+ mm-vmalloc-use-%p-for-pointer-formatting.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/vmalloc: Use %p for pointer formatting
has been added to the -mm mm-unstable branch.  Its filename is
     mm-vmalloc-use-%p-for-pointer-formatting.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-use-%p-for-pointer-formatting.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days

------------------------------------------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: mm/vmalloc: Use %p for pointer formatting
Date: Fri, 18 Sep 2026 12:50:13 +0200

Commit 45ec16908e84e ("mm: use %pK for /proc/vmallocinfo") introduced the
%pK in order not to leak kernel pointers.  Since commit ad67b74d2469d
("printk: hash addresses printed with %p") pointers are hashed by default
and the behaviour can be controller by `hash_pointers' boot argument.  The
policy on %p is to not introduce new ones.  Removing %pK makes it possible
to remove its handling from the library.

Looking at the output, having the pointer in the output makes it
possible to distinguish the individual entries.

Use %p instead %pK.

/proc/vmallocinfo has mode 0400, so this change doesn't make kernel
pointer information available to unprivileged userspace.

Link: https://lore.kernel.org/20260918105013.UpdykT6j@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Uladzislau Rezki <urezki@gmail.com>
---

 mm/vmalloc.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/mm/vmalloc.c~mm-vmalloc-use-%p-for-pointer-formatting
+++ a/mm/vmalloc.c
@@ -5316,7 +5316,7 @@ static void show_purge_info(struct seq_f
 	for_each_vmap_node(vn) {
 		spin_lock(&vn->lazy.lock);
 		list_for_each_entry(va, &vn->lazy.head, list) {
-			seq_printf(m, "0x%pK-0x%pK %7ld unpurged vm_area\n",
+			seq_printf(m, "0x%p-0x%p %7ld unpurged vm_area\n",
 				(void *)va->va_start, (void *)va->va_end,
 				va_size(va));
 		}
@@ -5339,7 +5339,7 @@ static int vmalloc_info_show(struct seq_
 		list_for_each_entry(va, &vn->busy.head, list) {
 			if (!va->vm) {
 				if (va->flags & VMAP_RAM)
-					seq_printf(m, "0x%pK-0x%pK %7ld vm_map_ram\n",
+					seq_printf(m, "0x%p-0x%p %7ld vm_map_ram\n",
 						(void *)va->va_start, (void *)va->va_end,
 						va_size(va));
 
@@ -5353,7 +5353,7 @@ static int vmalloc_info_show(struct seq_
 			/* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
 			smp_rmb();
 
-			seq_printf(m, "0x%pK-0x%pK %7ld",
+			seq_printf(m, "0x%p-0x%p %7ld",
 				v->addr, v->addr + v->size, v->size);
 
 			if (v->caller)
_

Patches currently in -mm which might be from bigeasy@linutronix.de are

mm-vmalloc-use-%p-for-pointer-formatting.patch