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>

6 files changed, 9 insertions, 9 deletions

diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 181be528c612..076052cd62be 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -126,8 +126,8 @@ static inline int pgd_large(pgd_t pgd) { return 0; }
 /* x86-64 always has all page tables mapped. */
 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
-#define pte_unmap(pte) /* NOP */
-#define pte_unmap_nested(pte) /* NOP */
+#define pte_unmap(pte) ((void)(pte))/* NOP */
+#define pte_unmap_nested(pte) ((void)(pte)) /* NOP */
 
 #define update_mmu_cache(vma, address, ptep) do { } while (0)
 
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 67460f010224..e3060ef85b6d 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -73,7 +73,11 @@ static inline void *kmap_atomic(struct page *page, enum km_type idx)
 }
 #define kmap_atomic_prot(page, idx, prot)       kmap_atomic(page, idx)
 
-#define kunmap_atomic_notypecheck(addr, idx)    do { pagefault_enable(); } while (0)
+static inline void kunmap_atomic_notypecheck(void *addr, enum km_type idx)
+{
+        pagefault_enable();
+}
+
 #define kmap_atomic_pfn(pfn, idx)       kmap_atomic(pfn_to_page(pfn), (idx))
 #define kmap_atomic_to_page(ptr)        virt_to_page(ptr)
 
diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index ee24ef8ab616..c04ecfe03f7f 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -4,7 +4,7 @@
 #ifdef CONFIG_DEBUG_VM
 #define VM_BUG_ON(cond) BUG_ON(cond)
 #else
-#define VM_BUG_ON(cond) do { } while (0)
+#define VM_BUG_ON(cond) do { (void)(cond); } while (0)
 #endif
 
 #ifdef CONFIG_DEBUG_VIRTUAL
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)