The patch titled
x86: implement pte_special
has been added to the -mm tree. Its filename is
x86-implement-pte_special.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: x86: implement pte_special
From: Nick Piggin <npiggin@xxxxxxx>
Implement the pte_special bit for x86. This is required to support
lockless get_user_pages, because we need to know whether or not we can
refcount a particular page given only its pte (and no vma).
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxx>
Cc: Badari Pulavarty <pbadari@xxxxxxxxxx>
Cc: Zach Brown <zach.brown@xxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-x86/pgtable.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN include/asm-x86/pgtable.h~x86-implement-pte_special include/asm-x86/pgtable.h
--- a/include/asm-x86/pgtable.h~x86-implement-pte_special
+++ a/include/asm-x86/pgtable.h
@@ -17,6 +17,7 @@
#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
#define _PAGE_BIT_UNUSED2 10
#define _PAGE_BIT_UNUSED3 11
+#define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
@@ -34,6 +35,8 @@
#define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
+#define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
+#define __HAVE_ARCH_PTE_SPECIAL
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
#define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
@@ -194,7 +197,7 @@ static inline int pte_exec(pte_t pte)
static inline int pte_special(pte_t pte)
{
- return 0;
+ return pte_val(pte) & _PAGE_SPECIAL;
}
static inline int pmd_large(pmd_t pte)
@@ -260,7 +263,7 @@ static inline pte_t pte_clrglobal(pte_t
static inline pte_t pte_mkspecial(pte_t pte)
{
- return pte;
+ return __pte(pte_val(pte) | _PAGE_SPECIAL);
}
extern pteval_t __supported_pte_mask;
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
hugetlb-fix-lockdep-error.patch
linux-next.patch
spufs-convert-nopfn-to-fault.patch
vt-fix-vc_resize-locking.patch
mspec-convert-nopfn-to-fault.patch
mspec-convert-nopfn-to-fault-fix.patch
mm-remove-nopfn.patch
mm-remove-double-indirection-on-tlb-parameter-to-free_pgd_range-co.patch
x86-implement-pte_special.patch
mm-introduce-get_user_pages_fast.patch
x86-lockless-get_user_pages_fast.patch
x86-lockless-get_user_pages_fast-fix.patch
x86-lockless-get_user_pages_fast-fix-warning.patch
dio-use-get_user_pages_fast.patch
splice-use-get_user_pages_fast.patch
reiser4.patch
likeliness-accounting-change-and-cleanup.patch
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