From: Nathan Chancellor <natechancellor@gmail.com>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com, linux-kbuild@vger.kernel.org,
Nick Desaulniers <ndesaulniers@google.com>,
Fangrui Song <maskray@google.com>,
Sami Tolvanen <samitolvanen@google.com>,
Dmitry Golovin <dima@golovin.in>,
Sedat Dilek <sedat.dilek@gmail.com>
Subject: [PATCH v5 0/5] Allow ld.lld to link the MIPS VDSO
Date: Tue, 28 Apr 2020 15:14:14 -0700 [thread overview]
Message-ID: <20200428221419.2530697-1-natechancellor@gmail.com> (raw)
In-Reply-To: <20200423171807.29713-1-natechancellor@gmail.com>
Hi all,
This series allows ld.lld to properly and completely link the MIPS vDSO.
Patch 1 adds ld.lld support to Kconfig so that we can avoid certain
ld.bfd checks.
Patch 2 moves disabling of the VDSO to Kconfig. This allows us to avoid
a warning with LD=ld.lld during the clean phase, when we do not have
access to CONFIG_LD_IS_LLD.
Patch 3 prepares for the shift from $(CC) to $(LD) and is probably a
worthwhile change aside from this series because GCC 4.6 is the minimum
version allowed to build the kernel.
Patch 4 does the actual shift from $(CC) to $(LD) to link the VDSO.
Patch 5 allows LD=ld.lld to build the VDSO fully through Kconfig.
I have build tested 32r2_defconfig, 32r2el_defconfig, 64r2_defconfig,
and 64r2el_defconfig with GCC and 32r2el_defconfig and
malta_kvm_guest_defconfig with clang. There is a separate issue with the
64-bit configs (https://github.com/ClangBuiltLinux/linux/issues/884) and
ld.lld does not support the triple OUTPUT_FORMAT linker script macro so
32r2_defconfig errors out in a manner similar to GCC without patch 3:
https://github.com/llvm/llvm-project/blob/46a75436f811d0e6a2c76c669140a7e9471cd2a3/lld/ELF/ScriptParser.cpp#L430
TODO: File an LLVM bug upstream
Please let me know if there are any issues!
Cheers,
Nathan
next prev parent reply other threads:[~2020-04-28 22:14 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-19 18:04 [PATCH 1/2] kbuild: add CONFIG_LD_IS_LLD Nathan Chancellor
2020-04-19 18:04 ` [PATCH 2/2] MIPS: VDSO: Do not disable VDSO when linking with ld.lld Nathan Chancellor
2020-04-19 18:17 ` Nathan Chancellor
2020-04-19 19:32 ` Masahiro Yamada
2020-04-19 20:05 ` Nathan Chancellor
2020-04-19 20:21 ` [PATCH v2 1/3] kbuild: add CONFIG_LD_IS_LLD Nathan Chancellor
2020-04-19 20:21 ` [PATCH v2 2/3] MIPS: VDSO: Move disabling the VDSO logic to Kconfig Nathan Chancellor
2020-04-20 9:53 ` Sedat Dilek
2020-04-21 2:42 ` Nathan Chancellor
2020-04-23 14:41 ` Masahiro Yamada
2020-04-19 20:21 ` [PATCH v2 3/3] MIPS: VDSO: Allow ld.lld to link the VDSO Nathan Chancellor
2020-04-23 14:38 ` [PATCH v2 1/3] kbuild: add CONFIG_LD_IS_LLD Masahiro Yamada
2020-04-23 17:18 ` [PATCH v3 1/4] " Nathan Chancellor
2020-04-23 17:18 ` [PATCH v3 2/4] MIPS: VDSO: Move disabling the VDSO logic to Kconfig Nathan Chancellor
2020-04-23 17:18 ` [PATCH v3 3/4] MIPS: VDSO: Use $(LD) instead of $(CC) to link VDSO Nathan Chancellor
2020-04-26 16:27 ` Thomas Bogendoerfer
2020-04-27 2:08 ` Nathan Chancellor
2020-04-27 16:22 ` Maciej W. Rozycki
2020-04-27 23:24 ` Nathan Chancellor
2020-04-29 17:46 ` Maciej W. Rozycki
2020-04-30 3:14 ` Nathan Chancellor
2020-04-28 2:17 ` Nathan Chancellor
2020-04-23 17:18 ` [PATCH v3 4/4] MIPS: VDSO: Allow ld.lld to link the VDSO Nathan Chancellor
2020-04-28 22:14 ` Nathan Chancellor [this message]
2020-04-28 22:14 ` [PATCH v4 1/5] kbuild: add CONFIG_LD_IS_LLD Nathan Chancellor
2020-04-29 7:13 ` Sedat Dilek
2020-04-30 3:05 ` Nathan Chancellor
2020-04-28 22:14 ` [PATCH v4 2/5] MIPS: VDSO: Move disabling the VDSO logic to Kconfig Nathan Chancellor
2020-04-28 22:14 ` [PATCH v4 3/5] MIPS: Unconditionally specify '-EB' or '-EL' Nathan Chancellor
2020-04-28 22:14 ` [PATCH v4 4/5] MIPS: VDSO: Use $(LD) instead of $(CC) to link VDSO Nathan Chancellor
2020-04-28 22:54 ` Fangrui Song
2020-04-29 0:44 ` Nathan Chancellor
2020-05-02 13:34 ` Maciej W. Rozycki
2020-05-02 13:50 ` Maciej W. Rozycki
2020-05-02 15:49 ` Nathan Chancellor
2020-04-28 22:14 ` [PATCH v4 5/5] MIPS: VDSO: Allow ld.lld to link the VDSO Nathan Chancellor
2020-04-29 7:04 ` [PATCH v5 0/5] Allow ld.lld to link the MIPS VDSO Sedat Dilek
2020-04-30 3:06 ` Nathan Chancellor
2020-05-12 8:05 ` Thomas Bogendoerfer
2020-05-12 8:28 ` Nathan Chancellor
2020-05-13 11:18 ` Thomas Bogendoerfer
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