mm/shmem: remove unused entry_order after large swapin rework

After commit 93c0476e7057 ("mm/shmem, swap: rework swap entry and index
calculation for large swapin"), xas_get_order() will never return a
non-zero value for `entry_order` in shmem_split_large_entry().  As a
result, the local variable `entry_order` is effectively unused.

Clean up the code by removing `entry_order` and directly using
`cur_order`.  This change is purely a refactor and has no functional
impact.

No functional change intended.

Link: https://lkml.kernel.org/r/20250908062614.89880-1-liu.yun@linux.dev
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index c750bcae0ee361aba98368260ff58c6b42b1f41e..87005c086d5ad301ef83402b01cffb35d433b495 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2187,7 +2187,7 @@ static int shmem_split_large_entry(struct inode *inode, pgoff_t index,
 {
        struct address_space *mapping = inode->i_mapping;
        XA_STATE_ORDER(xas, &mapping->i_pages, index, 0);
-       int split_order = 0, entry_order;
+       int split_order = 0;
        int i;
 
        /* Convert user data gfp flags to xarray node gfp flags */
@@ -2205,15 +2205,12 @@ static int shmem_split_large_entry(struct inode *inode, pgoff_t index,
                        goto unlock;
                }
 
-               entry_order = xas_get_order(&xas);
-
-               if (!entry_order)
+               cur_order = xas_get_order(&xas);
+               if (!cur_order)
                        goto unlock;
 
                /* Try to split large swap entry in pagecache */
-               cur_order = entry_order;
-               swap_index = round_down(index, 1 << entry_order);
-
+               swap_index = round_down(index, 1 << cur_order);
                split_order = xas_try_split_min_order(cur_order);
 
                while (cur_order > 0) {