Buildresult: linus/dove_defconfig/arm-gcc4.9 built on Jun 22 2020, 19:49

kisskb

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Status:	OK
Date/Time:	Jun 22 2020, 19:49
Duration:	0:00:57.117231
Builder:	ka2
Revision:	Revert "kernel/printk: add kmsg SEEK_CUR handling" (`625d3449788f85569096780592549d0340e9c0c7)`
Target:	linus/dove_defconfig/arm-gcc4.9
Branch:	linus
Compiler:	arm-gcc4.9 (arm-linux-gnueabi-gcc (GCC) 4.9.4 / GNU ld (GNU Binutils) 2.29.1.20170915)
Config:	dove_defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify 625d3449788f85569096780592549d0340e9c0c7^{commit} 625d3449788f85569096780592549d0340e9c0c7 already have revision, skipping fetch # git checkout -q -f -B kisskb 625d3449788f85569096780592549d0340e9c0c7 # git clean -qxdf # < git log -1 # commit 625d3449788f85569096780592549d0340e9c0c7 # Author: Jason A. Donenfeld <Jason@zx2c4.com> # Date: Sun Jun 21 21:02:22 2020 -0600 # # Revert "kernel/printk: add kmsg SEEK_CUR handling" # # This reverts commit 8ece3b3eb576a78d2e67ad4c3a80a39fa6708809. # # This commit broke userspace. Bash uses ESPIPE to determine whether or # not the file should be read using "unbuffered I/O", which means reading # 1 byte at a time instead of 128 bytes at a time. I used to use bash to # read through kmsg in a really quite nasty way: # # while read -t 0.1 -r line 2>/dev/null \|\| [[ $? -ne 142 ]]; do # echo "SARU $line" # done < /dev/kmsg # # This will show all lines that can fit into the 128 byte buffer, and skip # lines that don't. That's pretty awful, but at least it worked. # # With this change, bash now tries to do 1-byte reads, which means it # skips all the lines, which is worse than before. # # Now, I don't really care very much about this, and I'm already look for # a workaround. But I did just spend an hour trying to figure out why my # scripts were broken. Either way, it makes no difference to me personally # whether this is reverted, but it might be something to consider. If you # declare that "trying to read /dev/kmsg with bash is terminally stupid # anyway," I might be inclined to agree with you. But do note that bash # uses lseek(fd, 0, SEEK_CUR)==>ESPIPE to determine whether or not it's # reading from a pipe. # # Cc: Bruno Meneguele <bmeneg@redhat.com> # Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> # Cc: Steven Rostedt <rostedt@goodmis.org> # Cc: David Laight <David.Laight@ACULAB.COM> # Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> # Cc: Petr Mladek <pmladek@suse.com> # Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc --version # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-ld --version # < git log --format=%s --max-count=1 625d3449788f85569096780592549d0340e9c0c7 # < make -s -j 24 ARCH=arm O=/kisskb/build/linus_dove_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi- dove_defconfig # < make -s -j 24 ARCH=arm O=/kisskb/build/linus_dove_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi- help # make -s -j 24 ARCH=arm O=/kisskb/build/linus_dove_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi- olddefconfig # make -s -j 24 ARCH=arm O=/kisskb/build/linus_dove_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi- Completed OK # rm -rf /kisskb/build/linus_dove_defconfig_arm-gcc4.9 # Build took: 0:00:57.117231

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