Hi Takashi,
On Tue, Nov 24, 2015 at 05:33:36PM +0100, Takashi Iwai wrote:
> LD vmlinux
> arch/x86/kernel/cpu/perf_event_intel_rapl.c:66:20: error: rapl_domain_names causes a section type conflict with __setup_str_set_reset_devices
> static const char *rapl_domain_names[NR_RAPL_DOMAINS] __initconst = {
> ^
> init/main.c:159:19: note: ‘__setup_str_set_reset_devices’ was declared here
> __setup("reset_devices", set_reset_devices);
>
> Hmm... I see no direct relation, but OK, let's try to get rid of
> __initconst. Now it hits lots of other errors like:
I hit the same issue, will send a patch. The other symbol is typically some
random correct symbol because gcc detects the conflict on a pair of symbols.
The problem is that placing const correctly is too difficult, the correct line
would be
static const char *const rapl_domain_names[NR_RAPL_DOMAINS] __initconst = {
>
> `__sw_hweight32' referenced in section `.text' of /tmp/ccUCMU7n.ltrans13.ltrans.o: defined in discarded section `.text' of lib/built-in.o (symbol from plugin)
> `__sw_hweight32' referenced in section `.text' of /tmp/ccUCMU7n.ltrans13.ltrans.o: defined in discarded section `.text' of lib/built-in.o (symbol from plugin)
> `__sw_hweight32' referenced in section `.text' of /tmp/ccUCMU7n.ltrans13.ltrans.o: defined in discarded section `.text' of lib/built-in.o (symbol from plugin)
> `__sw_hweight32' referenced in section `.text' of /tmp/ccUCMU7n.ltrans13.ltrans.o: defined in discarded section `.text' of lib/built-in.o (symbol from plugin)
This needs
https://git.kernel.org/cgit/linux/kernel/git/ak/linux-misc.git/commit/?h=lto-4.0&id=d826425f7a9d935d521989bd0a871b76fb4c59e2
> /tmp/ccUCMU7n.ltrans21.ltrans.o: In function `do_exit':
> <artificial>:(.text+0xfc0): undefined reference to `sys_futex'
> /tmp/ccUCMU7n.ltrans22.ltrans.o: In function `_do_fork':
> <artificial>:(.text+0x39f7): undefined reference to `ret_from_fork'
> <artificial>:(.text+0x4428): undefined reference to `ret_from_kernel_thread'
That's new, but can be fixed by adding __visible or asmlinkage to these symbols
I guess it's from the recent entry* restructuring.
I'll do an updated tree later.
Everything that's called from assembler in C needs to be marked like this. It's
fairly mechanic.
-andi
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