mm/memory-failure: remove obsolete comment in unpoison_memory()

Since commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab fields to
allow larger rcu_head"), folio->_mapcount is not overloaded with SLAB.
Update corresponding comment.

Link: https://lkml.kernel.org/r/20240612071835.157004-10-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: kernel test robot <lkp@intel.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index bd3ab367ba2ff738483dc3c15863633df3c56e1e..bb8e79381c1f63bf81208799cf9142760abb98f0 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2584,10 +2584,6 @@ int unpoison_memory(unsigned long pfn)
            folio_test_reserved(folio) || folio_test_offline(folio))
                goto unlock_mutex;
 
-       /*
-        * Note that folio->_mapcount is overloaded in SLAB, so the simple test
-        * in folio_mapped() has to be done after folio_test_slab() is checked.
-        */
        if (folio_mapped(folio)) {
                unpoison_pr_info("Unpoison: Someone maps the hwpoison page %#lx\n",
                                 pfn, &unpoison_rs);