mm/page_alloc: remove unnecessary __maybe_unused in order_to_pindex()

The `movable` variable is always used when `CONFIG_TRANSPARENT_HUGEPAGE`
is enabled, so the `__maybe_unused` attribute is not necessary.  This
patch removes it and keeps the variable declaration within the `#ifdef`
block for better clarity.

Link: https://lkml.kernel.org/r/20250319091726.401158-1-liuyerd@163.com
Signed-off-by: Liu Ye<liuye@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a6d060eea638065eea19c50fcc929d55b6950a2f..0c01998cb3a03884f75be3a1c9d44b20d27f9f23 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -509,9 +509,9 @@ out:
 
 static inline unsigned int order_to_pindex(int migratetype, int order)
 {
-       bool __maybe_unused movable;
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
+       bool movable;
        if (order > PAGE_ALLOC_COSTLY_ORDER) {
                VM_BUG_ON(order != HPAGE_PMD_ORDER);