x86: Use absent_pages_in_range() instead of memblock_x86_hole_size()

memblock_x86_hole_size() calculates the total size of holes in a given
range according to memblock and is used by numa emulation code and
numa_meminfo_cover_memory().

Since conversion to MEMBLOCK_NODE_MAP, absent_pages_in_range() also
uses memblock and gives the same result.  This patch replaces
memblock_x86_hole_size() uses with absent_pages_in_range().  After the
conversion the x86 function doesn't have any user left and is killed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1310462166-31469-12-git-send-email-tj@kernel.org
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/include/asm/memblock.h b/arch/x86/include/asm/memblock.h
index a0cc7d6..17a882e 100644 (file)
--- a/arch/x86/include/asm/memblock.h
+++ b/arch/x86/include/asm/memblock.h
@@ -6,6 +6,4 @@
 void memblock_x86_reserve_range(u64 start, u64 end, char *name);
 void memblock_x86_free_range(u64 start, u64 end);
 
-u64 memblock_x86_hole_size(u64 start, u64 end);
-
 #endif

diff --git a/arch/x86/mm/memblock.c b/arch/x86/mm/memblock.c
index a9d0972..7325c5d 100644 (file)
--- a/arch/x86/mm/memblock.c
+++ b/arch/x86/mm/memblock.c
@@ -32,55 +32,3 @@ void __init memblock_x86_free_range(u64 start, u64 end)
 
        memblock_free(start, end - start);
 }
-
-/*
- * Finds an active region in the address range from start_pfn to last_pfn and
- * returns its range in ei_startpfn and ei_endpfn for the memblock entry.
- */
-static int __init memblock_x86_find_active_region(const struct memblock_region *ei,
-                                 unsigned long start_pfn,
-                                 unsigned long last_pfn,
-                                 unsigned long *ei_startpfn,
-                                 unsigned long *ei_endpfn)
-{
-       u64 align = PAGE_SIZE;
-
-       *ei_startpfn = round_up(ei->base, align) >> PAGE_SHIFT;
-       *ei_endpfn = round_down(ei->base + ei->size, align) >> PAGE_SHIFT;
-
-       /* Skip map entries smaller than a page */
-       if (*ei_startpfn >= *ei_endpfn)
-               return 0;
-
-       /* Skip if map is outside the node */
-       if (*ei_endpfn <= start_pfn || *ei_startpfn >= last_pfn)
-               return 0;
-
-       /* Check for overlaps */
-       if (*ei_startpfn < start_pfn)
-               *ei_startpfn = start_pfn;
-       if (*ei_endpfn > last_pfn)
-               *ei_endpfn = last_pfn;
-
-       return 1;
-}
-
-/*
- * Find the hole size (in bytes) in the memory range.
- * @start: starting address of the memory range to scan
- * @end: ending address of the memory range to scan
- */
-u64 __init memblock_x86_hole_size(u64 start, u64 end)
-{
-       unsigned long start_pfn = start >> PAGE_SHIFT;
-       unsigned long last_pfn = end >> PAGE_SHIFT;
-       unsigned long ei_startpfn, ei_endpfn, ram = 0;
-       struct memblock_region *r;
-
-       for_each_memblock(memory, r)
-               if (memblock_x86_find_active_region(r, start_pfn, last_pfn,
-                                          &ei_startpfn, &ei_endpfn))
-                       ram += ei_endpfn - ei_startpfn;
-
-       return end - start - ((u64)ram << PAGE_SHIFT);
-}

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index f4a40bd..88e5627 100644 (file)
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -475,8 +475,8 @@ static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
                        numaram = 0;
        }
 
-       e820ram = max_pfn - (memblock_x86_hole_size(0,
-                                       PFN_PHYS(max_pfn)) >> PAGE_SHIFT);
+       e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
+
        /* We seem to lose 3 pages somewhere. Allow 1M of slack. */
        if ((s64)(e820ram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
                printk(KERN_ERR "NUMA: nodes only cover %LuMB of your %LuMB e820 RAM. Not used.\n",

diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c
index e3d471c..971fe70 100644 (file)
--- a/arch/x86/mm/numa_emulation.c
+++ b/arch/x86/mm/numa_emulation.c
@@ -28,6 +28,16 @@ static int __init emu_find_memblk_by_nid(int nid, const struct numa_meminfo *mi)
        return -ENOENT;
 }
 
+static u64 mem_hole_size(u64 start, u64 end)
+{
+       unsigned long start_pfn = PFN_UP(start);
+       unsigned long end_pfn = PFN_DOWN(end);
+
+       if (start_pfn < end_pfn)
+               return PFN_PHYS(absent_pages_in_range(start_pfn, end_pfn));
+       return 0;
+}
+
 /*
  * Sets up nid to range from @start to @end.  The return value is -errno if
  * something went wrong, 0 otherwise.
@@ -89,7 +99,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
         * Calculate target node size.  x86_32 freaks on __udivdi3() so do
         * the division in ulong number of pages and convert back.
         */
-       size = max_addr - addr - memblock_x86_hole_size(addr, max_addr);
+       size = max_addr - addr - mem_hole_size(addr, max_addr);
        size = PFN_PHYS((unsigned long)(size >> PAGE_SHIFT) / nr_nodes);
 
        /*
@@ -135,8 +145,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
                         * Continue to add memory to this fake node if its
                         * non-reserved memory is less than the per-node size.
                         */
-                       while (end - start -
-                              memblock_x86_hole_size(start, end) < size) {
+                       while (end - start - mem_hole_size(start, end) < size) {
                                end += FAKE_NODE_MIN_SIZE;
                                if (end > limit) {
                                        end = limit;
@@ -150,7 +159,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
                         * this one must extend to the boundary.
                         */
                        if (end < dma32_end && dma32_end - end -
-                           memblock_x86_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
+                           mem_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
                                end = dma32_end;
 
                        /*
@@ -158,8 +167,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
                         * next node, this one must extend to the end of the
                         * physical node.
                         */
-                       if (limit - end -
-                           memblock_x86_hole_size(end, limit) < size)
+                       if (limit - end - mem_hole_size(end, limit) < size)
                                end = limit;
 
                        ret = emu_setup_memblk(ei, pi, nid++ % nr_nodes,
@@ -180,7 +188,7 @@ static u64 __init find_end_of_node(u64 start, u64 max_addr, u64 size)
 {
        u64 end = start + size;
 
-       while (end - start - memblock_x86_hole_size(start, end) < size) {
+       while (end - start - mem_hole_size(start, end) < size) {
                end += FAKE_NODE_MIN_SIZE;
                if (end > max_addr) {
                        end = max_addr;
@@ -211,8 +219,7 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
         * creates a uniform distribution of node sizes across the entire
         * machine (but not necessarily over physical nodes).
         */
-       min_size = (max_addr - addr - memblock_x86_hole_size(addr, max_addr)) /
-                                               MAX_NUMNODES;
+       min_size = (max_addr - addr - mem_hole_size(addr, max_addr)) / MAX_NUMNODES;
        min_size = max(min_size, FAKE_NODE_MIN_SIZE);
        if ((min_size & FAKE_NODE_MIN_HASH_MASK) < min_size)
                min_size = (min_size + FAKE_NODE_MIN_SIZE) &
@@ -252,7 +259,7 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
                         * this one must extend to the boundary.
                         */
                        if (end < dma32_end && dma32_end - end -
-                           memblock_x86_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
+                           mem_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
                                end = dma32_end;
 
                        /*
@@ -260,8 +267,7 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
                         * next node, this one must extend to the end of the
                         * physical node.
                         */
-                       if (limit - end -
-                           memblock_x86_hole_size(end, limit) < size)
+                       if (limit - end - mem_hole_size(end, limit) < size)
                                end = limit;
 
                        ret = emu_setup_memblk(ei, pi, nid++ % MAX_NUMNODES,