From: Eric Dumazet <edumazet@xxxxxxxxxx> Subject: mm/vmalloc: make sure to dump unpurged areas in /proc/vmallocinfo If last va found in vmap_area_list does not have a vm pointer, vmallocinfo.s_show() returns 0, and show_purge_info() is not called as it should. Link: https://lkml.kernel.org/r/20211001170815.73321-1-eric.dumazet@xxxxxxxxx Fixes: dd3b8353bae7 ("mm/vmalloc: do not keep unpurged areas in the busy tree") Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx> Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx> Cc: Pengfei Li <lpf.vector@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/vmalloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/mm/vmalloc.c~mm-vmalloc-make-sure-to-dump-unpurged-areas-in-proc-vmallocinfo +++ a/mm/vmalloc.c @@ -3913,7 +3913,7 @@ static int s_show(struct seq_file *m, vo (void *)va->va_start, (void *)va->va_end, va->va_end - va->va_start); - return 0; + goto final; } v = va->vm; @@ -3954,6 +3954,7 @@ static int s_show(struct seq_file *m, vo /* * As a final step, dump "unpurged" areas. */ +final: if (list_is_last(&va->list, &vmap_area_list)) show_purge_info(m); _
