Subject: Re: [PATCH v2] powerpc: Do not consider weak unresolved symbol relocations as bad

From: Michael Ellerman <[email-masked]>
Date: Tue, 4 Feb 2020 23:01:31 +1100 (AEDT)

On Sat, 2020-01-18 at 17:03:35 UTC, Alexandre Ghiti wrote:
> Commit 8580ac9404f6 ("bpf: Process in-kernel BTF") introduced two weak
> symbols that may be unresolved at link time which result in an absolute
> relocation to 0. relocs_check.sh emits the following warning:
> 
> "WARNING: 2 bad relocations
> c000000001a41478 R_PPC64_ADDR64    _binary__btf_vmlinux_bin_start
> c000000001a41480 R_PPC64_ADDR64    _binary__btf_vmlinux_bin_end"
> 
> whereas those relocations are legitimate even for a relocatable kernel
> compiled with -pie option.
> 
> relocs_check.sh already excluded some weak unresolved symbols explicitly:
> remove those hardcoded symbols and add some logic that parses the symbols
> using nm, retrieves all the weak unresolved symbols and excludes those from
> the list of the potential bad relocations.
> 
> Reported-by: Stephen Rothwell <[email-masked]>
> Signed-off-by: Alexandre Ghiti <[email-masked]>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/43e76cd368fbb67e767da5363ffeaa3989993c8c

cheers