Hi Stephen, On Fri, 4 Dec 2020 21:00:00 +1100 Stephen Rothwell 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 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 --- 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