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authorGreg Kroah-Hartman <gregkh@suse.de>2011-04-11 16:06:59 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-14 16:53:11 -0700
commit98eec152c36e9544a81fa709d0eb2cf028cf4cdb (patch)
tree81ca0c955457b887329c2b03bf1dcd83988e5b73
parent3dcb7a9e819d6f61cf778a43cde1cb3c689f34de (diff)
downloadlinux-linaro-stable-98eec152c36e9544a81fa709d0eb2cf028cf4cdb.tar.gz
Revert "x86: Cleanup highmap after brk is concluded"
This reverts upstream commit e5f15b45ddf3afa2bbbb10c7ea34fb32b6de0a0e It caused problems in the stable tree and should not have been there. Cc: Yinghai Lu <yinghai@kernel.org> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--arch/x86/kernel/head64.c3
-rw-r--r--arch/x86/kernel/setup.c5
-rw-r--r--arch/x86/mm/init.c19
-rw-r--r--arch/x86/mm/init_64.c11
4 files changed, 27 insertions, 11 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 9ea4f8130ba8..b5a9896ca1e7 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -76,6 +76,9 @@ void __init x86_64_start_kernel(char * real_mode_data)
/* Make NULL pointers segfault */
zap_identity_mappings();
+ /* Cleanup the over mapped high alias */
+ cleanup_highmap();
+
for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
#ifdef CONFIG_EARLY_PRINTK
set_intr_gate(i, &early_idt_handlers[i]);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 45fd3d06eec4..92435869e170 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -295,9 +295,6 @@ static void __init init_gbpages(void)
static inline void init_gbpages(void)
{
}
-static void __init cleanup_highmap(void)
-{
-}
#endif
static void __init reserve_brk(void)
@@ -898,8 +895,6 @@ void __init setup_arch(char **cmdline_p)
reserve_brk();
- cleanup_highmap();
-
/*
* Find and reserve possible boot-time SMP configuration:
*/
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index e7e432f7684b..d406c5239019 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -283,6 +283,25 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
load_cr3(swapper_pg_dir);
#endif
+#ifdef CONFIG_X86_64
+ if (!after_bootmem && !start) {
+ 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);
+ }
+#endif
__flush_tlb_all();
if (!after_bootmem && e820_table_end > e820_table_start)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 19c9ed44eb11..69ddfbd91135 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -49,7 +49,6 @@
#include <asm/numa.h>
#include <asm/cacheflush.h>
#include <asm/init.h>
-#include <asm/setup.h>
#include <linux/bootmem.h>
static unsigned long dma_reserve __initdata;
@@ -258,18 +257,18 @@ void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
* to the compile time generated pmds. This results in invalid pmds up
* to the point where we hit the physaddr 0 mapping.
*
- * We limit the mappings to the region from _text to _brk_end. _brk_end
- * is rounded up to the 2MB boundary. This catches the invalid pmds as
+ * We limit the mappings to the region from _text to _end. _end is
+ * rounded up to the 2MB boundary. This catches the invalid pmds as
* well, as they are located before _text:
*/
void __init cleanup_highmap(void)
{
unsigned long vaddr = __START_KERNEL_map;
- unsigned long vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
- unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
+ unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
pmd_t *pmd = level2_kernel_pgt;
+ pmd_t *last_pmd = pmd + PTRS_PER_PMD;
- for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
+ for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
if (pmd_none(*pmd))
continue;
if (vaddr < (unsigned long) _text || vaddr > end)