diff options
| -rw-r--r-- | arch/avr32/kernel/entry-avr32b.S | 42 | ||||
| -rw-r--r-- | include/asm-avr32/pgalloc.h | 14 |
2 files changed, 42 insertions, 14 deletions
diff --git a/arch/avr32/kernel/entry-avr32b.S b/arch/avr32/kernel/entry-avr32b.S index 3cdd7071f35..2b398cae110 100644 --- a/arch/avr32/kernel/entry-avr32b.S +++ b/arch/avr32/kernel/entry-avr32b.S @@ -98,10 +98,6 @@ tlb_miss_common: mfsr r0, SYSREG_TLBEAR mfsr r1, SYSREG_PTBR - /* Is it the vmalloc space? */ - bld r0, 31 - brcs handle_vmalloc_miss - /* * First level lookup: The PGD contains virtual pointers to * the second-level page tables, but they may be NULL if not @@ -143,15 +139,13 @@ pgtbl_lookup: tlbmiss_restore rete -handle_vmalloc_miss: - /* Simply do the lookup in init's page table */ - mov r1, lo(swapper_pg_dir) - orh r1, hi(swapper_pg_dir) - rjmp pgtbl_lookup - /* The slow path of the TLB miss handler */ .align 2 page_table_not_present: + /* Do we need to synchronize with swapper_pg_dir? */ + bld r0, 31 + brcs sync_with_swapper_pg_dir + page_not_present: tlbmiss_restore sub sp, 4 @@ -162,6 +156,34 @@ page_not_present: rcall do_page_fault rjmp ret_from_exception + .align 2 +sync_with_swapper_pg_dir: + /* + * If swapper_pg_dir contains a non-NULL second-level page + * table pointer, copy it into the current PGD. If not, we + * must handle it as a full-blown page fault. + * + * Jumping back to pgtbl_lookup causes an unnecessary lookup, + * but it is guaranteed to be a cache hit, it won't happen + * very often, and we absolutely do not want to sacrifice any + * performance in the fast path in order to improve this. + */ + mov r1, lo(swapper_pg_dir) + orh r1, hi(swapper_pg_dir) + ld.w r3, r1[r2 << 2] + cp.w r3, 0 + breq page_not_present + mfsr r1, SYSREG_PTBR + st.w r1[r2 << 2], r3 + rjmp pgtbl_lookup + + /* + * We currently have two bytes left at this point until we + * crash into the system call handler... + * + * Don't worry, the assembler will let us know. + */ + /* --- System Call --- */ diff --git a/include/asm-avr32/pgalloc.h b/include/asm-avr32/pgalloc.h index 5b768fc2388..e9636d1f383 100644 --- a/include/asm-avr32/pgalloc.h +++ b/include/asm-avr32/pgalloc.h @@ -9,8 +9,6 @@ #define __ASM_AVR32_PGALLOC_H #include <linux/mm.h> -#include <linux/sched.h> -#include <linux/slab.h> static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) @@ -30,12 +28,20 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, */ static inline pgd_t *pgd_alloc(struct mm_struct *mm) { - return kcalloc(USER_PTRS_PER_PGD, sizeof(pgd_t), GFP_KERNEL); + pgd_t *pgd; + + pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT); + if (likely(pgd)) + memcpy(pgd + USER_PTRS_PER_PGD, + swapper_pg_dir + USER_PTRS_PER_PGD, + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); + + return pgd; } static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) { - kfree(pgd); + free_page((unsigned long)pgd); } static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |