linux-kernel - [PATCH 2/9] cgroup/cpuset-v1: Add deprecation warnings to memory_spread_page and memory_spread

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Message-ID: <20250304153801.597907-3-mkoutny@suse.com>
Date: Tue,  4 Mar 2025 16:37:54 +0100
From: Michal Koutný <mkoutny@...e.com>
To: cgroups@...r.kernel.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>,
	Josef Bacik <josef@...icpanda.com>,
	Jens Axboe <axboe@...nel.dk>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	Waiman Long <longman@...hat.com>
Subject: [PATCH 2/9] cgroup/cpuset-v1: Add deprecation warnings to memory_spread_page and memory_spread_slab

There is MPOL_INTERLEAVE for user explicit allocations.
Deprecate spreading of allocations that users carry out unwittingly.

Signed-off-by: Michal Koutný <mkoutny@...e.com>
---
 kernel/cgroup/cpuset-v1.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/cgroup/cpuset-v1.c b/kernel/cgroup/cpuset-v1.c
index 3e81ac76578c7..9aae6dabb0b56 100644
--- a/kernel/cgroup/cpuset-v1.c
+++ b/kernel/cgroup/cpuset-v1.c
@@ -441,9 +441,11 @@ static int cpuset_write_u64(struct cgroup_subsys_state *css, struct cftype *cft,
 		cpuset_memory_pressure_enabled = !!val;
 		break;
 	case FILE_SPREAD_PAGE:
+		pr_warn_once("cpuset.%s is deprecated\n", cft->name);
 		retval = cpuset_update_flag(CS_SPREAD_PAGE, cs, val);
 		break;
 	case FILE_SPREAD_SLAB:
+		pr_warn_once("cpuset.%s is deprecated\n", cft->name);
 		retval = cpuset_update_flag(CS_SPREAD_SLAB, cs, val);
 		break;
 	default:
-- 
2.48.1