From: "Alex Xu (Hello71)" Subject: mm/smaps_rollup: return empty file for kthreads instead of ESRCH This restores the behavior prior to 258f669e7e88 ("mm: /proc/pid/smaps_rollup: convert to single value seq_file"), making it once again consistent with maps and smaps, and allowing patterns like awk '$1=="Anonymous:"{x+=$2}END{print x}' /proc/*/smaps_rollup to work. Searching all Debian packages for "smaps_rollup" did not find any programs which would be affected by this change. Link: https://lkml.kernel.org/r/20220413211357.26938-1-alex_y_xu@yahoo.ca Fixes: 258f669e7e88 ("mm: /proc/pid/smaps_rollup: convert to single value seq_file") Signed-off-by: Alex Xu (Hello71) Signed-off-by: Andrew Morton --- fs/proc/task_mmu.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/fs/proc/task_mmu.c~mm-smaps_rollup-return-empty-file-for-kthreads-instead-of-esrch +++ a/fs/proc/task_mmu.c @@ -883,10 +883,8 @@ static int show_smaps_rollup(struct seq_ return -ESRCH; mm = priv->mm; - if (!mm || !mmget_not_zero(mm)) { - ret = -ESRCH; + if (!mm || !mmget_not_zero(mm)) goto out_put_task; - } memset(&mss, 0, sizeof(mss)); _