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Date: Sat, 19 Jan 2008 07:48:34 +0100 (CET) From: Andi Kleen <ak@...e.de> To: mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org Subject: [PATCH] [6/8] Add an option to disable direct mapping gbpages and a global variable Signed-off-by: Andi Kleen <ak@...e.de> --- 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 @@ -248,6 +248,8 @@ static inline int pud_large(pud_t pte) #define update_mmu_cache(vma,address,pte) do { } while (0) +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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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