Merge branch 'linus' into x86/bootmem

[cascardo/linux.git] / arch / x86 / kernel / setup.c

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d3cfe26..6b286d8 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -293,10 +293,32 @@ static void __init init_gbpages(void)
        else
                direct_gbpages = 0;
 }
+
+static void __init cleanup_highmap_brk_end(void)
+{
+       pud_t *pud;
+       pmd_t *pmd;
+
+       mmu_cr4_features = read_cr4();
+
+       /*
+        * _brk_end cannot change anymore, but it and _end may be
+        * located on different 2M pages. cleanup_highmap(), however,
+        * can only consider _end when it runs, so destroy any
+        * mappings beyond _brk_end here.
+        */
+       pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
+       pmd = pmd_offset(pud, _brk_end - 1);
+       while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
+               pmd_clear(pmd);
+}
 #else
 static inline void init_gbpages(void)
 {
 }
+static inline void cleanup_highmap_brk_end(void)
+{
+}
 #endif
 
 static void __init reserve_brk(void)
@@ -307,6 +329,8 @@ static void __init reserve_brk(void)
        /* Mark brk area as locked down and no longer taking any
           new allocations */
        _brk_start = 0;
+
+       cleanup_highmap_brk_end();
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -680,15 +704,6 @@ static int __init parse_reservelow(char *p)
 
 early_param("reservelow", parse_reservelow);
 
-static u64 __init get_max_mapped(void)
-{
-       u64 end = max_pfn_mapped;
-
-       end <<= PAGE_SHIFT;
-
-       return end;
-}
-
 /*
  * Determine if we were loaded by an EFI loader.  If so, then we have also been
  * passed the efi memmap, systab, etc., so we should use these data structures
@@ -950,14 +965,6 @@ void __init setup_arch(char **cmdline_p)
        max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
        max_pfn_mapped = max_low_pfn_mapped;
 
-#ifdef CONFIG_X86_64
-       if (max_pfn > max_low_pfn) {
-               max_pfn_mapped = init_memory_mapping(1UL<<32,
-                                                    max_pfn<<PAGE_SHIFT);
-               /* can we preseve max_low_pfn ?*/
-               max_low_pfn = max_pfn;
-       }
-#endif
        memblock.current_limit = get_max_mapped();
 
        /*