On Wed, Nov 15, 2023 at 9:34 PM Ilya Leoshkevich <iii@xxxxxxxxxxxxx> wrote: > > On s390 the virtual address 0 is valid (current CPU's lowcore is mapped > there), therefore KMSAN should not complain about it. > > Disable the respective check on s390. There doesn't seem to be a > Kconfig option to describe this situation, so explicitly check for > s390. > > Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx> Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx> (see the nit below) > --- > mm/kmsan/init.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/mm/kmsan/init.c b/mm/kmsan/init.c > index ffedf4dbc49d..14f4a432fddd 100644 > --- a/mm/kmsan/init.c > +++ b/mm/kmsan/init.c > @@ -33,7 +33,9 @@ static void __init kmsan_record_future_shadow_range(void *start, void *end) > bool merged = false; > > KMSAN_WARN_ON(future_index == NUM_FUTURE_RANGES); > - KMSAN_WARN_ON((nstart >= nend) || !nstart || !nend); > + KMSAN_WARN_ON((nstart >= nend) || > + (!IS_ENABLED(CONFIG_S390) && !nstart) || Please add a comment explaining this bit. > + !nend); > nstart = ALIGN_DOWN(nstart, PAGE_SIZE); > nend = ALIGN(nend, PAGE_SIZE); > > -- > 2.41.0 >
