mm/debug_page_alloc: improve error message for invalid guardpage minorder

When an invalid debug_guardpage_minorder value is provided, include the
user input in the error message.  This helps users and developers diagnose
configuration issues more easily.

No functional change.

Link: https://lkml.kernel.org/r/20250427100442.958352-3-ye.liu@linux.dev
Signed-off-by: Ye Liu <liuye@kylinos.cn>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/debug_page_alloc.c b/mm/debug_page_alloc.c
index d46acf989dde88cda624bb47c5cf107ff6e756fb..6a26eca546c3372c2d7209dc2e506204e0cee691 100644 (file)
--- a/mm/debug_page_alloc.c
+++ b/mm/debug_page_alloc.c
@@ -23,7 +23,7 @@ static int __init debug_guardpage_minorder_setup(char *buf)
        unsigned long res;
 
        if (kstrtoul(buf, 10, &res) < 0 ||  res > MAX_PAGE_ORDER / 2) {
-               pr_err("Bad debug_guardpage_minorder value\n");
+               pr_err("Bad debug_guardpage_minorder value: %s\n", buf);
                return 0;
        }
        _debug_guardpage_minorder = res;