [PATCH 01/10] ARM: use unified discard definition in linker script Alan Jenkins 2009-11-03 10:06 ` [PATCH 02/10] ARM: unexport symbols used to implement floating point emulation Alan Jenkins 2009-11-03 10:06 ` [PATCH 03/10] module: extract __EXPORT_SYMBOL from module.h into mod_export.h Alan Jenkins 2009-11-03 10:06 ` [PATCH 04/10] module: make MODULE_SYMBOL_PREFIX into a CONFIG option Alan Jenkins 2009-11-03 10:19 ` Mike Frysinger [this message] 2009-11-03 10:19 ` Mike Frysinger 2009-11-03 12:16 ` Alan Jenkins 2009-11-03 12:30 ` Mike Frysinger 2009-11-03 12:30 ` Mike Frysinger 2009-11-03 13:29 ` Paul Mundt 2009-11-03 13:39 ` Mike Frysinger 2009-11-03 13:39 ` Mike Frysinger 2009-11-03 13:46 ` Paul Mundt 2009-11-03 13:58 ` Mike Frysinger 2009-11-03 13:58 ` Mike Frysinger 2009-11-03 14:07 ` Paul Mundt 2009-11-03 10:06 ` [PATCH 05/10] kbuild: sort the list of symbols exported by the kernel (__ksymtab) Alan Jenkins 2009-11-04 8:19 ` Rusty Russell 2009-11-04 10:00 ` Alan Jenkins 2009-11-04 11:12 ` Mike Frysinger 2009-11-04 11:12 ` Mike Frysinger 2009-11-04 17:19 ` Sam Ravnborg 2009-11-05 14:24 ` Alan Jenkins 2009-11-05 16:17 ` Mike Frysinger 2009-11-05 16:17 ` Mike Frysinger 2009-11-09 3:17 ` Rusty Russell 2009-11-20 22:20 ` Tony Luck 2009-11-20 22:20 ` Tony Luck 2009-11-21 0:02 ` Alan Jenkins 2009-11-23 19:53 ` Alex Chiang 2009-11-23 22:44 ` Alan Jenkins 2009-11-24 0:57 ` Rusty Russell 2009-11-24 5:39 ` James Bottomley 2009-11-24 9:28 ` Alan Jenkins 2009-11-24 22:43 ` James Bottomley 2009-11-25 9:15 ` Alan Jenkins 2009-11-25 15:08 ` James Bottomley 2009-11-25 17:01 ` Alan Jenkins 2009-11-27 11:03 ` Rusty Russell 2009-11-26 0:40 ` Andrew Morton 2009-11-26 17:14 ` Alan Jenkins 2009-11-03 10:06 ` [PATCH 06/10] module: refactor symbol tables and try to reduce code size of each_symbol() Alan Jenkins 2009-11-04 8:28 ` Rusty Russell 2009-11-04 9:45 ` Alan Jenkins 2009-11-03 10:06 ` [PATCH 07/10] lib: Add generic binary search function to the kernel Alan Jenkins 2009-11-03 10:06 ` [PATCH 08/10] lib: bsearch - remove redundant special case for arrays of size 0 Alan Jenkins 2009-11-03 10:06 ` [PATCH 09/10] module: speed up find_symbol() using binary search on the builtin symbol tables Alan Jenkins 2009-11-04 8:31 ` Rusty Russell 2009-11-03 10:06 ` [PATCH 10/10] module: fix is_exported() to return true for all types of exports Alan Jenkins 2009-11-04 8:32 ` Rusty Russell 2009-11-06 5:37 ` Fast LKM symbol resolution Carmelo Amoroso
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