From: Masahiro Yamada <masahiroy@kernel.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Nicolas Schier <nicolas@fjasle.eu>,
Peter Zijlstra <peterz@infradead.org>,
linux-modules <linux-modules@vger.kernel.org>,
linux-s390 <linux-s390@vger.kernel.org>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Ard Biesheuvel <ardb@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>
Subject: Re: [PATCH v4 00/14] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL_CRCS, export.h)
Date: Tue, 10 May 2022 15:55:21 +0900 [thread overview]
Message-ID: <CAK7LNATkm+GzqNLgpbh4F+M=U8LU48p2NH9MyqeO6uA_KYJFaQ@mail.gmail.com> (raw)
In-Reply-To: <YnmSCNDBlMMJCbjj@dev-arch.thelio-3990X>
On Tue, May 10, 2022 at 7:13 AM Nathan Chancellor <nathan@kernel.org> wrote:
>
> On Mon, May 09, 2022 at 01:24:33PM +0900, Masahiro Yamada wrote:
> > On Mon, May 9, 2022 at 4:09 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
> > >
> > > This is the third batch of cleanups in this development cycle.
> > >
> > > Major changes in v4:
> > > - Move static EXPORT_SYMBOL check to a script
> > > - Some refactoring
> > >
> > > Major changes in v3:
> > >
> > > - Generate symbol CRCs as C code, and remove CONFIG_MODULE_REL_CRCS.
> > >
> > > Major changes in v2:
> > >
> > > - V1 did not work with CONFIG_MODULE_REL_CRCS.
> > > I fixed this for v2.
> > >
> > > - Reflect some review comments in v1
> > >
> > > - Refactor the code more
> > >
> > > - Avoid too long argument error
> >
> > This series is available at
> > git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
> > lto-cleanup-v4
>
> Hi Masahiro,
>
> I checked this out and went to run it through my QEMU tests but I see
> two new errors.
>
> Failure #1:
>
> In file included from scripts/mod/section-check.c:3:
> scripts/mod/modpost.h:15:10: fatal error: 'elfconfig.h' file not found
> #include "elfconfig.h"
> ^~~~~~~~~~~~~
> 1 error generated.
>
> I was able to get past that with
>
> diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
> index ca739c6c68a1..c33b83bfbcad 100644
> --- a/scripts/mod/Makefile
> +++ b/scripts/mod/Makefile
> @@ -16,7 +16,7 @@ targets += $(devicetable-offsets-file) devicetable-offsets.s
>
> # dependencies on generated files need to be listed explicitly
>
> -$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o: $(obj)/elfconfig.h
> +$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o $(obj)/section-check.o: $(obj)/elfconfig.h
> $(obj)/file2alias.o: $(obj)/$(devicetable-offsets-file)
>
Thanks for testing.
I will slightly refactor the code as follows.
@@ -16,7 +16,7 @@ targets += $(devicetable-offsets-file) devicetable-offsets.s
# dependencies on generated files need to be listed explicitly
-$(obj)/modpost.o $(obj)/file2alias.o $(obj)/sumversion.o: $(obj)/elfconfig.h
+$(addprefix $(obj)/, $(modpost-objs)): $(obj)/elfconfig.h
$(obj)/file2alias.o: $(obj)/$(devicetable-offsets-file)
quiet_cmd_elfconfig = MKELF $@
> quiet_cmd_elfconfig = MKELF $@
>
> Failure #2:
>
> GEN .version
> CHK include/generated/compile.h
> GEN .tmp_initcalls.lds
> LTO vmlinux.o
> OBJTOOL vmlinux.o
> MODPOST vmlinux.symvers
> MODINFO modules.builtin.modinfo
> GEN modules.builtin
> LD .tmp_vmlinux.btf
> ld.lld: error: cannot open .vmlinux.export.o: No such file or directory
> BTF .btf.vmlinux.bin.o
> pahole: .tmp_vmlinux.btf: No such file or directory
> CC .vmlinux.export.c
> LD .tmp_vmlinux.kallsyms1
> ld.lld: error: .btf.vmlinux.bin.o: unknown file type
> make[1]: *** [Makefile:1159: vmlinux] Error 1
>
> I was not really able to see what is going wrong here. Attached is the
> configuration that I ran into this with. If you need any other
> information, please let me know!
Ah, OK.
This is because .vmlinux.export.o is compiled after gen_btf.
I will swap the order in v5.
> Cheers,
> Nathan
--
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2022-05-10 6:57 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-08 19:06 [PATCH v4 00/14] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL_CRCS, export.h) Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 01/14] modpost: remove left-over cross_compile declaration Masahiro Yamada
2022-05-09 17:08 ` Nick Desaulniers
2022-05-12 4:35 ` Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 02/14] modpost: change the license of EXPORT_SYMBOL to bool type Masahiro Yamada
2022-05-12 4:36 ` Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 03/14] modpost: split the section mismatch checks into section-check.c Masahiro Yamada
2022-05-09 17:19 ` Nick Desaulniers
2022-05-10 6:55 ` Masahiro Yamada
2022-05-11 18:47 ` Nick Desaulniers
2022-05-11 19:27 ` Masahiro Yamada
2022-05-11 19:51 ` Jeff Johnson
2022-05-11 20:01 ` Nick Desaulniers
2022-05-08 19:06 ` [PATCH v4 04/14] modpost: add sym_find_with_module() helper Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 05/14] modpost: extract symbol versions from *.cmd files Masahiro Yamada
2022-05-09 21:52 ` Sami Tolvanen
2022-05-08 19:06 ` [PATCH v4 06/14] kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS Masahiro Yamada
2022-05-09 17:50 ` Nick Desaulniers
2022-05-10 13:03 ` Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 07/14] kbuild: stop merging *.symversions Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 08/14] genksyms: adjust the output format to modpost Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 09/14] kbuild: do not create *.prelink.o for Clang LTO or IBT Masahiro Yamada
2022-05-09 23:13 ` Sami Tolvanen
2022-05-08 19:06 ` [PATCH v4 10/14] kbuild: check static EXPORT_SYMBOL* by script instead of modpost Masahiro Yamada
2022-05-09 18:05 ` Nick Desaulniers
2022-05-10 13:53 ` Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 11/14] kbuild: make built-in.a rule robust against too long argument error Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 12/14] kbuild: make *.mod " Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 13/14] kbuild: add cmd_and_savecmd macro Masahiro Yamada
2022-05-08 19:06 ` [PATCH v4 14/14] kbuild: rebuild multi-object modules when objtool is updated Masahiro Yamada
2022-05-09 4:24 ` [PATCH v4 00/14] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL_CRCS, export.h) Masahiro Yamada
2022-05-09 22:13 ` Nathan Chancellor
2022-05-10 6:55 ` Masahiro Yamada [this message]
2022-05-09 22:19 ` Nathan Chancellor
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