Update from upstream with manual merge of Yasunori Goto's

changes to swiotlb.c made in commit 281dd25cdc0d6903929b79183816d151ea626341
since this file has been moved from arch/ia64/lib/swiotlb.c to
lib/swiotlb.c

Signed-off-by: Tony Luck <tony.luck@intel.com>

7 files changed, 47 insertions, 6 deletions

diff --git a/lib/.gitignore b/lib/.gitignore
new file mode 100644
index 00000000000..3bef1ea94c9
--- /dev/null
+++ b/lib/.gitignore
@@ -0,0 +1,6 @@
+#
+# Generated files
+#
+gen_crc32table
+crc32table.h
+
diff --git a/lib/dec_and_lock.c b/lib/dec_and_lock.c
index 2377af057d0..305a9663aee 100644
--- a/lib/dec_and_lock.c
+++ b/lib/dec_and_lock.c
@@ -1,7 +1,41 @@
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <asm/atomic.h>
+#include <asm/system.h>
 
+#ifdef __HAVE_ARCH_CMPXCHG
+/*
+ * This is an implementation of the notion of "decrement a
+ * reference count, and return locked if it decremented to zero".
+ *
+ * This implementation can be used on any architecture that
+ * has a cmpxchg, and where atomic->value is an int holding
+ * the value of the atomic (i.e. the high bits aren't used
+ * for a lock or anything like that).
+ */
+int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
+{
+        int counter;
+        int newcount;
+
+        for (;;) {
+                counter = atomic_read(atomic);
+                newcount = counter - 1;
+                if (!newcount)
+                        break;          /* do it the slow way */
+
+                newcount = cmpxchg(&atomic->counter, counter, newcount);
+                if (newcount == counter)
+                        return 0;
+        }
+
+        spin_lock(lock);
+        if (atomic_dec_and_test(atomic))
+                return 1;
+        spin_unlock(lock);
+        return 0;
+}
+#else
 /*
  * This is an architecture-neutral, but slow,
  * implementation of the notion of "decrement
@@ -33,5 +67,6 @@ int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
         spin_unlock(lock);
         return 0;
 }
+#endif
 
 EXPORT_SYMBOL(_atomic_dec_and_lock);
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 6a8bc6e0643..d1c057e71b6 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -110,7 +110,7 @@ radix_tree_node_free(struct radix_tree_node *node)
  * success, return zero, with preemption disabled.  On error, return -ENOMEM
  * with preemption not disabled.
  */
-int radix_tree_preload(unsigned int __nocast gfp_mask)
+int radix_tree_preload(gfp_t gfp_mask)
 {
         struct radix_tree_preload *rtp;
         struct radix_tree_node *node;
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index c2fc470b6ed..5bdeaaea57f 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -142,8 +142,8 @@ swiotlb_init_with_default_size (size_t default_size)
         /*
          * Get IO TLB memory from the low pages
          */
-        io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs *
-                                               (1 << IO_TLB_SHIFT));
+        io_tlb_start = alloc_bootmem_low_pages_limit(io_tlb_nslabs *
+                                             (1 << IO_TLB_SHIFT), 0x100000000);
         if (!io_tlb_start)
                 panic("Cannot allocate SWIOTLB buffer");
         io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT);
diff --git a/lib/ts_bm.c b/lib/ts_bm.c
index 2cc79112ecc..8a8b3a16133 100644
--- a/lib/ts_bm.c
+++ b/lib/ts_bm.c
@@ -127,7 +127,7 @@ static void compute_prefix_tbl(struct ts_bm *bm, const u8 *pattern,
 }
 
 static struct ts_config *bm_init(const void *pattern, unsigned int len,
-                                 int gfp_mask)
+                                 gfp_t gfp_mask)
 {
         struct ts_config *conf;
         struct ts_bm *bm;
diff --git a/lib/ts_fsm.c b/lib/ts_fsm.c
index d27c0a07294..ca3211206ee 100644
--- a/lib/ts_fsm.c
+++ b/lib/ts_fsm.c
@@ -258,7 +258,7 @@ found_match:
 }
 
 static struct ts_config *fsm_init(const void *pattern, unsigned int len,
-                                     int gfp_mask)
+                                     gfp_t gfp_mask)
 {
         int i, err = -EINVAL;
         struct ts_config *conf;
diff --git a/lib/ts_kmp.c b/lib/ts_kmp.c
index 73266b97558..7fd45451b44 100644
--- a/lib/ts_kmp.c
+++ b/lib/ts_kmp.c
@@ -87,7 +87,7 @@ static inline void compute_prefix_tbl(const u8 *pattern, unsigned int len,
 }
 
 static struct ts_config *kmp_init(const void *pattern, unsigned int len,
-                                  int gfp_mask)
+                                  gfp_t gfp_mask)
 {
         struct ts_config *conf;
         struct ts_kmp *kmp;