Buildresult: kbuild/arm64-defconfig/arm64-gcc5 built on Aug 30 2019, 05:39

kisskb

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Status:	OK
Date/Time:	Aug 30 2019, 05:39
Duration:	0:04:56.199698
Builder:	ka1
Revision:	kbuild: Do not enable -Wimplicit-fallthrough for clang for now (`e2079e93f562c7f7a030eb7642017ee5eabaaa10)`
Target:	kbuild/arm64-defconfig/arm64-gcc5
Branch:	kbuild
Compiler:	arm64-gcc5 (aarch64-linux-gcc.br_real (Buildroot 2016.11-git-00613-ge98b4dd) 5.4.0 / GNU ld (GNU Binutils) 2.25.1)
Config:	defconfig (download)
Log:	Download original Possible warnings (9) warning: The last gc run reported the following. Please correct the root cause warning: There are too many unreachable loose objects; run 'git prune' to remove them. drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wmaybe-uninitialized] include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] WARNING: "ahci_em_messages" [vmlinux] is a static EXPORT_SYMBOL_GPL WARNING: "HYPERVISOR_platform_op" [vmlinux] is a static EXPORT_SYMBOL_GPL WARNING: "drm_client_close" [drivers/gpu/drm/drm] is a static EXPORT_SYMBOL WARNING: "ahci_em_messages" [vmlinux] is a static EXPORT_SYMBOL_GPL WARNING: "HYPERVISOR_platform_op" [vmlinux] is a static EXPORT_SYMBOL_GPL Full Log # git rev-parse -q --verify e2079e93f562c7f7a030eb7642017ee5eabaaa10^{commit} # git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next warning: The last gc run reported the following. Please correct the root cause and remove .git/gc.log. Automatic cleanup will not be performed until the file is removed. warning: There are too many unreachable loose objects; run 'git prune' to remove them. # git rev-parse -q --verify e2079e93f562c7f7a030eb7642017ee5eabaaa10^{commit} e2079e93f562c7f7a030eb7642017ee5eabaaa10 # git checkout -q -f -B kisskb e2079e93f562c7f7a030eb7642017ee5eabaaa10 # git clean -qxdf # < git log -1 # commit e2079e93f562c7f7a030eb7642017ee5eabaaa10 # Author: Nathan Chancellor <natechancellor@gmail.com> # Date: Mon Aug 26 17:41:55 2019 -0700 # # kbuild: Do not enable -Wimplicit-fallthrough for clang for now # # This functionally reverts commit bfd77145f35c ("Makefile: Convert # -Wimplicit-fallthrough=3 to just -Wimplicit-fallthrough for clang"). # # clang enabled support for -Wimplicit-fallthrough in C in r369414 [1], # which causes a lot of warnings when building the kernel for two reasons: # # 1. Clang does not support the /* fall through */ comments. There seems # to be a general consensus in the LLVM community that this is not # something they want to support. Joe Perches wrote a script to convert # all of the comments to a "fallthrough" keyword that will be added to # compiler_attributes.h [2] [3], which catches the vast majority of the # comments. There doesn't appear to be any consensus in the kernel # community when to do this conversion. # # 2. Clang and GCC disagree about falling through to final case statements # with no content or cases that simply break: # # https://godbolt.org/z/c8csDu # # This difference contributes at least 50 warnings in an allyesconfig # build for x86, not considering other architectures. This difference # will need to be discussed to see which compiler is right [4] [5]. # # [1]: https://github.com/llvm/llvm-project/commit/1e0affb6e564b7361b0aadb38805f26deff4ecfc # [2]: https://lore.kernel.org/lkml/61ddbb86d5e68a15e24ccb06d9b399bbf5ce2da7.camel@perches.com/ # [3]: https://lore.kernel.org/lkml/1d2830aadbe9d8151728a7df5b88528fc72a0095.1564549413.git.joe@perches.com/ # [4]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91432 # [5]: https://github.com/ClangBuiltLinux/linux/issues/636 # # Given these two problems need discussion and coordination, do not enable # -Wimplicit-fallthrough with clang right now. Add a comment to explain # what is going on as well. This commit should be reverted once these two # issues are fully flushed out and resolved. # # Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com> # Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> # Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> # Acked-by: Nick Desaulniers <ndesaulniers@google.com> # Acked-by: Gustavo A. R. Silva <gustavo@embeddedor.com> # Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> # < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version # < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version # < git log --format=%s --max-count=1 e2079e93f562c7f7a030eb7642017ee5eabaaa10 # < make -s -j 48 ARCH=arm64 O=/kisskb/build/kbuild_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux- defconfig # make -s -j 48 ARCH=arm64 O=/kisskb/build/kbuild_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux- arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum arch/arm64/Makefile:38: LSE atomics not supported by binutils arch/arm64/Makefile:56: CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built /kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c: In function 'sh_mobile_i2c_isr': /kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wmaybe-uninitialized] pd->msg->buf[real_pos] = data; ^ /kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:372:16: note: 'data' was declared here unsigned char data; ^ In file included from /kisskb/src/include/linux/rwsem.h:16:0, from /kisskb/src/include/linux/notifier.h:15, from /kisskb/src/include/linux/clk.h:14, from /kisskb/src/drivers/tty/serial/sh-sci.c:24: /kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_dma_rx_submit': /kisskb/src/include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] _raw_spin_unlock_irqrestore(lock, flags); \ ^ /kisskb/src/drivers/tty/serial/sh-sci.c:1353:16: note: 'flags' was declared here unsigned long flags; ^ WARNING: "ahci_em_messages" [vmlinux] is a static EXPORT_SYMBOL_GPL WARNING: "HYPERVISOR_platform_op" [vmlinux] is a static EXPORT_SYMBOL_GPL WARNING: "drm_client_close" [drivers/gpu/drm/drm] is a static EXPORT_SYMBOL WARNING: "ahci_em_messages" [vmlinux] is a static EXPORT_SYMBOL_GPL WARNING: "HYPERVISOR_platform_op" [vmlinux] is a static EXPORT_SYMBOL_GPL Completed OK # rm -rf /kisskb/build/kbuild_arm64-defconfig_arm64-gcc5.4 # Build took: 0:04:56.199698

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