Buildresult: kbuild/ppc40x_defconfig/powerpc-gcc4.6 built on Aug 30 2019, 05:52

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Status:	OK
Date/Time:	Aug 30 2019, 05:52
Duration:	0:00:46.701151
Builder:	ka1
Revision:	kbuild: Do not enable -Wimplicit-fallthrough for clang for now (`e2079e93f562c7f7a030eb7642017ee5eabaaa10)`
Target:	kbuild/ppc40x_defconfig/powerpc-gcc4.6
Branch:	kbuild
Compiler:	powerpc-gcc4.6 (powerpc-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	ppc40x_defconfig (download)
Log:	Download original Possible warnings (3) kernel/printk/printk.c:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify e2079e93f562c7f7a030eb7642017ee5eabaaa10^{commit} e2079e93f562c7f7a030eb7642017ee5eabaaa10 already have revision, skipping fetch # 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/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version # < git log --format=%s --max-count=1 e2079e93f562c7f7a030eb7642017ee5eabaaa10 # < make -s -j 48 ARCH=powerpc O=/kisskb/build/kbuild_ppc40x_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- ppc40x_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/kbuild_ppc40x_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here /kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq': /kisskb/src/drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here INFO: Uncompressed kernel (size 0x539774) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x539774) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x539774) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x539774) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) Image Name: Linux-5.3.0-rc4-ge2079e93f562 Created: Fri Aug 30 05:53:35 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2659515 Bytes = 2597.18 KiB = 2.54 MiB Load Address: 00600000 Entry Point: 00601758 INFO: Uncompressed kernel (size 0x529100) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) Image Name: Linux-5.3.0-rc4-ge2079e93f562 Created: Fri Aug 30 05:53:35 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2627283 Bytes = 2565.71 KiB = 2.51 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.3.0-rc4-ge2079e93f562 Created: Fri Aug 30 05:53:36 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2659944 Bytes = 2597.60 KiB = 2.54 MiB Load Address: 00600000 Entry Point: 006019cc Completed OK # rm -rf /kisskb/build/kbuild_ppc40x_defconfig_powerpc-gcc4.6 # Build took: 0:00:46.701151

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