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mm: use folio_expected_ref_count() helper for reference counting

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Replace open-coded folio reference count calculations with the
folio_expected_ref_count().

No functional changes intended.

Link: https://lkml.kernel.org/r/20250611052706.515408-2-shivankg@amd.com
Signed-off-by: Shivank Garg <shivankg@amd.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Namhyung kim <namhyung@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Shivank Garg
2025-06-11 05:27:07 +00:00
committed by Andrew Morton
parent a788b6e571
commit a984f16fba
2 changed files with 2 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
kernel/events/uprobes.c
View File

@@ -436,8 +436,7 @@ static int __uprobe_write_opcode(struct vm_area_struct *vma,
* there are no unexpected folio references ...
*/
if (is_register || userfaultfd_missing(vma) ||
(folio_ref_count(folio) != folio_mapcount(folio) + 1 +
folio_test_swapcache(folio) * folio_nr_pages(folio)))
(folio_ref_count(folio) != folio_expected_ref_count(folio) + 1))
goto remap;
/*

3
mm/memfd.c
View File

@@ -32,8 +32,7 @@
static bool memfd_folio_has_extra_refs(struct folio *folio)
{
return folio_ref_count(folio) - folio_mapcount(folio) !=
folio_nr_pages(folio);
return folio_ref_count(folio) != folio_expected_ref_count(folio);
}
static void memfd_tag_pins(struct xa_state *xas)