um/tlb: Convert to generic mmu_gather

Generic mmu_gather provides the simple flush_tlb_range() based range
tracking mmu_gather UM needs.

No change in behavior intended.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/um/include/asm/tlb.h b/arch/um/include/asm/tlb.h
index 6463f3a..70ee603 100644 (file)
--- a/arch/um/include/asm/tlb.h
+++ b/arch/um/include/asm/tlb.h
@@ -2,160 +2,8 @@
 #ifndef __UM_TLB_H
 #define __UM_TLB_H
 
-#include <linux/pagemap.h>
-#include <linux/swap.h>
-#include <asm/percpu.h>
-#include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
-
-#define tlb_start_vma(tlb, vma) do { } while (0)
-#define tlb_end_vma(tlb, vma) do { } while (0)
-#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
-
-/* struct mmu_gather is an opaque type used by the mm code for passing around
- * any data needed by arch specific code for tlb_remove_page.
- */
-struct mmu_gather {
-       struct mm_struct        *mm;
-       unsigned int            need_flush; /* Really unmapped some ptes? */
-       unsigned long           start;
-       unsigned long           end;
-       unsigned int            fullmm; /* non-zero means full mm flush */
-};
-
-static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
-                                         unsigned long address)
-{
-       if (tlb->start > address)
-               tlb->start = address;
-       if (tlb->end < address + PAGE_SIZE)
-               tlb->end = address + PAGE_SIZE;
-}
-
-static inline void init_tlb_gather(struct mmu_gather *tlb)
-{
-       tlb->need_flush = 0;
-
-       tlb->start = TASK_SIZE;
-       tlb->end = 0;
-
-       if (tlb->fullmm) {
-               tlb->start = 0;
-               tlb->end = TASK_SIZE;
-       }
-}
-
-static inline void
-arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
-               unsigned long start, unsigned long end)
-{
-       tlb->mm = mm;
-       tlb->start = start;
-       tlb->end = end;
-       tlb->fullmm = !(start | (end+1));
-
-       init_tlb_gather(tlb);
-}
-
-extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
-                              unsigned long end);
-
-static inline void
-tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
-{
-       flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
-}
-
-static inline void
-tlb_flush_mmu_free(struct mmu_gather *tlb)
-{
-       init_tlb_gather(tlb);
-}
-
-static inline void
-tlb_flush_mmu(struct mmu_gather *tlb)
-{
-       if (!tlb->need_flush)
-               return;
-
-       tlb_flush_mmu_tlbonly(tlb);
-       tlb_flush_mmu_free(tlb);
-}
-
-/* arch_tlb_finish_mmu
- *     Called at the end of the shootdown operation to free up any resources
- *     that were required.
- */
-static inline void
-arch_tlb_finish_mmu(struct mmu_gather *tlb,
-               unsigned long start, unsigned long end, bool force)
-{
-       if (force) {
-               tlb->start = start;
-               tlb->end = end;
-               tlb->need_flush = 1;
-       }
-       tlb_flush_mmu(tlb);
-
-       /* keep the page table cache within bounds */
-       check_pgt_cache();
-}
-
-/* tlb_remove_page
- *     Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
- *     while handling the additional races in SMP caused by other CPUs
- *     caching valid mappings in their TLBs.
- */
-static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
-{
-       tlb->need_flush = 1;
-       free_page_and_swap_cache(page);
-       return false; /* avoid calling tlb_flush_mmu */
-}
-
-static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
-{
-       __tlb_remove_page(tlb, page);
-}
-
-static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
-                                         struct page *page, int page_size)
-{
-       return __tlb_remove_page(tlb, page);
-}
-
-static inline void tlb_remove_page_size(struct mmu_gather *tlb,
-                                       struct page *page, int page_size)
-{
-       return tlb_remove_page(tlb, page);
-}
-
-/**
- * tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
- *
- * Record the fact that pte's were really umapped in ->need_flush, so we can
- * later optimise away the tlb invalidate.   This helps when userspace is
- * unmapping already-unmapped pages, which happens quite a lot.
- */
-#define tlb_remove_tlb_entry(tlb, ptep, address)               \
-       do {                                                    \
-               tlb->need_flush = 1;                            \
-               __tlb_remove_tlb_entry(tlb, ptep, address);     \
-       } while (0)
-
-#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address)       \
-       tlb_remove_tlb_entry(tlb, ptep, address)
-
-static inline void tlb_change_page_size(struct mmu_gather *tlb, unsigned int page_size)
-{
-}
-
-#define pte_free_tlb(tlb, ptep, addr) __pte_free_tlb(tlb, ptep, addr)
-
-#define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr)
-
-#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
-
-#define tlb_migrate_finish(mm) do {} while (0)
+#include <asm-generic/cacheflush.h>
+#include <asm-generic/tlb.h>
 
 #endif