From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 033D03176E4; Fri, 9 Jan 2026 12:18:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767961111; cv=none; b=jXp5Gfg3kvY0+UmLYaSTmyKMEBFP9rfvMPmDTJhMI5I6qyOX3Pz7K80mehGkAS7vjfx6Jgs4db0r3DC1b3caHNAlDtfZixaAKGrghFIEtylafewnt86hRz5MPEh+Z6sPdZgsv0se/J21GPYMBIVr0BBzppEnN74cvCxI6oRFLCI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767961111; c=relaxed/simple; bh=59g/XvlEuXOzlBNEiwAuQwiUmpbRlbYChDJgk4RJ5vA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QjAmSScIrlgm01n0/Q3w1FDiPHxKW/+DeqmLqNqQH+lY43IFLzI4lG0jCH1aratkJQflYcrbiGvN20W3NPnQ5znbYZzjiixFvbOI8LT1Cc+2J9VOEh5F7+w3uPe7cfZsfI8hvKuRhynUyMwWWISQJxiyDCp9zczNW7oDpVHLApY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=tDVpUwDk; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="tDVpUwDk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7B647C4CEF1; Fri, 9 Jan 2026 12:18:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767961110; bh=59g/XvlEuXOzlBNEiwAuQwiUmpbRlbYChDJgk4RJ5vA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tDVpUwDkBNucKG5iku9s7g/tPihHbqtcpCEQQVlHYIeiEWnbe+ZpKW0nOZRCtFzcv REoLNCej5J+OSn5Q3WYDXHJRTBsLwXqnJQun2NE2Jr3raHAB4sjpsYoH794tght2mY j/rbfXsAlNjKvVhEBFjFDE6ChvjAjkzoG9SiU7Iw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kaushlendra Kumar , Chongxi Zhao , Andrew Morton Subject: [PATCH 6.6 605/737] tools/mm/page_owner_sort: fix timestamp comparison for stable sorting Date: Fri, 9 Jan 2026 12:42:24 +0100 Message-ID: <20260109112156.764973928@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112133.973195406@linuxfoundation.org> References: <20260109112133.973195406@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kaushlendra Kumar commit 7013803444dd3bbbe28fd3360c084cec3057c554 upstream. 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.com Fixes: 8f9c447e2e2b ("tools/vm/page_owner_sort.c: support sorting pid and time") Signed-off-by: Kaushlendra Kumar Cc: Chongxi Zhao Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- tools/mm/page_owner_sort.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/tools/mm/page_owner_sort.c +++ b/tools/mm/page_owner_sort.c @@ -178,7 +178,11 @@ static int compare_ts(const void *p1, co { 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_free_ts(const void *p1, const void *p2)