[PATCH] freepgt: remove MM_VM_SIZE(mm)
There's only one usage of MM_VM_SIZE(mm) left, and it's a troublesome macro
because mm doesn't contain the (32-bit emulation?) info needed. But it too is
only needed because we ignore the end from the vma list.
We could make flush_pgtables return that end, or unmap_vmas. Choose the
latter, since it's a natural fit with unmap_mapping_range_vma needing to know
its restart addr. This does make more than minimal change, but if unmap_vmas
had returned the end before, this is how we'd have done it, rather than
storing the break_addr in zap_details.
unmap_vmas used to return count of vmas scanned, but that's just debug which
hasn't been useful in a while; and if we want the map_count 0 on exit check
back, it can easily come from the final remove_vm_struct loop.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/mmap.c b/mm/mmap.c
index 926d030..f8c61b2 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1900,6 +1900,7 @@
struct mmu_gather *tlb;
struct vm_area_struct *vma = mm->mmap;
unsigned long nr_accounted = 0;
+ unsigned long end;
lru_add_drain();
@@ -1908,10 +1909,10 @@
flush_cache_mm(mm);
tlb = tlb_gather_mmu(mm, 1);
/* Use -1 here to ensure all VMAs in the mm are unmapped */
- mm->map_count -= unmap_vmas(&tlb, mm, vma, 0, -1, &nr_accounted, NULL);
+ end = unmap_vmas(&tlb, mm, vma, 0, -1, &nr_accounted, NULL);
vm_unacct_memory(nr_accounted);
free_pgtables(&tlb, vma, 0, 0);
- tlb_finish_mmu(tlb, 0, MM_VM_SIZE(mm));
+ tlb_finish_mmu(tlb, 0, end);
mm->mmap = mm->mmap_cache = NULL;
mm->mm_rb = RB_ROOT;
@@ -1931,7 +1932,6 @@
vma = next;
}
- BUG_ON(mm->map_count); /* This is just debugging */
BUG_ON(mm->nr_ptes); /* This is just debugging */
}
