mm/damon/paddr: initialize 'folio' variables to NULL for clarity

In damon_pa_mark_accessed_or_deactivate(), damon_pa_pageout(),
damon_pa_migrate(), and damon_pa_stat(), the local variable 'folio' is
declared but not initialized.

Initialize 'folio' to NULL to improve code readability and
maintainability.

Link: https://patch.msgid.link/20260104013255.16962-1-yangqixiao@inspur.com
Link: https://lkml.kernel.org/r/20260108013041.80601-1-sj@kernel.org
Signed-off-by: Aaron Yang <yangqixiao@inspur.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 07a8aead439eb1e62fe67e6681f0ce781a971701..7d887a3c08665cfeaad67b4e9694548441d22daf 100644 (file)
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -156,7 +156,7 @@ static unsigned long damon_pa_pageout(struct damon_region *r,
        LIST_HEAD(folio_list);
        bool install_young_filter = true;
        struct damos_filter *filter;
-       struct folio *folio;
+       struct folio *folio = NULL;
 
        /* check access in page level again by default */
        damos_for_each_ops_filter(filter, s) {
@@ -212,7 +212,7 @@ static inline unsigned long damon_pa_mark_accessed_or_deactivate(
                unsigned long *sz_filter_passed)
 {
        phys_addr_t addr, applied = 0;
-       struct folio *folio;
+       struct folio *folio = NULL;
 
        addr = damon_pa_phys_addr(r->ar.start, addr_unit);
        while (addr < damon_pa_phys_addr(r->ar.end, addr_unit)) {
@@ -262,7 +262,7 @@ static unsigned long damon_pa_migrate(struct damon_region *r,
 {
        phys_addr_t addr, applied;
        LIST_HEAD(folio_list);
-       struct folio *folio;
+       struct folio *folio = NULL;
 
        addr = damon_pa_phys_addr(r->ar.start, addr_unit);
        while (addr < damon_pa_phys_addr(r->ar.end, addr_unit)) {
@@ -295,7 +295,7 @@ static unsigned long damon_pa_stat(struct damon_region *r,
                unsigned long *sz_filter_passed)
 {
        phys_addr_t addr;
-       struct folio *folio;
+       struct folio *folio = NULL;
 
        if (!damos_ops_has_filter(s))
                return 0;