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From: Joel Stanley <joel@jms.id.au>
To: linuxppc-dev@lists.ozlabs.org
Cc: Anton Blanchard <anton@ozlabs.org>,
	Nick Desaulniers <ndesaulniers@google.com>
Subject: [PATCH v2 0/5] powerpc: Clang build fixes
Date: Fri, 14 Sep 2018 13:36:44 +0930	[thread overview]
Message-ID: <20180914040649.1794-1-joel@jms.id.au> (raw)

v2 rolls up all of the fixes I have into the one series, and adds a few
more fixes.

With a one patch[1] on top of clang master I can build and boot a
powernv kernel. Note that we can't build altivec code using clang
yet[2], hence disabling MD_RAID456.

$ make ARCH=powerpc powernv_defconfig
$ ./scripts/config -d BTRFS_FS -d MD_RAID456
$ make CC=clang-8 CLANG_TRIPLE=powerpc64le-linux-gnu -j128

The build is very noisy as the ftrace recordmcount build step is not
picking up -Qunused-arguments.

$ qemu-system-ppc64 -M powernv -m 3G -nographic -kernel zImage.epapr \
 -L ~/skiboot/ -initrd ~/rootfs.cpio.xz

Linux version 4.19.0-rc3-00005-g7f51dcdecc6b (joel@ozrom3) (clang version 8.0.0 (trunk 342199)) #5 SMP Fri Sep 14 13:28:57 ACST 2018

I have discovered Nick D's clangBuiltLinux issue tracker[3] and will be
updating that as we find and fix issues.

[1] https://reviews.llvm.org/D50965
[2] https://bugs.llvm.org/show_bug.cgi?id=38887
[3] https://github.com/clangBuiltLinux/linux/issues

Anton Blanchard (2):
  powerpc/Makefiles: Fix clang/llvm build
  powerpc: Fix duplicate const clang warning in user access code

Joel Stanley (3):
  powerpc/boot: Fix crt0.S syntax for clang
  powerpc/boot: Ensure _zimage_start is a weak symbol
  powerpc: Remove -mno-sched-epilog

 arch/powerpc/Makefile                    | 7 +------
 arch/powerpc/boot/crt0.S                 | 8 +++++---
 arch/powerpc/include/asm/uaccess.h       | 6 +++---
 arch/powerpc/kernel/Makefile             | 8 ++++----
 arch/powerpc/kernel/trace/Makefile       | 2 +-
 arch/powerpc/platforms/powermac/Makefile | 2 +-
 arch/powerpc/xmon/Makefile               | 2 +-
 7 files changed, 16 insertions(+), 19 deletions(-)

-- 
2.17.1

             reply	other threads:[~2018-09-14  4:07 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-14  4:06 Joel Stanley [this message]
2018-09-14  4:06 ` [PATCH v2 1/5] powerpc/Makefiles: Fix clang/llvm build Joel Stanley
2018-09-14 17:41   ` Nick Desaulniers
2018-09-20  7:04     ` Joel Stanley
2018-09-14  4:06 ` [PATCH v2 2/5] powerpc/boot: Fix crt0.S syntax for clang Joel Stanley
2018-09-14 17:47   ` Nick Desaulniers
2018-09-14 21:08     ` Segher Boessenkool
2018-09-17 20:41       ` Nick Desaulniers
2018-09-18  1:08         ` Joel Stanley
2018-09-18 10:53           ` Michael Ellerman
2018-09-14  4:06 ` [PATCH v2 3/5] powerpc/boot: Ensure _zimage_start is a weak symbol Joel Stanley
2018-09-14 17:50   ` Nick Desaulniers
2018-09-20  4:21   ` [v2,3/5] " Michael Ellerman
2018-09-14  4:06 ` [PATCH v2 4/5] powerpc: Fix duplicate const clang warning in user access code Joel Stanley
2018-09-14 17:57   ` Nick Desaulniers
2018-09-19  7:45     ` Joel Stanley
2018-09-20  4:54       ` Christophe LEROY
2018-09-20 12:35         ` Michael Ellerman
2018-09-20  4:21   ` [v2, " Michael Ellerman
2018-09-14  4:06 ` [PATCH v2 5/5] powerpc: Remove -mno-sched-epilog Joel Stanley
2018-09-14  5:06   ` Nicholas Piggin
2018-09-14 18:03     ` Nick Desaulniers
2018-09-14 20:43       ` Nicholas Piggin
2018-09-14 21:18         ` Segher Boessenkool
2018-09-14 22:20           ` Nick Desaulniers
2018-09-15  1:04             ` Segher Boessenkool

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