Hi Stephen,
On Fri, 4 Dec 2020 21:00:00 +1100 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> Hi all,
>
> After merging the akpm tree, today's linux-next build (powerpc
> allyesconfig) produced warnings like this:
>
> ld: warning: orphan section `.data..Lubsan_data177' from `arch/powerpc/oprofile/op_model_pa6t.o' being placed in section `.data..Lubsan_data177'
>
> (lots of these latter ones)
781584 of them today!
> I don't know what produced these, but it is in the akpm-current or
> akpm trees.
Presumably the result of commit
186c3e18dba3 ("ubsan: enable for all*config builds")
from the akpm-current tree.
arch/powerpc/kernel/vmlinux.lds.S has:
#ifdef CONFIG_PPC32
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
#ifdef CONFIG_UBSAN
*(.data..Lubsan_data*)
*(.data..Lubsan_type*)
#endif
*(.data.rel*)
*(SDATA_MAIN)
added by commit
beba24ac5913 ("powerpc/32: Add .data..Lubsan_data*/.data..Lubsan_type* sections explicitly")
in 2018, but no equivalent for 64 bit.
I will try the following patch tomorrow:
From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Date: Tue, 8 Dec 2020 22:58:24 +1100
Subject: [PATCH] powerpc: Add .data..Lubsan_data*/.data..Lubsan_type* sections explicitly
Similarly to commit
beba24ac5913 ("powerpc/32: Add .data..Lubsan_data*/.data..Lubsan_type* sections explicitly")
since CONFIG_UBSAN bits can now be enabled for all*config.
Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/vmlinux.lds.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index 3b4c26e94328..0318ba436f34 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -296,6 +296,10 @@ SECTIONS
#else
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
+#ifdef CONFIG_UBSAN
+ *(.data..Lubsan_data*)
+ *(.data..Lubsan_type*)
+#endif
*(.data.rel*)
*(.toc1)
*(.branch_lt)
--
2.29.2
--
Cheers,
Stephen Rothwell
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