On Thu 01-11-18 13:09:16, Konstantin Khlebnikov wrote: > Allocations over KMALLOC_MAX_SIZE could be served only by vmalloc.
I would go on and say that allocations with sizes too large can actually trigger a warning (once you have posted in the previous version outside of the changelog area) because that might be interesting to people - there are deployments to panic on warning and then a warning is much more important. > Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru> Acked-by: Michal Hocko <mho...@suse.com> Thanks! > --- > mm/util.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/mm/util.c b/mm/util.c > index 8bf08b5b5760..f5f04fa22814 100644 > --- a/mm/util.c > +++ b/mm/util.c > @@ -392,6 +392,9 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node) > gfp_t kmalloc_flags = flags; > void *ret; > > + if (size > KMALLOC_MAX_SIZE) > + goto fallback; > + > /* > * vmalloc uses GFP_KERNEL for some internal allocations (e.g page > tables) > * so the given set of flags has to be compatible. > @@ -422,6 +425,7 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node) > if (ret || size <= PAGE_SIZE) > return ret; > > +fallback: > return __vmalloc_node_flags_caller(size, node, flags, > __builtin_return_address(0)); > } > -- Michal Hocko SUSE Labs
