x86/mm: Fix marking of unused sub-pmd ranges

The unused part precedes the new range spanned by the start, end parameters
of vmemmap_use_new_sub_pmd(). This means it actually goes from
ALIGN_DOWN(start, PMD_SIZE) up to start.

Use the correct address when applying the mark using memset.

Fixes: 8d40091 ("x86/vmemmap: handle unpopulated sub-pmd ranges")
Signed-off-by: Adrian-Ken Rueegsegger <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Oscar Salvador <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]

arch/x86/mm/init_64.c

@@ -902,6 +902,8 @@ static void __meminit vmemmap_use_sub_pmd(unsigned long start, unsigned long end
 
 static void __meminit vmemmap_use_new_sub_pmd(unsigned long start, unsigned long end)
 {
+ const unsigned long page = ALIGN_DOWN(start, PMD_SIZE);
+
  vmemmap_flush_unused_pmd();
 
  /*
@@ -914,8 +916,7 @@ static void __meminit vmemmap_use_new_sub_pmd(unsigned long start, unsigned long
  * Mark with PAGE_UNUSED the unused parts of the new memmap range
  */
  if (!IS_ALIGNED(start, PMD_SIZE))
- memset((void *)start, PAGE_UNUSED,
- start - ALIGN_DOWN(start, PMD_SIZE));
+ memset((void *)page, PAGE_UNUSED, start - page);
 
  /*
  * We want to avoid memset(PAGE_UNUSED) when populating the vmemmap of