Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 3.18 01/13] mm/vmstat.c: assert that vmstat_text is in sync with stat_items_size | Date | Sun, 4 Nov 2018 08:54:21 -0500 |
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From: Jann Horn <jannh@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-jannh@google.com Signed-off-by: Jann Horn <jannh@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: Kemi Wang <kemi.wang@intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@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
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