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authorCliff Wickman <cpw@sgi.com>2013-02-22 16:35:58 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:23 -0800
commitfa794199e36a13063913e75487001b3038316e51 (patch)
tree2b3b250e0706e40978a6b8611b49f276517271aa
parent240aadeedc4a89fc44623f8ce4ca46bda73db07e (diff)
downloadvexpress-lsk-fa794199e36a13063913e75487001b3038316e51.tar.gz
mm: export mmu notifier invalidates
We at SGI have a need to address some very high physical address ranges with our GRU (global reference unit), sometimes across partitioned machine boundaries and sometimes with larger addresses than the cpu supports. We do this with the aid of our own 'extended vma' module which mimics the vma. When something (either unmap or exit) frees an 'extended vma' we use the mmu notifiers to clean them up. We had been able to mimic the functions __mmu_notifier_invalidate_range_start() and __mmu_notifier_invalidate_range_end() by locking the per-mm lock and walking the per-mm notifier list. But with the change to a global srcu lock (static in mmu_notifier.c) we can no longer do that. Our module has no access to that lock. So we request that these two functions be exported. Signed-off-by: Cliff Wickman <cpw@sgi.com> Acked-by: Robin Holt <holt@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mmu_notifier.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index f5c3d968d8c..2175fb0d501 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -172,6 +172,7 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
}
srcu_read_unlock(&srcu, id);
}
+EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start);
void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
unsigned long start, unsigned long end)
@@ -187,6 +188,7 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
}
srcu_read_unlock(&srcu, id);
}
+EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_end);
static int do_mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm,