releases/5.0.10/percpu-stop-printing-kernel-addresses.patch

   1 From 00206a69ee32f03e6f40837684dcbe475ea02266 Mon Sep 17 00:00:00 2001
   2 From: Matteo Croce <mcroce@redhat.com>
   3 Date: Mon, 18 Mar 2019 02:32:36 +0100
   4 Subject: percpu: stop printing kernel addresses
   5
   6 From: Matteo Croce <mcroce@redhat.com>
   7
   8 commit 00206a69ee32f03e6f40837684dcbe475ea02266 upstream.
   9
  10 Since commit ad67b74d2469d9b8 ("printk: hash addresses printed with %p"),
  11 at boot "____ptrval____" is printed instead of actual addresses:
  12
  13     percpu: Embedded 38 pages/cpu @(____ptrval____) s124376 r0 d31272 u524288
  14
  15 Instead of changing the print to "%px", and leaking kernel addresses,
  16 just remove the print completely, cfr. e.g. commit 071929dbdd865f77
  17 ("arm64: Stop printing the virtual memory layout").
  18
  19 Signed-off-by: Matteo Croce <mcroce@redhat.com>
  20 Signed-off-by: Dennis Zhou <dennis@kernel.org>
  21 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  22
  23 ---
  24  mm/percpu.c |    8 ++++----
  25  1 file changed, 4 insertions(+), 4 deletions(-)
  26
  27 --- a/mm/percpu.c
  28 +++ b/mm/percpu.c
  29 @@ -2531,8 +2531,8 @@ int __init pcpu_embed_first_chunk(size_t
  30                 ai->groups[group].base_offset = areas[group] - base;
  31         }
  32
  33 -       pr_info("Embedded %zu pages/cpu @%p s%zu r%zu d%zu u%zu\n",
  34 -               PFN_DOWN(size_sum), base, ai->static_size, ai->reserved_size,
  35 +       pr_info("Embedded %zu pages/cpu s%zu r%zu d%zu u%zu\n",
  36 +               PFN_DOWN(size_sum), ai->static_size, ai->reserved_size,
  37                 ai->dyn_size, ai->unit_size);
  38
  39         rc = pcpu_setup_first_chunk(ai, base);
  40 @@ -2653,8 +2653,8 @@ int __init pcpu_page_first_chunk(size_t
  41         }
  42
  43         /* we're ready, commit */
  44 -       pr_info("%d %s pages/cpu @%p s%zu r%zu d%zu\n",
  45 -               unit_pages, psize_str, vm.addr, ai->static_size,
  46 +       pr_info("%d %s pages/cpu s%zu r%zu d%zu\n",
  47 +               unit_pages, psize_str, ai->static_size,
  48                 ai->reserved_size, ai->dyn_size);
  49
  50         rc = pcpu_setup_first_chunk(ai, vm.addr);