[PATCH] mm: tlb_is_full_mm was obscure

tlb_is_full_mm?  What does that mean?  The TLB is full?  No, it means that the
mm's last user has gone and the whole mm is being torn down.  And it's an
inline function because sparc64 uses a different (slightly better)
"tlb_frozen" name for the flag others call "fullmm".

And now the ptep_get_and_clear_full macro used in zap_pte_range refers
directly to tlb->fullmm, which would be wrong for sparc64.  Rather than
correct that, I'd prefer to scrap tlb_is_full_mm altogether, and change
sparc64 to just use the same poor name as everyone else - is that okay?

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 9 deletions

diff --git a/include/asm-sparc64/tlb.h b/include/asm-sparc64/tlb.h
index 169309bdbf82..5d194eae870c 100644
--- a/include/asm-sparc64/tlb.h
+++ b/include/asm-sparc64/tlb.h
@@ -25,7 +25,7 @@ struct mmu_gather {
         struct mm_struct *mm;
         unsigned int pages_nr;
         unsigned int need_flush;
-        unsigned int tlb_frozen;
+        unsigned int fullmm;
         unsigned int tlb_nr;
         unsigned long freed;
         unsigned long vaddrs[TLB_BATCH_NR];
@@ -50,7 +50,7 @@ static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm, unsigned i
 
         mp->mm = mm;
         mp->pages_nr = num_online_cpus() > 1 ? 0U : ~0U;
-        mp->tlb_frozen = full_mm_flush;
+        mp->fullmm = full_mm_flush;
         mp->freed = 0;
 
         return mp;
@@ -88,10 +88,10 @@ static inline void tlb_finish_mmu(struct mmu_gather *mp, unsigned long start, un
 
         tlb_flush_mmu(mp);
 
-        if (mp->tlb_frozen) {
+        if (mp->fullmm) {
                 if (CTX_VALID(mm->context))
                         do_flush_tlb_mm(mm);
-                mp->tlb_frozen = 0;
+                mp->fullmm = 0;
         } else
                 flush_tlb_pending();
 
@@ -101,11 +101,6 @@ static inline void tlb_finish_mmu(struct mmu_gather *mp, unsigned long start, un
         put_cpu_var(mmu_gathers);
 }
 
-static inline unsigned int tlb_is_full_mm(struct mmu_gather *mp)
-{
-        return mp->tlb_frozen;
-}
-
 static inline void tlb_remove_page(struct mmu_gather *mp, struct page *page)
 {
         mp->need_flush = 1;