Re: [PATCH 4/4] s390/kernel: vmlinux.lds.S: handle orphan .rela sections

[Vasily Gorbik <gor@linux.ibm.com>]

On Tue, Feb 13, 2024 at 11:47:07AM +0100, Sumanth Korikkar wrote:
> When kernel is built with CONFIG_LD_ORPHAN_WARN and -fno-PIE, there are
> several warnings:
> 
> ld: warning: orphan section `.rela.iplt' from
> `arch/s390/kernel/head64.o' being placed in section `.rela.dyn'
> ld: warning: orphan section `.rela.head.text' from
> `arch/s390/kernel/head64.o' being placed in section `.rela.dyn'
> ld: warning: orphan section `.rela.init.text' from
> `arch/s390/kernel/head64.o' being placed in section `.rela.dyn'
> ld: warning: orphan section `.rela.rodata.cst8' from
> `arch/s390/kernel/head64.o' being placed in section `.rela.dyn'
> 
> Orphan sections are sections that exist in an object file but don't have
> a corresponding output section in the final executable. ld raises a
> warning when it identifies such sections.
> 
> Eliminate the warning by placing all .rela orphan sections in .rela.dyn
> and raise an error when size of .rela.dyn is greater than zero. i.e.
> Dont just neglect orphan sections.
> 
> This is similar to adjustment performed in x86, where kernel is built
> with -fno-PIE.
> commit 5354e84598f2 ("x86/build: Add asserts for unwanted sections")
> 
> Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
> ---
>  arch/s390/kernel/vmlinux.lds.S | 6 ++++++
>  1 file changed, 6 insertions(+)

Acked-by: Vasily Gorbik <gor@linux.ibm.com>