tlb: mmu_gather: Remove unused start/end arguments from tlb_finish_mmu()

Since commit 7a30df49f6 ("mm: mmu_gather: remove __tlb_reset_range()
for force flush"), the 'start' and 'end' arguments to tlb_finish_mmu()
are no longer used, since we flush the whole mm in case of a nested
invalidation.

Remove the unused arguments and update all callers.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Yu Zhao <yuzhao@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lkml.kernel.org/r/20210127235347.1402-3-will@kernel.org

arch/ia64/include/asm/tlb.h

@@ -36,7 +36,7 @@
  *	    tlb_end_vma(tlb, vma);
  *	  }
  *	}
- *	tlb_finish_mmu(tlb, start, end);	// finish unmap for address space MM
+ *	tlb_finish_mmu(tlb);				// finish unmap for address space MM
  */
 #include <linux/mm.h>
 #include <linux/pagemap.h>

arch/x86/kernel/ldt.c

@@ -400,7 +400,7 @@ static void free_ldt_pgtables(struct mm_struct *mm)
 
 	tlb_gather_mmu(&tlb, mm, start, end);
 	free_pgd_range(&tlb, start, end, start, end);
-	tlb_finish_mmu(&tlb, start, end);
+	tlb_finish_mmu(&tlb);
 #endif
 }
 

fs/exec.c

@@ -725,7 +725,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, unsigned long shift)
 		free_pgd_range(&tlb, old_start, old_end, new_end,
 			vma->vm_next ? vma->vm_next->vm_start : USER_PGTABLES_CEILING);
 	}
-	tlb_finish_mmu(&tlb, old_start, old_end);
+	tlb_finish_mmu(&tlb);
 
 	/*
 	 * Shrink the vma to just the new range.  Always succeeds.

include/linux/mm_types.h

@@ -590,8 +590,7 @@ static inline cpumask_t *mm_cpumask(struct mm_struct *mm)
 struct mmu_gather;
 extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
 				unsigned long start, unsigned long end);
-extern void tlb_finish_mmu(struct mmu_gather *tlb,
+extern void tlb_finish_mmu(struct mmu_gather *tlb);
-				unsigned long start, unsigned long end);
 
 static inline void init_tlb_flush_pending(struct mm_struct *mm)
 {

mm/hugetlb.c

@@ -3985,7 +3985,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
 
 	tlb_gather_mmu(&tlb, mm, tlb_start, tlb_end);
 	__unmap_hugepage_range(&tlb, vma, start, end, ref_page);
-	tlb_finish_mmu(&tlb, tlb_start, tlb_end);
+	tlb_finish_mmu(&tlb);
 }
 
 /*

mm/madvise.c

@@ -508,7 +508,7 @@ static long madvise_cold(struct vm_area_struct *vma,
 	lru_add_drain();
 	tlb_gather_mmu(&tlb, mm, start_addr, end_addr);
 	madvise_cold_page_range(&tlb, vma, start_addr, end_addr);
-	tlb_finish_mmu(&tlb, start_addr, end_addr);
+	tlb_finish_mmu(&tlb);
 
 	return 0;
 }
@@ -560,7 +560,7 @@ static long madvise_pageout(struct vm_area_struct *vma,
 	lru_add_drain();
 	tlb_gather_mmu(&tlb, mm, start_addr, end_addr);
 	madvise_pageout_page_range(&tlb, vma, start_addr, end_addr);
-	tlb_finish_mmu(&tlb, start_addr, end_addr);
+	tlb_finish_mmu(&tlb);
 
 	return 0;
 }
@@ -732,7 +732,7 @@ static int madvise_free_single_vma(struct vm_area_struct *vma,
 			&madvise_free_walk_ops, &tlb);
 	tlb_end_vma(&tlb, vma);
 	mmu_notifier_invalidate_range_end(&range);
-	tlb_finish_mmu(&tlb, range.start, range.end);
+	tlb_finish_mmu(&tlb);
 
 	return 0;
 }

mm/memory.c

@@ -1540,7 +1540,7 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
 	for ( ; vma && vma->vm_start < range.end; vma = vma->vm_next)
 		unmap_single_vma(&tlb, vma, start, range.end, NULL);
 	mmu_notifier_invalidate_range_end(&range);
-	tlb_finish_mmu(&tlb, start, range.end);
+	tlb_finish_mmu(&tlb);
 }
 
 /**
@@ -1566,7 +1566,7 @@ static void zap_page_range_single(struct vm_area_struct *vma, unsigned long addr
 	mmu_notifier_invalidate_range_start(&range);
 	unmap_single_vma(&tlb, vma, address, range.end, details);
 	mmu_notifier_invalidate_range_end(&range);
-	tlb_finish_mmu(&tlb, address, range.end);
+	tlb_finish_mmu(&tlb);
 }
 
 /**

mm/mmap.c

@@ -2676,7 +2676,7 @@ static void unmap_region(struct mm_struct *mm,
 	unmap_vmas(&tlb, vma, start, end);
 	free_pgtables(&tlb, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
 				 next ? next->vm_start : USER_PGTABLES_CEILING);
-	tlb_finish_mmu(&tlb, start, end);
+	tlb_finish_mmu(&tlb);
 }
 
 /*
@@ -3219,7 +3219,7 @@ void exit_mmap(struct mm_struct *mm)
 	/* Use -1 here to ensure all VMAs in the mm are unmapped */
 	unmap_vmas(&tlb, vma, 0, -1);
 	free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, USER_PGTABLES_CEILING);
-	tlb_finish_mmu(&tlb, 0, -1);
+	tlb_finish_mmu(&tlb);
 
 	/*
 	 * Walk the list again, actually closing and freeing it,

mm/mmu_gather.c

@@ -290,14 +290,11 @@ void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
 /**
  * tlb_finish_mmu - finish an mmu_gather structure
  * @tlb: the mmu_gather structure to finish
- * @start: start of the region that will be removed from the page-table
- * @end: end of the region that will be removed from the page-table
  *
  * Called at the end of the shootdown operation to free up any resources that
  * were required.
  */
-void tlb_finish_mmu(struct mmu_gather *tlb,
+void tlb_finish_mmu(struct mmu_gather *tlb)
-		unsigned long start, unsigned long end)
 {
 	/*
 	 * If there are parallel threads are doing PTE changes on same range

mm/oom_kill.c

@@ -548,13 +548,13 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
 						vma->vm_end);
 			tlb_gather_mmu(&tlb, mm, range.start, range.end);
 			if (mmu_notifier_invalidate_range_start_nonblock(&range)) {
-				tlb_finish_mmu(&tlb, range.start, range.end);
+				tlb_finish_mmu(&tlb);
 				ret = false;
 				continue;
 			}
 			unmap_page_range(&tlb, vma, range.start, range.end, NULL);
 			mmu_notifier_invalidate_range_end(&range);
-			tlb_finish_mmu(&tlb, range.start, range.end);
+			tlb_finish_mmu(&tlb);
 		}
 	}