From: Juan Quintela <quintela@redhat.com>
Date: Wed, 9 Oct 2013 10:30:35 +0000 (+0200)
Subject: memory: cpu_physical_memory_clear_dirty_range() now uses bitmap operations
X-Git-Tag: qemu-xen-4.5.0-rc1~264^2~11
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=a461e389f489e72cdc770ff887512c2c9109bc43;p=qemu-xen.git

memory: cpu_physical_memory_clear_dirty_range() now uses bitmap operations

We were clearing a range of bits, so use bitmap_clear().

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
---

diff --git a/include/exec/memory-internal.h b/include/exec/memory-internal.h
index 4906cdf0ea..e2f55eaeb1 100644
--- a/include/exec/memory-internal.h
+++ b/include/exec/memory-internal.h
@@ -95,14 +95,12 @@ static inline void cpu_physical_memory_clear_dirty_range(ram_addr_t start,
                                                          ram_addr_t length,
                                                          unsigned client)
 {
-    ram_addr_t addr, end;
+    unsigned long end, page;
 
     assert(client < DIRTY_MEMORY_NUM);
-    end = TARGET_PAGE_ALIGN(start + length);
-    start &= TARGET_PAGE_MASK;
-    for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
-        clear_bit(addr >> TARGET_PAGE_BITS, ram_list.dirty_memory[client]);
-    }
+    end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
+    page = start >> TARGET_PAGE_BITS;
+    bitmap_clear(ram_list.dirty_memory[client], page, end - page);
 }
 
 void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,