linux-kernel - [PATCH] alloc_tag: move memory_allocation_profiling

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Message-Id: <20251215-jag-alloc_tag_const-v1-1-35ea56a1ce13@kernel.org>
Date: Mon, 15 Dec 2025 16:47:37 +0100
From: Joel Granados <joel.granados@...nel.org>
To: Suren Baghdasaryan <surenb@...gle.com>, 
 Kent Overstreet <kent.overstreet@...ux.dev>, 
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
 Joel Granados <joel.granados@...nel.org>
Subject: [PATCH] alloc_tag: move memory_allocation_profiling_sysctls into
 .rodata

Remove the change in file mode permissions done before initializing the
sysctl. It is not necessary as the writing of the kernel variable will
be blocked by the proc_mem_profiling_handler when writing is disallowed
(also controlled by mem_profiling_support).

Signed-off-by: Joel Granados <joel.granados@...nel.org>
---
 lib/alloc_tag.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 27fee57a5c91db8067c05bff974a9e801e0ef6a0..846a5b5b44a4e5f530605c97a200e03260e73d77 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -783,7 +783,7 @@ static int proc_mem_profiling_handler(const struct ctl_table *table, int write,
 }
 
 
-static struct ctl_table memory_allocation_profiling_sysctls[] = {
+static const struct ctl_table memory_allocation_profiling_sysctls[] = {
 	{
 		.procname	= "mem_profiling",
 		.data		= &mem_alloc_profiling_key,
@@ -798,9 +798,6 @@ static struct ctl_table memory_allocation_profiling_sysctls[] = {
 
 static void __init sysctl_init(void)
 {
-	if (!mem_profiling_support)
-		memory_allocation_profiling_sysctls[0].mode = 0444;
-
 	register_sysctl_init("vm", memory_allocation_profiling_sysctls);
 }
 #else /* CONFIG_SYSCTL */

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251215-jag-alloc_tag_const-dc9d7c3f7a8f

Best regards,
-- 
Joel Granados <joel.granados@...nel.org>