# 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 # 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 # Cc: Sergey Senozhatsky # Cc: Steven Rostedt # Cc: David Laight # Cc: Sergey Senozhatsky # Cc: Petr Mladek # Signed-off-by: Jason A. Donenfeld # Signed-off-by: Linus Torvalds # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 625d3449788f85569096780592549d0340e9c0c7 # < make -s -j 80 ARCH=powerpc O=/kisskb/build/linus_ppc6xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- ppc6xx_defconfig # < make -s -j 80 ARCH=powerpc O=/kisskb/build/linus_ppc6xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 80 ARCH=powerpc O=/kisskb/build/linus_ppc6xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 80 ARCH=powerpc O=/kisskb/build/linus_ppc6xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- /kisskb/src/block/genhd.c: In function 'diskstats_show': /kisskb/src/block/genhd.c:1623:1: warning: the frame size of 1160 bytes is larger than 1024 bytes [-Wframe-larger-than=] } ^ INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaddbc0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xacd4d8) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xacd4d8) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5249008 Bytes = 5125.98 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5248507 Bytes = 5125.50 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5216883 Bytes = 5094.61 KiB = 4.98 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5249675 Bytes = 5126.64 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00894 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5249283 Bytes = 5126.25 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00894 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5249427 Bytes = 5126.39 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5249682 Bytes = 5126.64 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5249362 Bytes = 5126.33 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.8.0-rc2+ Created: Mon Jun 22 20:18:32 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5248845 Bytes = 5125.83 KiB = 5.01 MiB Load Address: 00b00000 Entry Point: 00b00294 Completed OK # rm -rf /kisskb/build/linus_ppc6xx_defconfig_powerpc-gcc4.9 # Build took: 0:03:30.973326