i386: pte simplify ops From: Zachary Amsden Add comment and condense code to make use of native_local_ptep_get_and_clear function. Also, it turns out the 2-level and 3-level paging definitions were identical, so move the common definition into pgtable.h Signed-off-by: Zachary Amsden Signed-off-by: Andrew Morton Signed-off-by: Andi Kleen --- include/asm-i386/pgtable-2level.h | 10 ---------- include/asm-i386/pgtable-3level.h | 10 ---------- include/asm-i386/pgtable.h | 17 +++++++++++++++-- 3 files changed, 15 insertions(+), 22 deletions(-) Index: linux/include/asm-i386/pgtable-2level.h =================================================================== --- linux.orig/include/asm-i386/pgtable-2level.h +++ linux/include/asm-i386/pgtable-2level.h @@ -41,16 +41,6 @@ static inline void native_pte_clear(stru *xp = __pte(0); } -/* local pte updates need not use xchg for locking */ -static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) -{ - pte_t res; - - res = *ptep; - native_pte_clear(NULL, 0, ptep); - return res; -} - #ifdef CONFIG_SMP static inline pte_t native_ptep_get_and_clear(pte_t *xp) { Index: linux/include/asm-i386/pgtable-3level.h =================================================================== --- linux.orig/include/asm-i386/pgtable-3level.h +++ linux/include/asm-i386/pgtable-3level.h @@ -139,16 +139,6 @@ static inline void pud_clear (pud_t * pu #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \ pmd_index(address)) -/* local pte updates need not use xchg for locking */ -static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) -{ - pte_t res; - - res = *ptep; - native_pte_clear(NULL, 0, ptep); - return res; -} - #ifdef CONFIG_SMP static inline pte_t native_ptep_get_and_clear(pte_t *ptep) { Index: linux/include/asm-i386/pgtable.h =================================================================== --- linux.orig/include/asm-i386/pgtable.h +++ linux/include/asm-i386/pgtable.h @@ -269,6 +269,16 @@ extern void vmalloc_sync_all(void); #define pte_update_defer(mm, addr, ptep) do { } while (0) #endif +/* local pte updates need not use xchg for locking */ +static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) +{ + pte_t res = *ptep; + + /* Pure native function needs no input for mm, addr */ + native_pte_clear(NULL, 0, ptep); + return res; +} + /* * We only update the dirty/accessed state if we set * the dirty bit by hand in the kernel, since the hardware @@ -343,8 +353,11 @@ static inline pte_t ptep_get_and_clear_f { pte_t pte; if (full) { - pte = *ptep; - native_pte_clear(mm, addr, ptep); + /* + * Full address destruction in progress; paravirt does not + * care about updates and native needs no locking + */ + pte = native_local_ptep_get_and_clear(ptep); } else { pte = ptep_get_and_clear(mm, addr, ptep); }