gcc-4.6: mm: fix unused but set warnings

No real bugs, just some dead code and some fixups.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 1 insertions, 5 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 20e5642e9f9f..3d4df44e4221 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2238,14 +2238,12 @@ static ssize_t generic_perform_write(struct file *file,
 
         do {
                 struct page *page;
-                pgoff_t index;          /* Pagecache index for current page */
                 unsigned long offset;   /* Offset into pagecache page */
                 unsigned long bytes;    /* Bytes to write to page */
                 size_t copied;          /* Bytes copied from user */
                 void *fsdata;
 
                 offset = (pos & (PAGE_CACHE_SIZE - 1));
-                index = pos >> PAGE_CACHE_SHIFT;
                 bytes = min_t(unsigned long, PAGE_CACHE_SIZE - offset,
                                                 iov_iter_count(i));
 
diff --git a/mm/memory.c b/mm/memory.c
index bde42c6d3633..6b0c37dcfd16 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -307,7 +307,6 @@ void free_pgd_range(struct mmu_gather *tlb,
 {
         pgd_t *pgd;
         unsigned long next;
-        unsigned long start;
 
         /*
          * The next few lines have given us lots of grief...
@@ -351,7 +350,6 @@ void free_pgd_range(struct mmu_gather *tlb,
         if (addr > end - 1)
                 return;
 
-        start = addr;
         pgd = pgd_offset(tlb->mm, addr);
         do {
                 next = pgd_addr_end(addr, end);
diff --git a/mm/slab.c b/mm/slab.c
index 736e497733d6..88435fcc8387 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -394,7 +394,7 @@ static void kmem_list3_init(struct kmem_list3 *parent)
 #define STATS_DEC_ACTIVE(x)     do { } while (0)
 #define STATS_INC_ALLOCED(x)    do { } while (0)
 #define STATS_INC_GROWN(x)      do { } while (0)
-#define STATS_ADD_REAPED(x,y)   do { } while (0)
+#define STATS_ADD_REAPED(x,y)   do { (void)(y); } while (0)
 #define STATS_SET_HIGH(x)       do { } while (0)
 #define STATS_INC_ERR(x)        do { } while (0)
 #define STATS_INC_NODEALLOCS(x) do { } while (0)