Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
---
Documentation/x86_64/boot-options.txt | 3 +++
arch/x86/mm/init_64.c | 12 ++++++++++++
include/asm-x86/pgtable_64.h | 2 ++
3 files changed, 17 insertions(+)
Index: linux/arch/x86/mm/init_64.c
===================================================================
--- linux.orig/arch/x86/mm/init_64.c
+++ linux/arch/x86/mm/init_64.c
@@ -57,6 +57,18 @@ static unsigned long dma_reserve __initd
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+int direct_gbpages;
+
+static int __init parse_direct_gbpages(char *arg)
+{
+ if (!strcmp(arg, "off")) {
+ direct_gbpages = -1;
+ return 0;
+ }
+ return -1;
+}
+early_param("direct_gbpages", parse_direct_gbpages);
+
/*
* NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
* physical space so we can cache the place of the first one and move
Index: linux/include/asm-x86/pgtable_64.h
===================================================================
--- linux.orig/include/asm-x86/pgtable_64.h
+++ linux/include/asm-x86/pgtable_64.h
@@ -408,6 +408,8 @@ static inline pte_t pte_modify(pte_t pte
__changed; \
})
+extern int direct_gbpages;
+
/* Encode and de-code a swap entry */
#define __swp_type(x) (((x).val >> 1) & 0x3f)
#define __swp_offset(x) ((x).val >> 8)
Index: linux/Documentation/x86_64/boot-options.txt
===================================================================
--- linux.orig/Documentation/x86_64/boot-options.txt
+++ linux/Documentation/x86_64/boot-options.txt
@@ -307,3 +307,6 @@ Debugging
stuck (default)
Miscellaneous
+
+ direct_gbpages=off
+ Do not use GB pages for kernel direct mapping.
--
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