On Tue, 31 Oct 2017, Dave Hansen wrote: > --- a/arch/x86/include/asm/pgtable_types.h~kaiser-prep-disable-global-pages 2017-10-31 15:03:49.314064402 -0700 > +++ b/arch/x86/include/asm/pgtable_types.h 2017-10-31 15:03:49.323064827 -0700 > @@ -47,7 +47,12 @@ > #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED) > #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY) > #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE) > +#ifdef CONFIG_X86_GLOBAL_PAGES > #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL) > +#else > +/* We must ensure that kernel TLBs are unusable while in userspace */ > +#define _PAGE_GLOBAL (_AT(pteval_t, 0)) > +#endif What you really want to do here is to clear PAGE_GLOBAL in the supported_pte_mask. probe_page_size_mask() is the proper place for that. This allows both .config and boottime configuration. Thanks, tglx -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
