linux-kernel - Re: powerpc allyesconfig / allmodconfig linux-next next-20160729

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Date:	Thu, 04 Aug 2016 12:37:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Nicholas Piggin <npiggin@...il.com>,
	"Luis R. Rodriguez" <mcgrof@...nel.org>,
	linux-next@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: powerpc allyesconfig / allmodconfig linux-next next-20160729 - next-20160729 build failures

On Thursday, August 4, 2016 11:00:49 AM CEST Arnd Bergmann wrote:
> I tried this
> 
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> index b5e40ed86e60..89bca1a25916 100755
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@ -44,7 +44,7 @@ modpost_link()
>         local objects
>  
>         if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
> -               objects="--whole-archive ${KBUILD_VMLINUX_INIT} ${KBUILD_VMLINUX_MAIN} --no-whole-archive"
> +               objects="${KBUILD_VMLINUX_INIT} ${KBUILD_VMLINUX_MAIN}"
>         else
>                 objects="${KBUILD_VMLINUX_INIT} --start-group ${KBUILD_VMLINUX_MAIN} --end-group"
>         fi
> 
> but that did not seem to change anything, the extra symbols are
> still there. I have not tried to understand what that actually
> does, so maybe I misunderstood your suggestion.
> 

On a second attempt, I did the same change for vmlinux instead of the
module (d'oh), and got a link failure instead:

arch/arm/mm/proc-xscale.o: In function `cpu_xscale_do_resume':
(.text+0x3d4): undefined reference to `cpu_resume_mmu'
arch/arm/kernel/setup.o: In function `setup_arch':
setup.c:(.init.text+0x910): undefined reference to `init_uts_ns'
kernel/nsproxy.o:(.data+0x4): undefined reference to `init_uts_ns'
kernel/sched/core.o: In function `update_rq_clock':
core.c:(.text+0x6d8): undefined reference to `paravirt_steal_rq_enabled'
core.c:(.text+0x6dc): undefined reference to `pv_time_ops'
kernel/sched/cputime.o: In function `account_process_tick':
cputime.c:(.text+0x794): undefined reference to `paravirt_steal_enabled'
cputime.c:(.text+0x7a0): undefined reference to `pv_time_ops'
kernel/locking/lockdep.o: In function `save_trace':
lockdep.c:(.text+0xfe8): undefined reference to `save_stack_trace'
kernel/module.o: In function `load_module':
module.c:(.text+0x1b54): undefined reference to `elf_check_arch'
module.c:(.text+0x2024): undefined reference to `apply_relocate'
kernel/debug/debug_core.o: In function `kgdb_unregister_io_module':
debug_core.c:(.text+0x2e4): undefined reference to `kgdb_arch_exit'
kernel/debug/debug_core.o: In function `kgdb_arch_set_breakpoint':
debug_core.c:(.text+0x3bc): undefined reference to `arch_kgdb_ops'
kernel/debug/debug_core.o: In function `dbg_remove_all_break':
debug_core.c:(.text+0x6d0): undefined reference to `arch_kgdb_ops'
...

However, I also see a link failure in some rare configurations
with just your patch:

arch/arm/lib/lib.a(io-acorn.o): In function `outsl':
(.text+0x38): undefined reference to `printk'

The problem being a file in a library object that is not referenced,
but that references another symbol that is not defined
(CONFIG_PRINTK=n).

	Arnd