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

[sfrench/cifs-2.6.git] / arch / x86 / mm / init_64.c

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 96d34ebb20a9e1e09e3a9e8eaf41f464a264d87e..e2942335d1437dc88747052208f34965dc0ef146 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/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