The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 7013803444dd3bbbe28fd3360c084cec3057c554 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2026010519-jawline-playing-8c04@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7013803444dd3bbbe28fd3360c084cec3057c554 Mon Sep 17 00:00:00 2001 From: Kaushlendra Kumar kaushlendra.kumar@intel.com Date: Tue, 9 Dec 2025 10:15:52 +0530 Subject: [PATCH] tools/mm/page_owner_sort: fix timestamp comparison for stable sorting

The ternary operator in compare_ts() returns 1 when timestamps are equal, causing unstable sorting behavior. Replace with explicit three-way comparison that returns 0 for equal timestamps, ensuring stable qsort ordering and consistent output.

Link: https://lkml.kernel.org/r/20251209044552.3396468-1-kaushlendra.kumar@intel.c... Fixes: 8f9c447e2e2b ("tools/vm/page_owner_sort.c: support sorting pid and time") Signed-off-by: Kaushlendra Kumar kaushlendra.kumar@intel.com Cc: Chongxi Zhao zhaochongxi2019@email.szu.edu.cn Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org

diff --git a/tools/mm/page_owner_sort.c b/tools/mm/page_owner_sort.c index 14c67e9e84c4..e6954909401c 100644 --- a/tools/mm/page_owner_sort.c +++ b/tools/mm/page_owner_sort.c @@ -181,7 +181,11 @@ static int compare_ts(const void *p1, const void *p2) { const struct block_list *l1 = p1, *l2 = p2;

- return l1->ts_nsec < l2->ts_nsec ? -1 : 1; + if (l1->ts_nsec < l2->ts_nsec) + return -1; + if (l1->ts_nsec > l2->ts_nsec) + return 1; + return 0; }

static int compare_cull_condition(const void *p1, const void *p2)