Buildresult: linus/um-defconfig/um-x86_64 built on Mar 7 2023, 10:32

kisskb

Revisions | Branches | Compilers | Configs | Build Results | Build Failures |

Status:	Failed
Date/Time:	Mar 7 2023, 10:32
Duration:	0:00:25.906467
Builder:	ka7
Revision:	cpumask: fix incorrect cpumask scanning result checks (`8ca09d5fa3549d142c2080a72a4c70ce389163cd)`
Target:	linus/um-defconfig/um-x86_64
Branch:	linus
Compiler:	um-x86_64 (x86_64-linux-gcc.br_real (Buildroot 2017.05) 5.4.0 / GNU ld (GNU Binutils) 2.27)
Config:	defconfig (download)
Log:	Download original Possible errors arch/um/os-Linux/util.c:17:24: fatal error: sys/random.h: No such file or directory make[3]: * [scripts/Makefile.build:252: arch/um/os-Linux/util.o] Error 1 make[2]: * [scripts/Makefile.build:494: arch/um/os-Linux] Error 2 make[1]: * [Makefile:2028: .] Error 2 make: * [Makefile:226: __sub-make] Error 2 No warnings found in log. Full Log # git rev-parse -q --verify 8ca09d5fa3549d142c2080a72a4c70ce389163cd^{commit} 8ca09d5fa3549d142c2080a72a4c70ce389163cd already have revision, skipping fetch # git checkout -q -f -B kisskb 8ca09d5fa3549d142c2080a72a4c70ce389163cd # git clean -qxdf # < git log -1 # commit 8ca09d5fa3549d142c2080a72a4c70ce389163cd # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Mon Mar 6 12:15:13 2023 -0800 # # cpumask: fix incorrect cpumask scanning result checks # # It turns out that commit 596ff4a09b89 ("cpumask: re-introduce # constant-sized cpumask optimizations") exposed a number of cases of # drivers not checking the result of "cpumask_next()" and friends # correctly. # # The documented correct check for "no more cpus in the cpumask" is to # check for the result being equal or larger than the number of possible # CPU ids, exactly _because_ we've always done those constant-sized # cpumask scans using a widened type before. So the return value of a # cpumask scan should be checked with # # if (cpu >= nr_cpu_ids) # ... # # because the cpumask scan did not necessarily stop exactly at that # maximum CPU id. # # But a few cases ended up instead using checks like # # if (cpu == nr_cpumask_bits) # ... # # which used that internal "widened" number of bits. And that used to # work pretty much by accident (ok, in this case "by accident" is simply # because it matched the historical internal implementation of the cpumask # scanning, so it was more of a "intentionally using implementation # details rather than an accident"). # # But the extended constant-sized optimizations then did that internal # implementation differently, and now that code that did things wrong but # matched the old implementation no longer worked at all. # # Which then causes subsequent odd problems due to using what ends up # being an invalid CPU ID. # # Most of these cases require either unusual hardware or special uses to # hit, but the random.c one triggers quite easily. # # All you really need is to have a sufficiently small CONFIG_NR_CPUS value # for the bit scanning optimization to be triggered, but not enough CPUs # to then actually fill that widened cpumask. At that point, the cpumask # scanning will return the NR_CPUS constant, which is _not_ the same as # nr_cpumask_bits. # # This just does the mindless fix with # # sed -i 's/== nr_cpumask_bits/>= nr_cpu_ids/' # # to fix the incorrect uses. # # The ones in the SCSI lpfc driver in particular could probably be fixed # more cleanly by just removing that repeated pattern entirely, but I am # not emptionally invested enough in that driver to care. # # Reported-and-tested-by: Guenter Roeck <linux@roeck-us.net> # Link: https://lore.kernel.org/lkml/481b19b5-83a0-4793-b4fd-194ad7b978c3@roeck-us.net/ # Reported-and-tested-by: Geert Uytterhoeven <geert+renesas@glider.be> # Link: https://lore.kernel.org/lkml/CAMuHMdUKo_Sf7TjKzcNDa8Ve+6QrK+P8nSQrSQ=6LTRmcBKNww@mail.gmail.com/ # Reported-by: Vernon Yang <vernon2gm@gmail.com> # Link: https://lore.kernel.org/lkml/20230306160651.2016767-1-vernon2gm@gmail.com/ # Cc: Yury Norov <yury.norov@gmail.com> # Cc: Jason A. Donenfeld <Jason@zx2c4.com> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 8ca09d5fa3549d142c2080a72a4c70ce389163cd # < make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 defconfig # < make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 help # make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig # make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 /kisskb/src/arch/um/os-Linux/util.c:17:24: fatal error: sys/random.h: No such file or directory compilation terminated. make[3]: * [/kisskb/src/scripts/Makefile.build:252: arch/um/os-Linux/util.o] Error 1 make[3]: * Waiting for unfinished jobs.... make[2]: * [/kisskb/src/scripts/Makefile.build:494: arch/um/os-Linux] Error 2 make[2]: * Waiting for unfinished jobs.... make[1]: * [/kisskb/src/Makefile:2028: .] Error 2 make: * [Makefile:226: __sub-make] Error 2 Command 'make -s -j 32 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 ' returned non-zero exit status 2 # rm -rf /kisskb/build/linus_um-defconfig_um-x86_64 # Build took: 0:00:25.906467

© Michael Ellerman 2006-2018.