From: Jann Horn <ja...@google.com> [ Upstream commit f0ecf25a093fc0589f0a6bc4c1ea068bbb67d220 ]
Having two gigantic arrays that must manually be kept in sync, including ifdefs, isn't exactly robust. To make it easier to catch such issues in the future, add a BUILD_BUG_ON(). Link: http://lkml.kernel.org/r/20181001143138.95119-3-ja...@google.com Signed-off-by: Jann Horn <ja...@google.com> Reviewed-by: Kees Cook <keesc...@chromium.org> Reviewed-by: Andrew Morton <a...@linux-foundation.org> Acked-by: Roman Gushchin <g...@fb.com> Acked-by: Michal Hocko <mho...@suse.com> Cc: Davidlohr Bueso <d...@stgolabs.net> Cc: Oleg Nesterov <o...@redhat.com> Cc: Christoph Lameter <clame...@sgi.com> Cc: Kemi Wang <kemi.w...@intel.com> Cc: Andy Lutomirski <l...@kernel.org> Cc: Ingo Molnar <mi...@kernel.org> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> Signed-off-by: Sasha Levin <sas...@kernel.org> --- mm/vmstat.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/vmstat.c b/mm/vmstat.c index 4590aa42b6cd..792374f7088f 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1189,6 +1189,8 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos) stat_items_size += sizeof(struct vm_event_state); #endif + BUILD_BUG_ON(stat_items_size != + ARRAY_SIZE(vmstat_text) * sizeof(unsigned long)); v = kmalloc(stat_items_size, GFP_KERNEL); m->private = v; if (!v) -- 2.17.1
