xfs: replace KM_LARGE with explicit vmalloc use

We use the KM_LARGE flag to make kmem_alloc and friends use vmalloc
if necessary.  As we only need this for a few boot/mount time
allocations just switch to explicit vmalloc calls there.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 20 insertions, 36 deletions

diff --git a/fs/xfs/linux-2.6/kmem.c b/fs/xfs/linux-2.6/kmem.c
index 2d3f90afe5f1..bc7405585def 100644
--- a/fs/xfs/linux-2.6/kmem.c
+++ b/fs/xfs/linux-2.6/kmem.c
@@ -16,7 +16,6 @@
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 #include <linux/mm.h>
-#include <linux/vmalloc.h>
 #include <linux/highmem.h>
 #include <linux/swap.h>
 #include <linux/blkdev.h>
@@ -24,8 +23,25 @@
 #include "time.h"
 #include "kmem.h"
 
-#define MAX_VMALLOCS    6
-#define MAX_SLAB_SIZE   0x20000
+/*
+ * Greedy allocation.  May fail and may return vmalloced memory.
+ *
+ * Must be freed using kmem_free_large.
+ */
+void *
+kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
+{
+        void            *ptr;
+        size_t          kmsize = maxsize;
+
+        while (!(ptr = kmem_zalloc_large(kmsize))) {
+                if ((kmsize >>= 1) <= minsize)
+                        kmsize = minsize;
+        }
+        if (ptr)
+                *size = kmsize;
+        return ptr;
+}
 
 void *
 kmem_alloc(size_t size, unsigned int __nocast flags)
@@ -34,19 +50,8 @@ kmem_alloc(size_t size, unsigned int __nocast flags)
         gfp_t   lflags = kmem_flags_convert(flags);
         void    *ptr;
 
-#ifdef DEBUG
-        if (unlikely(!(flags & KM_LARGE) && (size > PAGE_SIZE))) {
-                printk(KERN_WARNING "Large %s attempt, size=%ld\n",
-                        __func__, (long)size);
-                dump_stack();
-        }
-#endif
-
         do {
-                if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
-                        ptr = kmalloc(size, lflags);
-                else
-                        ptr = __vmalloc(size, lflags, PAGE_KERNEL);
+                ptr = kmalloc(size, lflags);
                 if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
                         return ptr;
                 if (!(++retries % 100))
@@ -68,27 +73,6 @@ kmem_zalloc(size_t size, unsigned int __nocast flags)
         return ptr;
 }
 
-void *
-kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize,
-                   unsigned int __nocast flags)
-{
-        void            *ptr;
-        size_t          kmsize = maxsize;
-        unsigned int    kmflags = (flags & ~KM_SLEEP) | KM_NOSLEEP;
-
-        while (!(ptr = kmem_zalloc(kmsize, kmflags))) {
-                if ((kmsize <= minsize) && (flags & KM_NOSLEEP))
-                        break;
-                if ((kmsize >>= 1) <= minsize) {
-                        kmsize = minsize;
-                        kmflags = flags;
-                }
-        }
-        if (ptr)
-                *size = kmsize;
-        return ptr;
-}
-
 void
 kmem_free(const void *ptr)
 {