# 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 # 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 # Link: https://lore.kernel.org/lkml/481b19b5-83a0-4793-b4fd-194ad7b978c3@roeck-us.net/ # Reported-and-tested-by: Geert Uytterhoeven # Link: https://lore.kernel.org/lkml/CAMuHMdUKo_Sf7TjKzcNDa8Ve+6QrK+P8nSQrSQ=6LTRmcBKNww@mail.gmail.com/ # Reported-by: Vernon Yang # Link: https://lore.kernel.org/lkml/20230306160651.2016767-1-vernon2gm@gmail.com/ # Cc: Yury Norov # Cc: Jason A. Donenfeld # Signed-off-by: Linus Torvalds # < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/mips-linux/bin/mips-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/mips-linux/bin/mips-linux-ld --version # < git log --format=%s --max-count=1 8ca09d5fa3549d142c2080a72a4c70ce389163cd # < make -s -j 160 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/mips-linux/bin/mips-linux- allnoconfig # < make -s -j 160 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/mips-linux/bin/mips-linux- help # make -s -j 160 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/mips-linux/bin/mips-linux- olddefconfig # make -s -j 160 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/mips-linux/bin/mips-linux- Completed OK # rm -rf /kisskb/build/linus_mips-allnoconfig_mips-gcc11 # Build took: 0:00:44.563533