linux-kernel - Re: linux-next: manual merge of the net-next tree with the kbuild tree

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Date:   Thu, 15 Aug 2019 22:21:29 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: linux-next: manual merge of the net-next tree with the kbuild tree

On Thu, Aug 15, 2019 at 7:42 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
>
> Today's linux-next merge of the net-next tree got a conflict in:
>
>   scripts/link-vmlinux.sh
>
> between commit:
>
>   e167191e4a8a ("kbuild: Parameterize kallsyms generation and correct reporting")
>
> from the kbuild tree and commits:
>
>   341dfcf8d78e ("btf: expose BTF info through sysfs")
>   7fd785685e22 ("btf: rename /sys/kernel/btf/kernel into /sys/kernel/btf/vmlinux")
>
> from the net-next tree.
>
> I fixed it up (I think - see below) and can carry the fix as necessary.

Thanks, Stephen! Looks good except one minor issue below.

> This is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
>
> --
> Cheers,
> Stephen Rothwell
>
> diff --cc scripts/link-vmlinux.sh
> index 2438a9faf3f1,c31193340108..000000000000
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@@ -56,11 -56,10 +56,11 @@@ modpost_link(
>   }
>
>   # Link of vmlinux
> - # ${1} - optional extra .o files
> - # ${2} - output file
> + # ${1} - output file
> + # ${@:2} - optional extra .o files
>   vmlinux_link()
>   {
>  +      info LD ${2}

This needs to be ${1}.

>         local lds="${objtree}/${KBUILD_LDS}"
>         local objects
>
> @@@ -139,18 -149,6 +150,18 @@@ kallsyms(
>         ${CC} ${aflags} -c -o ${2} ${afile}
>   }
>
>  +# Perform one step in kallsyms generation, including temporary linking of
>  +# vmlinux.
>  +kallsyms_step()
>  +{
>  +      kallsymso_prev=${kallsymso}
>  +      kallsymso=.tmp_kallsyms${1}.o
>  +      kallsyms_vmlinux=.tmp_vmlinux${1}
>  +
> -       vmlinux_link "${kallsymso_prev}" ${kallsyms_vmlinux}
> ++      vmlinux_link ${kallsyms_vmlinux} "${kallsymso_prev}" ${btf_vmlinux_bin_o}
>  +      kallsyms ${kallsyms_vmlinux} ${kallsymso}
>  +}
>  +
>   # Create map file with all symbols from ${1}
>   # See mksymap for additional details
>   mksysmap()
> @@@ -228,8 -227,14 +240,15 @@@ ${MAKE} -f "${srctree}/scripts/Makefile
>   info MODINFO modules.builtin.modinfo
>   ${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo
>
> + btf_vmlinux_bin_o=""
> + if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
> +       if gen_btf .tmp_vmlinux.btf .btf.vmlinux.bin.o ; then
> +               btf_vmlinux_bin_o=.btf.vmlinux.bin.o
> +       fi
> + fi
> +
>   kallsymso=""
>  +kallsymso_prev=""
>   kallsyms_vmlinux=""
>   if [ -n "${CONFIG_KALLSYMS}" ]; then
>
> @@@ -268,11 -285,8 +287,7 @@@
>         fi
>   fi
>
> - vmlinux_link "${kallsymso}" vmlinux
> -
> - if [ -n "${CONFIG_DEBUG_INFO_BTF}" ]; then
> -       gen_btf vmlinux
> - fi
>  -info LD vmlinux
> + vmlinux_link vmlinux "${kallsymso}" "${btf_vmlinux_bin_o}"
>
>   if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then
>         info SORTEX vmlinux