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authorAnders Roxell <anders.roxell@linaro.org>2019-03-07 16:30:16 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-07 18:32:02 -0800
commit1a6a1dbeb72fce7517665b365085ea405490c2d5 (patch)
treee485878f879abac0c03ab366352bfee1cfc2aa61 /kernel/configs
parent663cb6340c6e84fe29aa6d0fa63d85ea6bd6cd19 (diff)
lib/ubsan: default UBSAN_ALIGNMENT to not set
When booting an allmodconfig kernel, there are a lot of false-positives. With a message like this 'UBSAN: Undefined behaviour in...' with a call trace that follows. UBSAN warnings are a result of enabling noisy CONFIG_UBSAN_ALIGNMENT which is disabled by default if HAVE_EFFICIENT_UNALIGNED_ACCESS=y. It's noisy even if don't have efficient unaligned access, e.g. people often add __cacheline_aligned_in_smp in structs, but forget to align allocations of such struct (kmalloc() give 8-byte alignment in worst case). Rework so that when building a allmodconfig kernel that turns everything into '=m' or '=y' will turn off UBSAN_ALIGNMENT. [aryabinin@virtuozzo.com: changelog addition] Link: http://lkml.kernel.org/r/20181217150326.30933-1-anders.roxell@linaro.org Signed-off-by: Anders Roxell <anders.roxell@linaro.org> Suggested-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/configs')
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